Fixup unused vars/imports

.drone.yml

@@ -7,10 +7,6 @@ trigger:
   event:
     - tag
 
-platform:
-  os: linux
-  arch: arm64
-
 volumes:
   - name: cache
     temp: {}
@@ -27,7 +23,11 @@ steps:
         path: /drone/src/out
     commands:
       - cd /drone/src
-      - go build -o out/wifi cmd/wifi/wifi.go
+      - env GOOS=linux GOARCH=arm64 go build -o out/wifi cmd/wifi/wifi.go
+      - env GOOS=linux GOARCH=arm64 go build -o out/inotify cmd/inotify/inotify.go
+      - env GOOS=linux GOARCH=arm64 go build -o out/gui cmd/gui/gui.go
+      - env GOOS=linux GOARCH=arm64 go build -o out/fan cmd/fan/fan.go
+      - env GOOS=linux GOARCH=arm64 go build -o out/hdmi cmd/hdmi/hdmi.go
       - cp CHANGELOG.md out/
   - name: gitea-release
     image: plugins/gitea-release

CHANGELOG.md

@@ -1,5 +1,30 @@
 # Change Log
 
+## 20200906-1
+
+- Build bug fixes
+- Add HDMI on/off command for help with ensuring screen is on OR off at boot since systemd timers won't re-run on boot
+- Update tools to watch for config changes and restart if config has changed
+
+## 20200905-4
+
+- Update fan daemon to be better about loading config
+- Update slideshow to keep it running UNTIL a user presses a key to enter the config ui
+- Added support for slideshow restart interval (this is for re-randomizing the slideshow)
+- Adjust randomization flag for fim to be a little more reliable (put back the seeded version)
+- Adjusted config defaults and handling to be more reliable
+
+## 20200905-3
+
+- Update inotify to use configured path for albums instead of being hard coded
+
+## 20200827-1 through 20200905-2
+
+- Full bring up of main config UI
+- Additional 'advanced' configuration available via config file
+- Fan management daemon
+- inotify dameon for watching the main photos storage for changes and restarting slideshow as appropriate
+
 ## 20200826-1
 
 - Initial bring up of the wifi configuration utility

cmd/fan/README.md

@@ -0,0 +1,3 @@
+# Fan
+
+A simple utility to control the [Argon Fan](https://www.argon40.com/argon-fan-hat-for-raspberry-pi-4-raspberry-pi-3b-and-raspberry-pi-3-b.html) speed based on CPU/GPU temperatures.

cmd/fan/fan.go

@@ -0,0 +1,117 @@
+package main
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	argonFan "git.sungo.io/sungo/argon/fan"
+
+	"git.kemonine.info/PiFrame/config"
+	"git.kemonine.info/PiFrame/utils"
+)
+
+const (
+	BUS     = 1
+	ADDRESS = 0x1a
+)
+
+func main() {
+	// Load the config file
+	pfConfig, configFileProvider := config.LoadConfig(false)
+
+	// Watch for config changes and re-load config if needed
+	configFileProvider.Watch(func(event interface{}, err error) {
+		if err != nil {
+			log.Printf("Error setting up watch of config : %s", err)
+			return
+		}
+
+		// Bail on slideshow if there is a config change so it restarts with updated config
+		log.Fatalf("Config file changed! Exiting!")
+	})
+
+	// Get the various fan related config options as local variables
+	POLL_INTERVAL := pfConfig.String(config.CONFIG_KEY_FAN_POLL_INTERVAL)
+	SPEED_FULL_TEMP := pfConfig.Float64(config.CONFIG_KEY_FAN_SPEEDS + "." + config.CONFIG_MAP_KEY_FAN_SPEED_100)
+	SPEED_SEVENTY_FIVE_PERCENT_TEMP := pfConfig.Float64(config.CONFIG_KEY_FAN_SPEEDS + "." + config.CONFIG_MAP_KEY_FAN_SPEED_75)
+	SPEED_FIFTY_PERCENT_TEMP := pfConfig.Float64(config.CONFIG_KEY_FAN_SPEEDS + "." + config.CONFIG_MAP_KEY_FAN_SPEED_50)
+	SPEED_TWENTY_FIVE_PERCENT_TEMP := pfConfig.Float64(config.CONFIG_KEY_FAN_SPEEDS + "." + config.CONFIG_MAP_KEY_FAN_SPEED_25)
+	SPEED_MINIMUM := pfConfig.Int(config.CONFIG_KEY_FAN_MIN_SPEED)
+
+	// Setup fan and bail if we can't see it
+	fan, err := argonFan.New(ADDRESS, BUS)
+	if err != nil {
+		log.Fatalf("Error working with fan : %s", err)
+	}
+
+	// Safe exit
+	defer fan.SafeClose()
+	sigc := make(chan os.Signal, 1)
+	signal.Notify(
+		sigc,
+		syscall.SIGHUP,
+		syscall.SIGINT,
+		syscall.SIGTERM,
+		syscall.SIGQUIT,
+	)
+	go func() {
+		<-sigc
+		fan.SafeClose()
+		os.Exit(1)
+	}()
+
+	// Control fan speed based on temps via a ticker / timeout
+	pollInterval, err := time.ParseDuration(POLL_INTERVAL)
+	if err != nil {
+		log.Fatalf("Error parsing interval duration : %s", err)
+	}
+	ticker := time.NewTicker(pollInterval)
+	for range ticker.C {
+		cpuTemp := utils.GetCPUTemp()
+		gpuTemp := utils.GetGPUTemp()
+
+		if cpuTemp >= SPEED_FULL_TEMP || gpuTemp >= SPEED_FULL_TEMP {
+			if SPEED_MINIMUM > 100 {
+				fan.SetSpeed(SPEED_MINIMUM)
+			} else {
+				fan.SetSpeed(100)
+			}
+			continue
+		}
+		if cpuTemp >= SPEED_SEVENTY_FIVE_PERCENT_TEMP || gpuTemp >= SPEED_SEVENTY_FIVE_PERCENT_TEMP {
+			if SPEED_MINIMUM > 75 {
+				fan.SetSpeed(SPEED_MINIMUM)
+			} else {
+				fan.SetSpeed(75)
+			}
+			continue
+		}
+		if cpuTemp >= SPEED_FIFTY_PERCENT_TEMP || gpuTemp >= SPEED_FIFTY_PERCENT_TEMP {
+			if SPEED_MINIMUM > 50 {
+				fan.SetSpeed(SPEED_MINIMUM)
+			} else {
+				fan.SetSpeed(50)
+			}
+			continue
+		}
+		if cpuTemp >= SPEED_TWENTY_FIVE_PERCENT_TEMP || gpuTemp >= SPEED_TWENTY_FIVE_PERCENT_TEMP {
+			if SPEED_MINIMUM > 25 {
+				fan.SetSpeed(SPEED_MINIMUM)
+			} else {
+				fan.SetSpeed(25)
+			}
+			continue
+		}
+		if cpuTemp < SPEED_TWENTY_FIVE_PERCENT_TEMP || gpuTemp < SPEED_TWENTY_FIVE_PERCENT_TEMP {
+			fan.SetSpeed(SPEED_MINIMUM)
+			continue
+		}
+		// We should never get here but...
+		// Maxing fan to be on the safe side
+		log.Print("pf-fan : This should never happen")
+		fan.SetSpeed(100)
+	}
+}

cmd/gui/README.md

@@ -0,0 +1,38 @@
+# gui
+
+This is the main source code for the custom UI used by PiFrame. This is responsible for things like restart, WiFi config, ensuring the slide show is running and more.
+
+## Config
+
+The GUI uses a config similar to the following. To generate a default config, launch the gui and immediatly select the ```Save & Exit``` button. The generated configuration will be at ```/etc/default/pf.toml```.
+
+**Please Note**: The below is a sample and may or may not match the coded defaults. We also do *not* recommend changing values that are not present in the UI unless you are sure of the consequences.
+
+```
+
+config-ui-only = false
+
+[albums]
+  root = "/tank/pictures"
+  selected = ["/", "/KemoNine"]
+
+[fan]
+  minspeed = 10.0
+  pollinginterval = "30s"
+
+  [fan.speeds]
+    100 = 55.0
+    25 = 45.0
+    50 = 50.0
+    75 = 52.0
+
+[hdmi]
+  off = "*-*-* 00:00:00"
+  on = "*-*-* 06:00:00"
+
+[slideshow]
+  restartinterval = "168h"
+  slideinterval = "300s"
+
+
+```

cmd/gui/gui.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"github.com/knadh/koanf/providers/confmap"
+	"github.com/knadh/koanf/providers/posflag"
+	flag "github.com/spf13/pflag"
+
+	"git.kemonine.info/PiFrame/config"
+	"git.kemonine.info/PiFrame/ui"
+)
+
+func main() {
+	// Command line flag handler
+	f := flag.NewFlagSet("piframe", flag.ContinueOnError)
+	f.Usage = func() {
+		fmt.Println(f.FlagUsages())
+		os.Exit(0)
+	}
+	// Command line flags
+	f.Bool(config.CLI_FLAG_CONFIG_ONLY, false, "Only show the config UI, NOT the slideshow")
+	cliFlag := f.Lookup(config.CLI_FLAG_CONFIG_ONLY)
+	if cliFlag != nil {
+		cliFlag.NoOptDefVal = "true"
+	}
+	// Process command line flags into handler
+	f.Parse(os.Args[1:])
+
+	// Load the config file
+	pfConfig, configFileProvider := config.LoadConfig(false)
+
+	// Watch for config changes and re-load config if needed
+	configFileProvider.Watch(func(event interface{}, err error) {
+		if err != nil {
+			log.Printf("Error setting up watch of config : %s", err)
+			return
+		}
+
+		// Give the config UI a chance to save and exit clean
+		time.Sleep(time.Minute)
+
+		// Bail on slideshow if there is a config change so it restarts with updated config
+		log.Fatalf("Config file changed! Exiting!")
+	})
+
+	// Process command line flags
+	if err := pfConfig.Load(posflag.Provider(f, ".", pfConfig), nil); err != nil {
+		log.Fatalf("Error loading command line flags : %s", err)
+	}
+
+	hideSlideshow := pfConfig.Bool(config.CLI_FLAG_CONFIG_ONLY)
+
+	// Reset the CLI flag so it's never writted to the config as 'true'
+	pfConfig.Load(confmap.Provider(map[string]interface{}{
+		config.CLI_FLAG_CONFIG_ONLY: false,
+	}, "."), nil)
+
+	if !hideSlideshow {
+		ui.Slideshow(pfConfig)
+	}
+
+	ui.ConfigGui(pfConfig)
+}

cmd/hdmi/README.md

@@ -0,0 +1,3 @@
+# hdmi
+
+This is the source for the screen on/off tool. systemd timers are great but if the system auto-reboots overnight for update purposes the screen will remain on post-boot. This tool will ensure the screen turns back off if a PiFrame is rebooted during off hours.

cmd/hdmi/hdmi.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"log"
+	"os/exec"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.kemonine.info/PiFrame/config"
+)
+
+const (
+	CMD_VCGENCMD               = "/opt/vc/bin//vcgencmd"
+	CMD_VCGENCMD_DISPLAY_POWER = "display_power"
+)
+
+func main() {
+	// Load the config file
+	pfConfig, _ := config.LoadConfig(false)
+
+	// Read config values
+	hdmiOn := pfConfig.String(config.CONFIG_KEY_HDMI_ON)
+	hdmiOff := pfConfig.String(config.CONFIG_KEY_HDMI_OFF)
+
+	// Strip off systemd stuff we don't care about for this purpose
+	hdmiOn = strings.TrimLeft(hdmiOn, "*-*-* ")
+	hdmiOnSplit := strings.Split(hdmiOn, ":")
+
+	// Split the config into hours/minutes/seconds
+	hdmiOff = strings.TrimLeft(hdmiOff, "*-*-* ")
+	hdmiOffSplit := strings.Split(hdmiOff, ":")
+
+	// Parse hdmi on hours/minutes/seconds into ints so they can be used to create real date/time
+	hdmiOnHour, err := strconv.Atoi(hdmiOnSplit[0])
+	if err != nil {
+		log.Fatalf("Could not parse hdmi on hour : %s", err)
+	}
+	hdmiOnMinute, err := strconv.Atoi(hdmiOnSplit[1])
+	if err != nil {
+		log.Fatalf("Could not parse hdmi on minute : %s", err)
+	}
+	hdmiOnSecond, err := strconv.Atoi(hdmiOnSplit[2])
+	if err != nil {
+		log.Fatalf("Could not parse htmi on second : %s", err)
+	}
+
+	// Parse hdmi off hours/minutes/seconds into ints so they can be used to create real date/time
+	hdmiOffHour, err := strconv.Atoi(hdmiOffSplit[0])
+	if err != nil {
+		log.Fatalf("Could not parse hdmi off hour : %s", err)
+	}
+	hdmiOffMinute, err := strconv.Atoi(hdmiOffSplit[1])
+	if err != nil {
+		log.Fatalf("Could not parse hdmi off minute : %s", err)
+	}
+	hdmiOffSecond, err := strconv.Atoi(hdmiOffSplit[2])
+	if err != nil {
+		log.Fatalf("Could not parse hdmi off second : %s", err)
+	}
+
+	// Setup date/time vars for comparison
+	currentTime := time.Now()
+	hdmiOnTime := time.Date(currentTime.Year(), currentTime.Month(), currentTime.Day(), hdmiOnHour, hdmiOnMinute, hdmiOnSecond, 0, currentTime.Location())
+	hdmiOffTime := time.Date(currentTime.Year(), currentTime.Month(), currentTime.Day(), hdmiOffHour, hdmiOffMinute, hdmiOffSecond, 0, currentTime.Location())
+
+	// Turn on/off screen depending on current time
+	vcgencmdOnOffFlag := "-1"
+	if currentTime.After(hdmiOnTime) && currentTime.Before(hdmiOffTime) {
+		vcgencmdOnOffFlag = "1"
+	}
+	if currentTime.After(hdmiOffTime) && currentTime.Before(hdmiOnTime) {
+		vcgencmdOnOffFlag = "0"
+	}
+
+	hdmiControl := exec.Command(CMD_VCGENCMD, CMD_VCGENCMD_DISPLAY_POWER, vcgencmdOnOffFlag)
+	err = hdmiControl.Run()
+	if err != nil {
+		log.Fatalf("Error turning display on/off (%s) : %s", vcgencmdOnOffFlag, err)
+	}
+}

cmd/inotify/README.md

@@ -0,0 +1,3 @@
+# inotify
+
+This is the main source code for the inotify watcher that restarts the PiFrame slide show when files have changed (add/remove/etc).

cmd/inotify/inotify.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"log"
+	"os/exec"
+	"time"
+
+	"github.com/dietsche/rfsnotify"
+
+	"git.kemonine.info/PiFrame/config"
+	"git.kemonine.info/PiFrame/watchdog"
+)
+
+const (
+	CMD_SYSTEMCTL = "/usr/bin/systemctl"
+	TIMEOUT       = 5 * time.Second
+)
+
+func main() {
+	// Load the config file
+	pfConfig, configFileProvider := config.LoadConfig(false)
+
+	// Watch for config changes and re-load config if needed
+	configFileProvider.Watch(func(event interface{}, err error) {
+		if err != nil {
+			log.Printf("Error setting up watch of config : %s", err)
+			return
+		}
+
+		// Bail on slideshow if there is a config change so it restarts with updated config
+		log.Fatalf("Config file changed! Exiting!")
+	})
+
+	PATH_PICTURES := pfConfig.String(config.CONFIG_KEY_ALBUMS_ROOT)
+
+	// Create watchdog timer that restarts pf-ui.service on timeout
+	watchdog := watchdog.New(TIMEOUT, func() {
+		err := exec.Command(CMD_SYSTEMCTL, "restart", "pf-ui.service").Run()
+		if err != nil {
+			log.Fatalf("Error running %s : %s", CMD_SYSTEMCTL, err)
+		}
+	})
+	watchdog.DeferredStart()
+
+	// Create fswatcher
+	watcher, err := rfsnotify.NewWatcher()
+	if err != nil {
+		log.Fatal("Error setting up rfsnotify")
+	}
+
+	// Ensure we clean stuff up no matter what
+	defer watcher.Close()
+
+	// Setup goroutine and listen for events
+	done := make(chan bool)
+	go func() {
+		for {
+			select {
+			case _, ok := <-watcher.Events:
+				if !ok {
+					return
+				}
+				// [Re]Start timer to restart slideshow after the fs events die down
+				watchdog.Kick()
+			case err, ok := <-watcher.Errors:
+				if !ok {
+					return
+				}
+				log.Println("Error: ", err)
+			}
+		}
+	}()
+
+	// Setup paths to watch
+	err = watcher.AddRecursive(PATH_PICTURES)
+	if err != nil {
+		log.Fatalf("Error setting up recursive watch of %s", PATH_PICTURES)
+	}
+
+	// Drain done channel...
+	<-done
+}

cmd/ui/README.md

@@ -1,3 +0,0 @@
-# ui
-
-This is the main source code for the LCD UI device that's an optional component of the PiFrame project.

cmd/ui/ui.go

@@ -1,50 +0,0 @@
-package main
-
-import (
-	bh1750 "github.com/d2r2/go-bh1750"
-	i2c "github.com/d2r2/go-i2c"
-	logger "github.com/d2r2/go-logger"
-	"time"
-)
-
-var lg = logger.NewPackageLogger("main",
-	logger.ErrorLevel,
-)
-
-func main() {
-	defer logger.FinalizeLogger()
-
-	logger.ChangePackageLogLevel("i2c", logger.ErrorLevel)
-	logger.ChangePackageLogLevel("bh1750", logger.ErrorLevel)
-
-	// Create new connection to I2C to bh1750
-	i2c, err := i2c.NewI2C(0x23, 1)
-	if err != nil {
-		lg.Fatal(err)
-	}
-
-	// Free I2C connection on exit
-	defer i2c.Close()
-
-	// Setup sensor
-	sensor := bh1750.NewBH1750()
-
-	// Reset sensor prior to use
-	err = sensor.Reset(i2c)
-	if err != nil {
-		lg.Fatal(err)
-	}
-
-	// Read sensor value over time
-	for {
-		resolution := bh1750.HighResolution
-		lux, err := sensor.MeasureAmbientLight(i2c, resolution)
-		if err != nil {
-			lg.Fatal(err)
-		}
-
-		println("Illuminance:", lux, "lx")
-
-		time.Sleep(500 * time.Millisecond)
-	}
-}

cmd/wifi/wifi.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"os/exec"
 	"strings"
+
+	"git.kemonine.info/PiFrame/wifi"
 )
 
 // Various commands that we need for this process
@@ -13,7 +15,6 @@ const (
 	CMD_BLKID   = "/usr/sbin/blkid"
 	CMD_FINDMNT = "/usr/bin/findmnt"
 	CMD_MOUNT   = "/usr/bin/mount"
-	CMD_NMCLI   = "/usr/bin/nmcli"
 	CMD_UMOUNT  = "/usr/bin/umount"
 )
 
@@ -89,30 +90,11 @@ func main() {
 			// Doing stuff with the file contents goes here
 			essid := config[0]
 			password := config[1]
-			log.Printf("Using config: %s / %s for WiFi\n", essid, password)
-			// Cleanup existing WiFi connections
-			nmcliOut, err := exec.Command(CMD_NMCLI, "-t", "connection", "show").Output()
-			if err != nil {
-				log.Fatalf("Error running %s : %s", CMD_NMCLI, err)
-			}
-			connections := strings.Split(strings.Trim(string(nmcliOut), "\n"), "\n")
-			for _, connection := range connections {
-				details := strings.Split(connection, ":")
-				if details[2] != "802-11-wireless" {
-					continue
-				}
-				log.Printf("Cleaning up WiFi connection %s", details[0])
-				err := exec.Command(CMD_NMCLI, "connection", "del", details[1]).Run()
-				if err != nil {
-					log.Fatalf("Error running %s : %s", CMD_NMCLI, err)
-				}
-			}
-			// Create new WiFi connection with network manager
-			log.Printf("Connecting to %s with password %s\n", essid, password)
-			err = exec.Command(CMD_NMCLI, "d", "wifi", "connect", essid, "password", password).Run()
-			if err != nil {
-				log.Fatalf("Error running %s : %s", CMD_NMCLI, err)
-			}
+
+			// Cleanup old wifi configs and apply new one
+			nmWifi := wifi.New(essid, password)
+			nmWifi.ApplyConfig()
+
 			// Unmount the filesystem and continue
 			err = exec.Command(CMD_UMOUNT, MOUNTPOINT).Run()
 			if err != nil {

config/README.md

@@ -0,0 +1,3 @@
+# config
+
+Mini module for working with PiFrame configuration file.

config/config.go

@@ -0,0 +1,40 @@
+package config
+
+import (
+	"log"
+
+	"github.com/knadh/koanf"
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/confmap"
+	kfile "github.com/knadh/koanf/providers/file"
+)
+
+func LoadConfig(errFatalOnMissing bool) (*koanf.Koanf, *kfile.File) {
+	// Main config variable
+	var pfConfig = koanf.New(".")
+
+	// Setup defaults
+	pfConfig.Load(confmap.Provider(map[string]interface{}{
+		CONFIG_KEY_SLIDESHOW_INTERVAL:         DEFAULT_SLIDESHOW_INTERVAL,
+		CONFIG_KEY_SLIDESHOW_RESTART_INTERVAL: DEFAULT_SLIDESHOW_RESTART_INTERVAL,
+		CONFIG_KEY_HDMI_OFF:                   DEFAULT_HDMI_OFF,
+		CONFIG_KEY_HDMI_ON:                    DEFAULT_HDMI_ON,
+		CONFIG_KEY_ALBUMS_ROOT:                DEFAULT_ALBUMS_ROOT,
+		CONFIG_KEY_ALBUMS_SELECTED:            DEFAULT_ALBUM_SELECTED,
+		CONFIG_KEY_FAN_POLL_INTERVAL:          DEFAULT_FAN_POLL_INTERVAL,
+		CONFIG_KEY_FAN_SPEEDS:                 DEFAULT_FAN_SPEEDS,
+		CONFIG_KEY_FAN_MIN_SPEED:              DEFAULT_FAN_MIN_SPEED,
+	}, "."), nil)
+
+	// Bring in /etc/defaults/pf.toml if it exists
+	configFileProvider := kfile.Provider(CONFIG_FILE_PATH)
+	if err := pfConfig.Load(configFileProvider, toml.Parser()); err != nil {
+		if errFatalOnMissing {
+			log.Fatalf("Error loading config : %s", err)
+		} else {
+			log.Printf("Error loading config : %s", err)
+		}
+	}
+
+	return pfConfig, configFileProvider
+}

config/constants.go

@@ -0,0 +1,43 @@
+package config
+
+const (
+	CLI_FLAG_CONFIG_ONLY = "config-ui-only"
+)
+
+const (
+	CONFIG_FILE_PATH                      = "/etc/default/pf.toml"
+	CONFIG_FILE_PATH_TMP                  = "/etc/default/pf.toml.new"
+	CONFIG_KEY_SLIDESHOW_INTERVAL         = "slideshow.slideinterval"
+	CONFIG_KEY_SLIDESHOW_RESTART_INTERVAL = "slideshow.restartinterval"
+	CONFIG_KEY_HDMI_OFF                   = "hdmi.off"
+	CONFIG_KEY_HDMI_ON                    = "hdmi.on"
+	CONFIG_KEY_ALBUMS_ROOT                = "albums.root"
+	CONFIG_KEY_ALBUMS_SELECTED            = "albums.selected"
+	CONFIG_KEY_FAN_POLL_INTERVAL          = "fan.pollinginterval"
+	CONFIG_KEY_FAN_SPEEDS                 = "fan.speeds"
+	CONFIG_KEY_FAN_MIN_SPEED              = "fan.minspeed"
+	CONFIG_MAP_KEY_FAN_SPEED_25           = "25"
+	CONFIG_MAP_KEY_FAN_SPEED_50           = "50"
+	CONFIG_MAP_KEY_FAN_SPEED_75           = "75"
+	CONFIG_MAP_KEY_FAN_SPEED_100          = "100"
+)
+
+const (
+	DEFAULT_SLIDESHOW_INTERVAL         = "300s"
+	DEFAULT_SLIDESHOW_RESTART_INTERVAL = "168h"
+	DEFAULT_HDMI_OFF                   = "*-*-* 00:00:00"
+	DEFAULT_HDMI_ON                    = "*-*-* 06:00:00"
+	DEFAULT_ALBUMS_ROOT                = "/tank/pictures"
+	DEFAULT_FAN_POLL_INTERVAL          = "30s"
+	DEFAULT_FAN_MIN_SPEED              = 10
+)
+
+var DEFAULT_ALBUM_SELECTED = []string{"/"}
+
+// Speed : Temp to activate speed
+var DEFAULT_FAN_SPEEDS = map[string]float64{
+	CONFIG_MAP_KEY_FAN_SPEED_25:  45.00,
+	CONFIG_MAP_KEY_FAN_SPEED_50:  50.00,
+	CONFIG_MAP_KEY_FAN_SPEED_75:  52.00,
+	CONFIG_MAP_KEY_FAN_SPEED_100: 55.00,
+}

go.mod

@@ -1,13 +1,19 @@
-module kemonine.info/PiFrame
+module git.kemonine.info/PiFrame
 
 go 1.15
 
 require (
-	github.com/d2r2/go-bh1750 v0.0.0-20181222061755-1195122364ab
-	github.com/d2r2/go-i2c v0.0.0-20191123181816-73a8a799d6bc
-	github.com/d2r2/go-logger v0.0.0-20181221090742-9998a510495e
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	git.sungo.io/sungo/argon v0.0.0-20200904233623-18a98e1a4706
 	github.com/dietsche/rfsnotify v0.0.0-20200716145600-b37be6e4177f
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/eiannone/keyboard v0.0.0-20200508000154-caf4b762e807
+	github.com/gdamore/tcell v1.4.0
+	github.com/guillermo/go.procmeminfo v0.0.0-20131127224636-be4355a9fb0e
+	github.com/knadh/koanf v0.13.0
+	github.com/mitchellh/mapstructure v1.3.3 // indirect
+	github.com/pelletier/go-toml v1.8.1 // indirect
+	github.com/rivo/tview v0.0.0-20200915114512-42866ecf6ca6
+	github.com/spf13/pflag v1.0.5
+	golang.org/x/sys v0.0.0-20200918174421-af09f7315aff // indirect
+	golang.org/x/text v0.3.3 // indirect
 	gopkg.in/fsnotify.v1 v1.4.7 // indirect
 )

go.sum

@@ -1,16 +1,248 @@
-github.com/d2r2/go-bh1750 v0.0.0-20181222061755-1195122364ab h1:8zeQTn3owfeyIA5KIhtvcj9wlMStdFaxbYwPkWhGVgo=
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 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/ini.v1 v1.48.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

ui/README.md

@@ -0,0 +1,3 @@
+# ui
+
+This is the main implementation for various aspects of the main PiFrame [G]UI

ui/config.go

@@ -0,0 +1,595 @@
+package ui
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"math"
+	"net"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"text/template"
+
+	"github.com/gdamore/tcell"
+	"github.com/guillermo/go.procmeminfo"
+	"github.com/knadh/koanf"
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/confmap"
+	"github.com/rivo/tview"
+
+	"git.kemonine.info/PiFrame/config"
+	"git.kemonine.info/PiFrame/utils"
+	"git.kemonine.info/PiFrame/wifi"
+)
+
+const (
+	CMD_SYSTEMCTL         = "/usr/bin/systemctl"
+	CMD_FINDMNT           = "/usr/bin/findmnt"
+	SYNCTHING_FOLDER_SKIP = ".stfolder"
+)
+
+const (
+	PAGE_MAIN_UI   = "PAGE_MAIN_UI"
+	PAGE_SAVE_EXIT = "PAGE_SAVE_EXIT"
+	PAGE_EXIT      = "PAGE_EXIT"
+	PAGE_REBOOT    = "PAGE_REBOOT"
+	PAGE_POWEROFF  = "PAGE_POWEROFF"
+)
+
+// Bullshit to remove an element from a slice
+func remove(s []string, index int) []string {
+	return append(s[:index], s[index+1:]...)
+}
+
+// Housekeeping
+var app *tview.Application
+var main *tview.Flex
+var menu *tview.List
+
+// Function to reset the main input area that's used all over the place
+func resetMain() {
+	main.Clear()
+	app.SetFocus(menu)
+}
+
+func ConfigGui(pfconfig *koanf.Koanf) {
+	// Memory info for status panel
+	meminfo := &procmeminfo.MemInfo{}
+	err := meminfo.Update()
+	if err != nil {
+		log.Fatalf("Error getting memory info : %s", err)
+	}
+
+	// Network interfaces for status panel
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		log.Fatalf("Error getting netork interfaces : %s", err)
+		return
+	}
+
+	// Disk use
+	findmntOut, err := exec.Command(CMD_FINDMNT, "-n", "-l",
+		"-o", "TARGET,USE%",
+		"-t", "ext4,exfat,vfat,btrfs,zfs,xfs").Output()
+	if err != nil {
+		log.Fatalf("Error getting disk use : %s", err)
+	}
+	filesystems := strings.Split(strings.Trim(string(findmntOut), "\n"), "\n")
+
+	// GPU Temp
+	gpuTemp := fmt.Sprintf("%.2f'C", utils.GetGPUTemp())
+
+	// CPU Temp
+	cpuTemp := fmt.Sprintf("%.2f'C", utils.GetCPUTemp())
+
+	// Get list of all folders that can be used as albums
+	var albums []string
+	err = filepath.Walk(pfconfig.String(config.CONFIG_KEY_ALBUMS_ROOT), func(path string, fi os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if fi.IsDir() {
+			if strings.Contains(path, SYNCTHING_FOLDER_SKIP) {
+				return nil
+			}
+			albumName := strings.TrimPrefix(path, pfconfig.String(config.CONFIG_KEY_ALBUMS_ROOT))
+			if albumName == "" {
+				albumName = "Main Folder"
+			}
+			albums = append(albums, albumName)
+		}
+		return nil
+	})
+	if err != nil {
+		log.Fatalf("Error getting list of albums : %s", err)
+	}
+
+	// Run config UI when slideshow stops
+	app = tview.NewApplication()
+
+	// Header
+	headerTitle := tview.NewTextView().
+		SetText("PiFrame").
+		SetTextAlign(tview.AlignCenter).
+		SetTextColor(tcell.ColorAqua)
+
+	headerSubTitle := tview.NewTextView().
+		SetText("Management Utility").
+		SetTextAlign(tview.AlignCenter).
+		SetTextColor(tcell.ColorSilver)
+	header := tview.NewFlex().
+		SetDirection(tview.FlexRow)
+	header.AddItem(headerTitle, 0, 1, false).
+		AddItem(headerSubTitle, 0, 1, false)
+
+	// Footer fields (Left Column)
+	saveExitButton := tview.NewButton("Save & Exit").
+		SetBackgroundColorActivated(tcell.ColorGray)
+	saveExitButton.SetLabelColor(tcell.ColorBlack).
+		SetBorder(true).
+		SetBorderColor(tcell.ColorBlack).
+		SetBackgroundColor(tcell.ColorGreen).
+		SetRect(0, 0, 22, 3)
+
+	exitButton := tview.NewButton("Exit").
+		SetBackgroundColorActivated(tcell.ColorGray)
+	exitButton.SetLabelColor(tcell.ColorBlack).
+		SetBorder(true).
+		SetBorderColor(tcell.ColorBlack).
+		SetBackgroundColor(tcell.ColorYellow).
+		SetRect(0, 0, 22, 3)
+
+	rebootButton := tview.NewButton("Reboot").
+		SetBackgroundColorActivated(tcell.ColorGray)
+	rebootButton.SetLabelColor(tcell.ColorBlack).
+		SetBorder(true).
+		SetBorderColor(tcell.ColorBlack).
+		SetBackgroundColor(tcell.ColorFuchsia).
+		SetRect(0, 0, 22, 3)
+
+	powerOffButton := tview.NewButton("Power Off").
+		SetBackgroundColorActivated(tcell.ColorGray)
+	powerOffButton.SetLabelColor(tcell.ColorBlack).
+		SetBorder(true).
+		SetBorderColor(tcell.ColorBlack).
+		SetBackgroundColor(tcell.ColorRed).
+		SetRect(0, 0, 22, 3)
+
+	// Footer
+	footer := tview.NewFlex()
+	footer.AddItem(saveExitButton, 0, 1, false).
+		AddItem(exitButton, 0, 1, false).
+		AddItem(rebootButton, 0, 1, false).
+		AddItem(powerOffButton, 0, 1, false)
+	// Setup menu
+	menu = tview.NewList()
+	menu.SetBorder(true).
+		SetTitle("Menu").
+		SetTitleColor(tcell.ColorAqua)
+	menu.AddItem("Select Albums", "", '1', nil)
+	menu.AddItem("Intervals", "", '2', nil)
+	menu.AddItem("WiFi", "", '3', nil)
+	menu.AddItem("HDMI On/Off", "", '5', nil)
+	menu.AddItem("Advanced", "", '6', nil)
+
+	// Setup base var for main column so the menu setup is easier to manage
+	main = tview.NewFlex().
+		SetDirection(tview.FlexRow)
+
+	// Setup main panel (Center column)
+	main.SetTitle("").
+		SetBorder(true).
+		SetTitleColor(tcell.ColorAqua)
+
+	// Select Albums Form
+	selectAlbumsForm := tview.NewForm()
+	configSelectedAlbums := pfconfig.Strings(config.CONFIG_KEY_ALBUMS_SELECTED)
+	albumCheckboxes := []*tview.Checkbox{}
+	for _, album := range albums {
+		albumSelected := false
+		for _, configSelectedAlbum := range configSelectedAlbums {
+			if configSelectedAlbum == "/" {
+				configSelectedAlbum = "Main Folder"
+			}
+			if album == configSelectedAlbum {
+				albumSelected = true
+			}
+		}
+		albumCheckbox := tview.NewCheckbox()
+		albumCheckbox.SetLabel(album)
+		albumCheckbox.SetChecked(albumSelected)
+		albumCheckboxes = append(albumCheckboxes, albumCheckbox)
+		selectAlbumsForm.AddFormItem(albumCheckbox)
+	}
+	selectAlbumsForm.AddButton("Apply", resetMain)
+	selectAlbumsForm.AddButton("Cancel", resetMain)
+
+	// Slide Interval Form
+	intervalsForm := tview.NewForm()
+	configSlideInterval := pfconfig.String(config.CONFIG_KEY_SLIDESHOW_INTERVAL)
+	configRestartInterval := pfconfig.String(config.CONFIG_KEY_SLIDESHOW_RESTART_INTERVAL)
+	intervalsForm.AddInputField("Slide", configSlideInterval, 0, nil, func(value string) {
+		configSlideInterval = value
+	})
+	intervalsForm.AddInputField("Restart/Reshuffle", configRestartInterval, 0, nil, func(value string) {
+		configRestartInterval = value
+	})
+	intervalsForm.AddButton("Apply", resetMain)
+	intervalsForm.AddButton("Cancel", resetMain)
+
+	// WiFi Config Form
+	wifiConfigForm := tview.NewForm()
+	wifiConfigAccessPoint := ""
+	wifiConfigPassword := ""
+	wifiConfigForm.AddInputField("Access Point", "", 0, nil, func(value string) {
+		wifiConfigAccessPoint = value
+	})
+	wifiConfigForm.AddPasswordField("Password", "", 0, '*', func(value string) {
+		wifiConfigPassword = value
+	})
+	wifiConfigForm.AddButton("Apply", func() {
+		// Cleanup old wifi configs and apply new one
+		nmWifi := wifi.New(wifiConfigAccessPoint, wifiConfigPassword)
+		nmWifi.ApplyConfig()
+		resetMain()
+	})
+	wifiConfigForm.AddButton("Cancel", resetMain)
+
+	// HDMI On/Off Form
+	hdmiForm := tview.NewForm()
+	configHDMIOff := pfconfig.String(config.CONFIG_KEY_HDMI_OFF)
+	configHDMIOn := pfconfig.String(config.CONFIG_KEY_HDMI_ON)
+	hdmiForm.AddInputField("HDMI Off Schedule", configHDMIOff, 0, nil, func(value string) {
+		configHDMIOff = value
+	})
+	hdmiForm.AddInputField("HDMI On Schedule", configHDMIOn, 0, nil, func(value string) {
+		configHDMIOn = value
+	})
+	hdmiForm.AddButton("Apply", resetMain)
+	hdmiForm.AddButton("Cancel", resetMain)
+
+	// Advanced config form
+	advancedForm := tview.NewForm()
+	advancedForm.AddButton("Go Back", resetMain)
+
+	// Setup menu selection handler
+	menu.SetSelectedFunc(func(index int, title string, desc string, shortcut rune) {
+		if title == "Select Albums" {
+			main.SetTitle("Select Albums")
+			main.Clear()
+			main.AddItem(selectAlbumsForm, 0, 1, true)
+			app.SetFocus(selectAlbumsForm)
+		}
+		if title == "WiFi" {
+			main.SetTitle("Configure WiFi")
+			main.Clear()
+			main.AddItem(wifiConfigForm, 0, 1, true)
+			app.SetFocus(wifiConfigForm)
+		}
+		if title == "Intervals" {
+			main.SetTitle("Configure Intervals")
+			main.Clear()
+			main.AddItem(intervalsForm, 0, 1, true)
+			main.AddItem(tview.NewTextView().SetText("Intervals are a number + letter\n\nUse\ns for seconds\nm for minutes\nh for hours"), 0, 1, false)
+			app.SetFocus(intervalsForm)
+		}
+		if title == "HDMI On/Off" {
+			main.SetTitle("Configure HDMI On/Off")
+			main.Clear()
+			main.AddItem(hdmiForm, 0, 1, true)
+			main.AddItem(tview.NewTextView().SetText("These values are date+time combos\n\nPlease see https://www.freedesktop.org/software/systemd/man/systemd.time.html for details\n\nONLY adjust the times (24h format) if unsure of what to change"), 0, 1, false)
+			app.SetFocus(hdmiForm)
+		}
+		if title == "Advanced" {
+			main.SetTitle("Advanced Configuration")
+			main.Clear()
+			main.AddItem(tview.NewTextView().SetText("For advanced configuration edit /etc/default/pf.toml via the command line. There are a few config values that are DANGEROUS to adjust and not exposed through this ui."), 0, 1, false)
+			main.AddItem(advancedForm, 0, 1, false)
+			app.SetFocus(advancedForm)
+		}
+	})
+
+	// Side bar fields
+	sideBarCPUTempTitle := tview.NewTextView().
+		SetText("CPU Temperature").
+		SetTextColor(tcell.ColorYellow)
+	sideBarCPUTemp := tview.NewTextView().
+		SetText(fmt.Sprintf("  %s", cpuTemp))
+	sideBarGPUTempTitle := tview.NewTextView().
+		SetText("GPU Temperature").
+		SetTextColor(tcell.ColorYellow)
+	sideBarGPUTemp := tview.NewTextView().
+		SetText(fmt.Sprintf("  %s", gpuTemp))
+	sideBarMemoryTitle := tview.NewTextView().
+		SetText("Memory Use (Mb)").
+		SetTextColor(tcell.ColorYellow)
+	divisor := math.Pow(1024.0, 2.0)
+	sideBarMemoryStats := tview.NewTextView().
+		SetText(fmt.Sprintf("  %.1f / %.1f",
+			float64(meminfo.Used())/divisor,
+			float64(meminfo.Total())/divisor))
+	sideBarSwapTitle := tview.NewTextView().
+		SetText("Swap Use").
+		SetTextColor(tcell.ColorYellow)
+	sideBarSwapStats := tview.NewTextView().
+		SetText(fmt.Sprintf("  %d%%", meminfo.Swap()))
+	sideBarFilesystemTitle := tview.NewTextView().
+		SetText("Disk Use").
+		SetTextColor(tcell.ColorYellow)
+	var sideBarFilesystems []*tview.TextView
+	for _, i := range filesystems {
+		filesystemAsTextView := tview.NewTextView().
+			SetText(fmt.Sprintf("  %s", i))
+		sideBarFilesystems = append(sideBarFilesystems, filesystemAsTextView)
+	}
+	sideBarIPAddressesTitle := tview.NewTextView().
+		SetText("IP Addresses").
+		SetTextColor(tcell.ColorYellow)
+	var sideBarIPAddresses []*tview.TextView
+	for _, i := range ifaces {
+		addrs, err := i.Addrs()
+		if err != nil {
+			continue
+		}
+		for _, a := range addrs {
+			ipAsTextView := tview.NewTextView().
+				SetText(fmt.Sprintf("  %v : %s", i.Name, a.String()))
+			sideBarIPAddresses = append(sideBarIPAddresses, ipAsTextView)
+		}
+	}
+
+	// Setup side bar (Right column)
+	sideBar := tview.NewFlex().
+		SetDirection(tview.FlexRow)
+	sideBar.SetTitle("System Info").
+		SetBorder(true).
+		SetTitleColor(tcell.ColorAqua)
+	sideBar.AddItem(sideBarCPUTempTitle, 1, 1, false)
+	sideBar.AddItem(sideBarCPUTemp, 1, 1, false)
+	sideBar.AddItem(sideBarGPUTempTitle, 1, 1, false)
+	sideBar.AddItem(sideBarGPUTemp, 1, 1, false)
+	sideBar.AddItem(sideBarMemoryTitle, 1, 1, false)
+	sideBar.AddItem(sideBarMemoryStats, 1, 1, false)
+	sideBar.AddItem(sideBarSwapTitle, 1, 1, false)
+	sideBar.AddItem(sideBarSwapStats, 1, 1, false)
+	sideBar.AddItem(sideBarFilesystemTitle, 1, 1, false)
+	for _, filesystemAsTextView := range sideBarFilesystems {
+		sideBar.AddItem(filesystemAsTextView, 1, 1, false)
+	}
+	sideBar.AddItem(sideBarIPAddressesTitle, 1, 1, false)
+	for _, ipAsTextView := range sideBarIPAddresses {
+		sideBar.AddItem(ipAsTextView, 1, 1, false)
+	}
+
+	// Pages
+	pages := tview.NewPages()
+
+	// Main UI
+	mainUI := tview.NewGrid().
+		SetRows(2, 0, 4).
+		SetColumns(25, 50, 50).
+		SetBorders(true).
+		AddItem(header, 0, 0, 1, 3, 0, 0, false).
+		AddItem(footer, 2, 0, 1, 3, 0, 0, false)
+
+	mainUI.AddItem(menu, 1, 0, 1, 1, 0, 100, true).
+		AddItem(main, 1, 1, 1, 1, 0, 100, false).
+		AddItem(sideBar, 1, 2, 1, 1, 0, 100, false)
+
+	pages.AddPage(PAGE_MAIN_UI, mainUI, true, true)
+
+	// Button modals
+	saveExitModal := tview.NewModal().
+		SetText("Are you sure you want to [red]SAVE [red]& [red]EXIT?").
+		AddButtons([]string{"Yes", "Cancel"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Yes" {
+				// Deal with selected albums
+				for _, checkbox := range albumCheckboxes {
+					checkboxLabel := checkbox.GetLabel()
+					// Undo beautification of checkbox label
+					if checkboxLabel == "Main Folder" {
+						checkboxLabel = "/"
+					}
+					// Track whether or not we need to add OR remove from config
+					selected := checkbox.IsChecked()
+					inConfig := false
+					configIndex := 0
+
+					// Walk the existing config values and bail if/when we find the album
+					for configIndex = range configSelectedAlbums {
+						if checkboxLabel == configSelectedAlbums[configIndex] {
+							inConfig = true
+							break
+						}
+					}
+					// We need to add to the config
+					if selected && !inConfig {
+						configSelectedAlbums = append(configSelectedAlbums, checkboxLabel)
+					}
+					// We need to remove from the config
+					if !selected && inConfig {
+						configSelectedAlbums = remove(configSelectedAlbums, configIndex)
+					}
+				}
+
+				// Apply HDMI configuration (on/off)
+				var hdmiForDisk bytes.Buffer
+				valueForTemplate := utils.SystemdTimer{OnCalendar: configHDMIOn}
+				screenOn, err := template.New("screenon.systemd.timer").Parse(utils.SCREEN_ON_DOT_TIMER)
+				if err != nil {
+					log.Fatalf("Error setting up screen on systemd timer : %s", err)
+				}
+				err = screenOn.Execute(&hdmiForDisk, valueForTemplate)
+				if err != nil {
+					log.Fatalf("Error setting up screen on systemd timer : %s", err)
+				}
+				utils.WriteFile(utils.SCREEN_ON_TIMER_PATH, utils.SCREEN_ON_TIMER_PATH+".tmp", hdmiForDisk.Bytes())
+
+				valueForTemplate.OnCalendar = configHDMIOff
+				hdmiForDisk.Truncate(0)
+				screenOff, err := template.New("screenoff.systemd.timer").Parse(utils.SCREEN_OFF_DOT_TIMER)
+				if err != nil {
+					log.Fatalf("Error setting up screen off systemd timer : %s", err)
+				}
+				err = screenOff.Execute(&hdmiForDisk, valueForTemplate)
+				if err != nil {
+					log.Fatalf("Error setting up screen off systemd timer : %s", err)
+				}
+				utils.WriteFile(utils.SCREEN_OFF_TIMER_PATH, utils.SCREEN_OFF_TIMER_PATH+".tmp", hdmiForDisk.Bytes())
+
+				// Reload systemd units after applying HDMI config
+				utils.SystemdDaemonReload()
+
+				// Apply configuration updates to main config manager prior to saving
+				pfconfig.Load(confmap.Provider(map[string]interface{}{
+					config.CONFIG_KEY_SLIDESHOW_INTERVAL:         configSlideInterval,
+					config.CONFIG_KEY_SLIDESHOW_RESTART_INTERVAL: configRestartInterval,
+					config.CONFIG_KEY_HDMI_ON:                    configHDMIOn,
+					config.CONFIG_KEY_HDMI_OFF:                   configHDMIOff,
+					config.CONFIG_KEY_ALBUMS_SELECTED:            configSelectedAlbums,
+				}, "."), nil)
+
+				// Save configuration
+				parser := toml.Parser()
+				configForDisk, err := pfconfig.Marshal(parser)
+				if err != nil {
+					log.Fatalf("Error preparing config for disk write : %s", err)
+				}
+				utils.WriteFile(config.CONFIG_FILE_PATH, config.CONFIG_FILE_PATH_TMP, configForDisk)
+				app.Stop()
+				os.Exit(0)
+			}
+			pages.SwitchToPage(PAGE_MAIN_UI)
+		})
+	pages.AddPage(PAGE_SAVE_EXIT, saveExitModal, true, false)
+	saveExitButton.SetSelectedFunc(func() {
+		pages.ShowPage(PAGE_SAVE_EXIT)
+	})
+
+	exitModal := tview.NewModal().
+		SetText("Are you sure you want to [red]EXIT?").
+		AddButtons([]string{"Yes", "Cancel"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Yes" {
+				app.Stop()
+			}
+			pages.SwitchToPage(PAGE_MAIN_UI)
+		})
+	pages.AddPage(PAGE_EXIT, exitModal, true, false)
+	exitButton.SetSelectedFunc(func() {
+		pages.ShowPage(PAGE_EXIT)
+	})
+
+	rebootModal := tview.NewModal().
+		SetText("Are you sure you want to [red]REBOOT?").
+		AddButtons([]string{"Yes", "Cancel"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Yes" {
+				err := exec.Command(CMD_SYSTEMCTL, "reboot").Run()
+				if err != nil {
+					log.Fatalf("Could not reboot : %s ", err)
+				}
+			}
+			pages.SwitchToPage(PAGE_MAIN_UI)
+		})
+	pages.AddPage(PAGE_REBOOT, rebootModal, true, false)
+	rebootButton.SetSelectedFunc(func() {
+		pages.ShowPage(PAGE_REBOOT)
+	})
+
+	powerOffModal := tview.NewModal().
+		SetText("Are you sure you want to [red]POWER [red]OFF?").
+		AddButtons([]string{"Yes", "Cancel"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Yes" {
+				err := exec.Command(CMD_SYSTEMCTL, "poweroff").Run()
+				if err != nil {
+					log.Fatalf("Could not power off : %s ", err)
+				}
+			}
+			pages.SwitchToPage(PAGE_MAIN_UI)
+		})
+	pages.AddPage(PAGE_POWEROFF, powerOffModal, true, false)
+	powerOffButton.SetSelectedFunc(func() {
+		pages.ShowPage(PAGE_POWEROFF)
+	})
+
+	// Setup tracking of which are of the UI can/has focus
+	primitivesThatCanFocus := []tview.Primitive{menu, saveExitButton, exitButton, rebootButton, powerOffButton}
+	currentFocus := 0
+
+	// Setup basic switching between main menu and buttons for the UI
+	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		// Don't process input if we aren't on an existing element that can focus
+		canContinue := false
+		focusedPrimitive := app.GetFocus()
+
+		// Override some of the default behavior so up/dn move between fields in forms
+		//     Per API GetFocusedItemIndex on a form will be -1 if a form item isn't currently focused
+		//     We use this as a bit of a cheat to figure out if we're inside of a form that needs better nav options for users (ie. tab doesn't exist on a remote)
+		albumField, albumButton := selectAlbumsForm.GetFocusedItemIndex()
+		intervalField, intervalButton := intervalsForm.GetFocusedItemIndex()
+		wifiField, wifiButton := wifiConfigForm.GetFocusedItemIndex()
+		hdmiField, hdmiButton := hdmiForm.GetFocusedItemIndex()
+		advancedField, advancedButton := advancedForm.GetFocusedItemIndex()
+		if wifiField != -1 || wifiButton != -1 ||
+			albumField != -1 || albumButton != -1 ||
+			intervalField != -1 || intervalButton != -1 ||
+			hdmiField != -1 || hdmiButton != -1 ||
+			advancedField != -1 || advancedButton != -1 {
+			switch event.Key() {
+			case tcell.KeyUp:
+				return tcell.NewEventKey(tcell.KeyBacktab, 0, event.Modifiers())
+			case tcell.KeyDown:
+				return tcell.NewEventKey(tcell.KeyTab, 0, event.Modifiers())
+			}
+		}
+
+		// Standard override for the screen primitives we are using (ie. don't take over control in modals)
+		for _, primitive := range primitivesThatCanFocus {
+			if primitive == focusedPrimitive {
+				canContinue = true
+				break
+			}
+		}
+
+		// Bail if we shouldn't be affecting user input
+		if !canContinue {
+			return event
+		}
+
+		// Add various forms of nav that make sense for a TUI (common stuff folks are used to)
+		currentFocusChanged := false
+		switch event.Key() {
+		case tcell.KeyRight, tcell.KeyTab:
+			currentFocus += 1
+			if currentFocus >= len(primitivesThatCanFocus) {
+				currentFocus = 0
+			}
+			currentFocusChanged = true
+		case tcell.KeyLeft, tcell.KeyBacktab:
+			currentFocus -= 1
+			if currentFocus < 0 {
+				currentFocus = len(primitivesThatCanFocus) - 1
+			}
+			currentFocusChanged = true
+		}
+
+		// Update the focus based on navigation
+		if currentFocusChanged {
+			app.SetFocus(primitivesThatCanFocus[currentFocus])
+			return nil
+		}
+
+		// Pass through event so the main UI can process stuff properly
+		return event
+	})
+
+	// Show UI and panic if there are any errors
+	if err := app.SetRoot(pages, true).SetFocus(primitivesThatCanFocus[currentFocus]).EnableMouse(false).Run(); err != nil {
+		log.Fatalf("Failed to run UI : %s", err)
+	}
+}

ui/slideshow.go

@@ -0,0 +1,266 @@
+package ui
+
+import (
+	"context"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"syscall"
+	"time"
+
+	"github.com/eiannone/keyboard"
+	"github.com/knadh/koanf"
+
+	"git.kemonine.info/PiFrame/config"
+)
+
+const (
+	PATH_TEMP_FOR_SLIDESHOW = "/run/piframe/fim"
+)
+
+// fim placeholders so we can reset them as needed
+var fim *exec.Cmd = nil
+var stdin io.WriteCloser = nil
+
+func setupFim(PATH_TEMP_FOR_SLIDESHOW string) {
+	// Prep slideshow command and arguments
+	//     NOTE: The random flag is seeded with time() ; this is bad as we will be restarting the slideshow at about the same time per the configurd schedule
+	//           We use the non-seeded form to ensure that it's a little more random (or at least hope it's a little more random)
+	CMD_FIM := "/usr/bin/fim"
+	ARGS_FIM := []string{"--no-commandline", "--no-history", "--etc-fimrc", "/usr/local/etc/fimrc",
+		"--device", "/dev/fb0", "--vt", "1",
+		"--execute-commands-early", "\"clear\"", "--final-commands", "\"clear\"",
+		"--autozoom", "--random", "--recursive", "--cd-and-readdir",
+		PATH_TEMP_FOR_SLIDESHOW}
+
+	// fim command that'll be executed
+	fim = exec.Command(CMD_FIM, ARGS_FIM...)
+	// Put fim into a process group so ALL processes that may be executed are exited when main process exits
+	fim.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+
+	// Setup stdin for fim to control slideshow
+	stdinLocal, err := fim.StdinPipe()
+	if err != nil {
+		log.Fatalf("Error getting fim stdin : %s", err)
+	}
+	stdin = stdinLocal
+}
+
+func Slideshow(pfconfig *koanf.Koanf) {
+	// Prep folder setup needed for fim
+	//     fim does NOT allow multiple folders passed on the CLI (as far as KemoNine can tell)
+	//     We build a temp folder stup in /run/piframe/fim that has symlinks to selected albums
+	//     After we build up this directory setup we'll kick off fim against the temp dir with recursive
+	//     /run is a tmpfs so this won't wear on the sd card storage
+
+	// Create temp folder
+	_, err := os.Stat(PATH_TEMP_FOR_SLIDESHOW)
+	if os.IsNotExist(err) {
+		errDir := os.MkdirAll(PATH_TEMP_FOR_SLIDESHOW, 0755)
+		if errDir != nil {
+			log.Fatalf("Error setting up slideshow : %s", err)
+		}
+	}
+
+	// Cleanup temp folder if it already existed
+	dirRead, err := os.Open(PATH_TEMP_FOR_SLIDESHOW)
+	if err != nil {
+		log.Fatalf("Error setting up slideshow : %s", err)
+	}
+	dirFiles, err := dirRead.Readdir(0)
+	if err != nil {
+		log.Fatalf("Error setting up slideshow : %s", err)
+	}
+	// Loop over the directory's files.
+	for index := range dirFiles {
+		fileHere := dirFiles[index]
+
+		// Get name of file and its full path.
+		nameHere := fileHere.Name()
+		fullPath := PATH_TEMP_FOR_SLIDESHOW + "/" + nameHere
+
+		// Remove the file.
+		err = os.Remove(fullPath)
+		if err != nil {
+			log.Fatalf("Error setting up slideshow : %s", err)
+		}
+	}
+
+	// Setup symlinks to selected albums to be used with slideshow
+	// Add albums full paths to command line args for fim
+	albumRootPath := pfconfig.String(config.CONFIG_KEY_ALBUMS_ROOT)
+	for _, album := range pfconfig.Strings(config.CONFIG_KEY_ALBUMS_SELECTED) {
+		source := albumRootPath + album
+		destination := PATH_TEMP_FOR_SLIDESHOW + album
+		if album == "/" {
+			files, err := ioutil.ReadDir(albumRootPath)
+			if err != nil {
+				log.Fatalf("Error setting up slideshow : %s", err)
+			}
+
+			for _, file := range files {
+				filePath := albumRootPath + "/" + file.Name()
+				fileStat, err := os.Stat(filePath)
+				if err != nil {
+					log.Fatalf("Error setting up slideshow : %s", err)
+				}
+				mode := fileStat.Mode()
+				if mode.IsRegular() {
+					err = os.Symlink(filePath, PATH_TEMP_FOR_SLIDESHOW+"/"+file.Name())
+					if err != nil {
+						log.Fatalf("Error setting up slideshow : %s", err)
+					}
+				}
+			}
+			continue
+		}
+		err = os.Symlink(source, destination)
+		if err != nil {
+			log.Fatalf("Error setting up slideshow : %s", err)
+		}
+	}
+
+	// Setup fim for run
+	//     Commands can't be re-used so we move this to a function to support the restart interval cleanly
+	setupFim(PATH_TEMP_FOR_SLIDESHOW)
+
+	// Advance slideshow every interval as defined in const()
+	slideshowAdvanceDurationString := pfconfig.String(config.CONFIG_KEY_SLIDESHOW_INTERVAL)
+	slideshowAdvanceDuration, err := time.ParseDuration(slideshowAdvanceDurationString)
+	if err != nil {
+		log.Fatalf("Error parsing slide duration : %s", err)
+	}
+	ticker := time.NewTicker(slideshowAdvanceDuration)
+	stop_ticker := make(chan struct{})
+	go func() {
+		for {
+			select {
+			case <-ticker.C:
+				_, err = io.WriteString(stdin, "n")
+				if err != nil {
+					log.Fatalf("Error advancing slides : %s", err)
+				}
+			case <-stop_ticker:
+				ticker.Stop()
+				stdin.Close()
+				return
+			}
+		}
+	}()
+
+	// Start watching for key strokes and echo them back to stdout
+	keysEvents, err := keyboard.GetKeys(10)
+	if err != nil {
+		log.Fatalf("Error setting up keyboard listener : %s", err)
+	}
+	// NOT deferring keyboard.close as we do that by hand further down when fim exits ahead of showing the config UI
+
+	// Keep running fim until we're signaled by the user to do otherwise
+	// Common reasons that we MUST do this kind of goofy (bugs / behavior)
+	//     - fim doesn't quite see the /run changes where the albums are linked and bails out
+	//     - OOM kicks in and kills fim (it's kinda RAM heavy sometimes)
+	//     - Corrupt or invalid image causes fim to crash
+	//     - The timeout for re-randomizing kicked free and fim needs to restart
+	//     - fim thinks the slideshow has 'ended' for whatever reason and we really want to always show no matter what
+	STOP_SLIDESHOW := false
+
+	// Goroutine for tracking which keys are pressed and controlling fim if appropriate
+	keyboardCtx, keyboardCancel := context.WithCancel(context.Background())
+	go func(keyboardCtx context.Context) {
+		for {
+			select {
+			case <-keyboardCtx.Done():
+				return
+			case event := <-keysEvents:
+				if event.Err != nil {
+					log.Fatalf("Error listening to key events : %s", err)
+				}
+
+				// Keys for fim event management (previous/next in particular)
+				fimKey := ""
+				if event.Key == keyboard.KeyArrowLeft || event.Key == keyboard.KeyArrowDown {
+					fimKey = "p"
+				}
+				if event.Key == keyboard.KeyArrowRight || event.Key == keyboard.KeyArrowUp {
+					fimKey = "n"
+				}
+
+				// Exit fim and move to the config UI
+				if event.Key == keyboard.KeyEsc || event.Key == keyboard.KeyEnter || event.Key == keyboard.KeySpace {
+					// We are being told to stop the slideshow, oblidge the user
+					STOP_SLIDESHOW = true
+					if fim != nil { // Just in case someone lays on exit key or similar during startup
+						pgid, err := syscall.Getpgid(fim.Process.Pid)
+						if err == nil {
+							if err := syscall.Kill(-pgid, 9); err != nil {
+								log.Fatalf("failed to kill fim : %s", err)
+							}
+						}
+					}
+					break
+				}
+
+				// Control fim if we received a valid key for next/previous slide
+				if fimKey != "" {
+					_, err = io.WriteString(stdin, fimKey)
+					if err != nil {
+						log.Fatalf("Error controlling fim : %s", err)
+					}
+					ticker.Reset(pfconfig.Duration(config.CONFIG_KEY_SLIDESHOW_INTERVAL))
+				}
+			}
+		}
+	}(keyboardCtx)
+
+	// Restart fim after configured timeout ; This is setup as a ticker due to KemoNine not getting CommandWithContext stuff to work properly (lots of pointer related crashes and the like)
+	fimRestartDurationString := pfconfig.String(config.CONFIG_KEY_SLIDESHOW_RESTART_INTERVAL)
+	fimRestartDuration, err := time.ParseDuration(fimRestartDurationString)
+	if err != nil {
+		log.Fatalf("Error parsing restart duration : %S", err)
+	}
+	fimTicker := time.NewTicker(fimRestartDuration)
+	stop_fim_ticker := make(chan struct{})
+	go func() {
+		for {
+			select {
+			case <-fimTicker.C:
+				if fim != nil { // Just in case someone lays on exit key or similar during startup
+					pgid, err := syscall.Getpgid(fim.Process.Pid)
+					if err == nil {
+						if err := syscall.Kill(-pgid, 9); err != nil {
+							log.Fatalf("failed to kill fim : %s", err)
+						}
+					}
+				}
+			case <-stop_fim_ticker:
+				fimTicker.Stop()
+				return
+			}
+		}
+	}()
+
+	// Run fim
+	for !STOP_SLIDESHOW {
+		if err := fim.Run(); err != nil {
+			// Unwrap the error a bit so we can find out if a signal killed fim or something else
+			// An exit code of -1 means the program didn't exit in time or was terminated by a signal (per the docs)
+			if exitError, ok := err.(*exec.ExitError); ok && exitError.ExitCode() != -1 {
+				// We are NOT going to fatal here as there are many 'valid' reasons fim would exit for no good reason ;)
+				log.Printf("Error running fim : %s", err)
+			}
+		}
+		setupFim(PATH_TEMP_FOR_SLIDESHOW)
+	}
+
+	// Stop fim slideshow advancing go routine
+	close(stop_ticker)
+	// Stop restart go routine
+	close(stop_fim_ticker)
+
+	// Stop listening to keyboard events
+	keyboard.Close()
+	keyboardCancel()
+
+}

utils/README.md

@@ -0,0 +1,3 @@
+# Utils
+
+Misc utilities used elsewhere by PiFrame go code.

utils/files.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+)
+
+func WriteFile(destinationPath string, tempPath string, dataForDisk []byte) {
+	if err := ioutil.WriteFile(tempPath, dataForDisk, 0644); err != nil {
+		log.Fatalf("Error writing temp file : %s", err)
+	}
+	if err := os.Rename(tempPath, destinationPath); err != nil {
+		log.Fatalf("Error moving new in place : %s", err)
+	}
+}

utils/hdmi.go

@@ -0,0 +1,28 @@
+package utils
+
+type SystemdTimer struct {
+	OnCalendar string
+}
+
+const SCREEN_ON_DOT_TIMER = `
+[Unit]
+Description=Turn on display
+
+[Timer]
+OnCalendar={{.OnCalendar}}
+Persistent=true
+
+[Install]
+WantedBy=timers.target
+`
+const SCREEN_OFF_DOT_TIMER = `
+[Unit]
+Description=Turn off display
+
+[Timer]
+OnCalendar={{.OnCalendar}}
+Persistent=true
+
+[Install]
+WantedBy=timers.target
+`

utils/systemd.go

@@ -0,0 +1,23 @@
+package utils
+
+import (
+	"log"
+	"os/exec"
+)
+
+const (
+	CMD_SYSTEMCTL = "/usr/bin/systemctl"
+)
+
+const (
+	SCREEN_ON_TIMER_PATH  = "/etc/systemd/system/screen-on.timer"
+	SCREEN_OFF_TIMER_PATH = "/etc/systemd/system/screen-off.timer"
+)
+
+func SystemdDaemonReload() {
+	// Reload systemd units
+	err := exec.Command(CMD_SYSTEMCTL, "daemon-reload").Run()
+	if err != nil {
+		log.Fatalf("Error running %s : %s", CMD_SYSTEMCTL, err)
+	}
+}

utils/temperature.go

@@ -0,0 +1,41 @@
+package utils
+
+import (
+	"io/ioutil"
+	"log"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+const (
+	CMD_VCGENCMD  = "/opt/vc/bin/vcgencmd"
+	FILE_CPU_TEMP = "/sys/class/thermal/thermal_zone0/temp"
+)
+
+func GetCPUTemp() float64 {
+	cpuTempFileContents, err := ioutil.ReadFile(FILE_CPU_TEMP)
+	if err != nil {
+		log.Fatalf("Error getting CPU temp : %s", err)
+	}
+	cpuTempStr := strings.Trim(string(cpuTempFileContents), "\n")
+	cpuTempInt, err := strconv.Atoi(cpuTempStr)
+	if err != nil {
+		log.Fatalf("Error processing CPU temp : %S", err)
+	}
+	return float64(cpuTempInt) / 1000.0
+}
+
+func GetGPUTemp() float64 {
+	vcgencmdOut, err := exec.Command(CMD_VCGENCMD, "measure_temp").Output()
+	if err != nil {
+		log.Fatalf("Error getting GPU temp : %s", err)
+	}
+	gpuTempString := strings.Split(strings.Trim(string(vcgencmdOut), "\n"), "=")[1]
+	gpuTempString = strings.Trim(gpuTempString, "'C")
+	gpuTemp, err := strconv.ParseFloat(gpuTempString, 64)
+	if err != nil {
+		log.Fatalf("Error parsing GPU Temp : %s", err)
+	}
+	return gpuTemp
+}

vendor/git.sungo.io/sungo/argon/LICENSE.md

@@ -0,0 +1,5 @@
+Software originally developed by sungo (https://sungo.io)
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

vendor/git.sungo.io/sungo/argon/fan/main.go

@@ -0,0 +1,58 @@
+package fan
+
+// Code originally developed by sungo (https://sungo.io)
+// Distributed under the terms of the 0BSD license https://opensource.org/licenses/0BSD
+
+import (
+	"github.com/d2r2/go-i2c"
+	"github.com/d2r2/go-logger"
+)
+
+type Fan struct {
+	conn *i2c.I2C
+}
+
+func init() {
+	logger.ChangePackageLogLevel("i2c", logger.PanicLevel)
+}
+
+// From the argon python script:
+// On an rpi4, the bus should be 1
+// On any other rpi, the bus should 0
+// On all platforms, the address should be 0x1a
+func New(address uint8, bus int) (*Fan, error) {
+	f := &Fan{}
+
+	i, err := i2c.NewI2C(address, bus)
+	f.conn = i
+
+	return f, err
+}
+
+func (f *Fan) Bus() int {
+	return f.conn.GetBus()
+}
+
+func (f *Fan) Addr() uint8 {
+	return f.conn.GetAddr()
+}
+
+func (f *Fan) SafeClose() error {
+	f.SetSpeed(50)
+	return f.Close()
+}
+
+func (f *Fan) Close() error {
+	return f.conn.Close()
+}
+
+func (f *Fan) SetSpeed(percent int) error {
+	if percent > 100 {
+		percent = 100
+	} else if percent < 0 {
+		percent = 0
+	}
+
+	_, err := f.conn.WriteBytes([]byte(string(percent)))
+	return err
+}

vendor/github.com/d2r2/go-bh1750/.travis.yml

@@ -1,25 +0,0 @@
-language: go
-go:
-#  - "1.10"
-  - "tip"
-
-# first part of the GOARCH workaround
-# setting the GOARCH directly doesn't work, since the value will be overwritten later
-# so set it to a temporary environment variable first
-env:
-  global:
-    TRAVIS_CGO_ENABLED=1
-    TRAVIS_GOOS=linux
-  matrix:
-    - TRAVIS_GOARCH=amd64
-    - TRAVIS_GOARCH=arm TRAVIS_CC=arm-linux-gnueabi-gcc TRAVIS_GOARM=6
-
-# second part of the GOARCH workaround
-# now actually set the GOARCH env variable to the value of the temporary variable set earlier
-before_install:
-  - sudo apt-get install gcc-arm-linux-gnueabi # for CGO cross compile to ARM
-  - export CGO_ENABLED=$TRAVIS_CGO_ENABLED GOARCH=$TRAVIS_GOARCH GOARM=$TRAVIS_GOARM GOOS=$TRAVIS_GOOS CC=$TRAVIS_CC
-  - go env # for debugging
-  - go tool dist env # for debugging
-  
-  

vendor/github.com/d2r2/go-bh1750/README.md

@@ -1,91 +0,0 @@
-
-BH1750 ambient light sensor
-=====================
-
-[![Build Status](https://travis-ci.org/d2r2/go-bh1750.svg?branch=master)](https://travis-ci.org/d2r2/go-bh1750)
-[![Go Report Card](https://goreportcard.com/badge/github.com/d2r2/go-bh1750)](https://goreportcard.com/report/github.com/d2r2/go-bh1750)
-[![GoDoc](https://godoc.org/github.com/d2r2/go-bh1750?status.svg)](https://godoc.org/github.com/d2r2/go-bh1750)
-[![MIT License](http://img.shields.io/badge/License-MIT-yellow.svg)](./LICENSE)
-
-BH1750 ([general specification](https://raw.github.com/d2r2/go-bh1750/master/docs/bh1750fvi-e-186247.pdf)) is a power effective ambient light sensor with spectral response close to human eye. Sensor returns measured ambient light value in lux units. Easily integrated with Arduino and Raspberry PI via i2c communication interface:
-![image](https://raw.github.com/d2r2/go-bh1750/master/docs/bh1750.jpg)
-
-Here is a library written in [Go programming language](https://golang.org/) for Raspberry PI and counterparts, which gives you in the output ambient light value (making all necessary i2c-bus interacting and values computing).
-
-Golang usage
-------------
-
-
-```go
-func main() {
-	// Create new connection to i2c-bus on 0 line with address 0x23.
-	// Use i2cdetect utility to find device address over the i2c-bus
-	i2c, err := i2c.NewI2C(0x23, 0)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer i2c.Close()
-
-	sensor := bh1750.NewBH1750()
-
-	resolution := bh1750.HighResolution
-	amb, err := sensor.MeasureAmbientLight(i2c, resolution)
-	if err != nil {
-		lg.Fatal(err)
-	}
-	log.Printf("Ambient light (%s) = %v lx", resolution, amb)
-```
-
-
-Getting help
-------------
-
-GoDoc [documentation](http://godoc.org/github.com/d2r2/go-bh1750)
-
-Installation
-------------
-
-```bash
-$ go get -u github.com/d2r2/go-bh1750
-```
-
-Troubleshooting
---------------
-
-- *How to obtain fresh Golang installation to RPi device (either any RPi clone):*
-If your RaspberryPI golang installation taken by default from repository is outdated, you may consider
-to install actual golang manually from official Golang [site](https://golang.org/dl/). Download
-tar.gz file containing armv6l in the name. Follow installation instructions.
-
-- *How to enable I2C bus on RPi device:*
-If you employ RaspberryPI, use raspi-config utility to activate i2c-bus on the OS level.
-Go to "Interfacing Options" menu, to active I2C bus.
-Probably you will need to reboot to load i2c kernel module.
-Finally you should have device like /dev/i2c-1 present in the system.
-
-- *How to find I2C bus allocation and device address:*
-Use i2cdetect utility in format "i2cdetect -y X", where X may vary from 0 to 5 or more,
-to discover address occupied by peripheral device. To install utility you should run
-`apt install i2c-tools` on debian-kind system. `i2cdetect -y 1` sample output:
-	```
-	     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
-	00:          -- -- -- -- -- -- -- -- -- -- -- -- --
-	10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-	20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-	30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-	40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-	50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-	60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-	70: -- -- -- -- -- -- 76 --    
-	```
-
-Contact
--------
-
-Please use [Github issue tracker](https://github.com/d2r2/go-bh1750/issues) for filing bugs or feature requests.
-
-
-License
--------
-
-Go-bh1750 is licensed under MIT License.

vendor/github.com/d2r2/go-bh1750/bh1750.go

@@ -1,323 +0,0 @@
-//--------------------------------------------------------------------------------------------------
-//
-// Copyright (c) 2018 Denis Dyakov
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
-// associated documentation files (the "Software"), to deal in the Software without restriction,
-// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
-// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
-// subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in all copies or substantial
-// portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
-// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-//
-//--------------------------------------------------------------------------------------------------
-
-package bh1750
-
-import (
-	"encoding/binary"
-	"errors"
-	"time"
-
-	i2c "github.com/d2r2/go-i2c"
-	"github.com/davecgh/go-spew/spew"
-)
-
-// Command bytes
-const (
-	// No active state.
-	CMD_POWER_DOWN = 0x00
-
-	// Waiting for measurement command.
-	CMD_POWER_ON = 0x01
-
-	// Reset Data register value.
-	// Reset command is not acceptable in Power Down mode.
-	CMD_RESET = 0x07
-
-	// Start measurement at 1lx resolution.
-	// Measurement Time is typically 120ms.
-	CMD_CONTINUOUSLY_H_RES_MODE = 0x10
-
-	// Start measurement at 0.5lx resolution.
-	// Measurement Time is typically 120ms.
-	CMD_CONTINUOUSLY_H_RES_MODE2 = 0x11
-
-	// Start measurement at 4lx resolution.
-	// Measurement Time is typically 16ms.
-	CMD_CONTINUOUSLY_L_RES_MODE = 0x13
-
-	// Start measurement at 1lx resolution.
-	// Measurement Time is typically 120ms.
-	// It is automatically set to Power Down mode after measurement
-	CMD_ONE_TIME_H_RES_MODE = 0x20
-
-	// Start measurement at 0.5lx resolution.
-	// Measurement Time is typically 120ms.
-	// It is automatically set to Power Down mode after measurement.
-	CMD_ONE_TIME_H_RES_MODE2 = 0x21
-
-	// Start measurement at 4lx resolution.
-	// Measurement Time is typically 16ms.
-	// It is automatically set to Power Down mode after measurement.
-	CMD_ONE_TIME_L_RES_MODE = 0x23
-
-	// Change measurement time. 01000_MT[7,6,5]
-	CMD_CHANGE_MEAS_TIME_HIGH = 0x40
-
-	// Change measurement time. 011_MT[4,3,2,1,0]
-	CMD_CHANGE_MEAS_TIME_LOW = 0x60
-)
-
-// ResolutionMode define sensor sensitivity
-// and measure time. Be aware, that improving
-// sensitivity lead to increasing of measurement time.
-type ResolutionMode int
-
-const (
-	// LowResolution precision 4 lx, 16 ms measurement time
-	LowResolution ResolutionMode = iota + 1
-	// HighResolution precision 1 lx, 120 ms measurement time
-	HighResolution
-	// HighestResolution precision 0.5 lx, 120 ms measurement time
-	HighestResolution
-)
-
-// String define stringer interface.
-func (v ResolutionMode) String() string {
-	switch v {
-	case LowResolution:
-		return "Low Resolution"
-	case HighResolution:
-		return "High Resolution"
-	case HighestResolution:
-		return "Highest Resolution"
-	default:
-		return "<unknown>"
-	}
-}
-
-// BH1750 it's a sensor itself.
-type BH1750 struct {
-	// Since sensor have no register
-	// to report current state, we save
-	// last issued command to fill this gap.
-	lastCmd        byte
-	lastResolution ResolutionMode
-	factor         byte
-}
-
-// NewBH1750 return new sensor instance.
-func NewBH1750() *BH1750 {
-	v := &BH1750{}
-	v.factor = v.GetDefaultSensivityFactor()
-	return v
-}
-
-// Reset clear ambient light register value.
-func (v *BH1750) Reset(i2c *i2c.I2C) error {
-	lg.Debug("Reset sensor...")
-	_, err := i2c.WriteBytes([]byte{CMD_RESET})
-	if err != nil {
-		return err
-	}
-	v.lastCmd = CMD_RESET
-	time.Sleep(time.Microsecond * 3)
-	return nil
-}
-
-// PowerDown return register to idle state.
-func (v *BH1750) PowerDown(i2c *i2c.I2C) error {
-	lg.Debug("Power down sensor...")
-	_, err := i2c.WriteBytes([]byte{CMD_POWER_DOWN})
-	if err != nil {
-		return err
-	}
-	v.lastCmd = CMD_POWER_DOWN
-	return nil
-}
-
-// PowerOn activate sensor.
-func (v *BH1750) PowerOn(i2c *i2c.I2C) error {
-	lg.Debug("Power on sensor...")
-	_, err := i2c.WriteBytes([]byte{CMD_POWER_ON})
-	if err != nil {
-		return err
-	}
-	v.lastCmd = CMD_POWER_ON
-	return nil
-}
-
-// Get internal parameters used to program sensor.
-func (v *BH1750) getResolutionData(resolution ResolutionMode) (cmd byte,
-	wait time.Duration, divider uint32) {
-
-	switch resolution {
-	case LowResolution:
-		cmd = CMD_ONE_TIME_L_RES_MODE
-		divider = 1
-		// typical measure time is 16 ms,
-		// but as it was found 24 ms max time
-		// gives better results
-		wait = time.Millisecond * 24
-	case HighResolution:
-		cmd = CMD_ONE_TIME_H_RES_MODE
-		divider = 1
-		// typical measure time
-		wait = time.Millisecond * 120
-	case HighestResolution:
-		cmd = CMD_ONE_TIME_H_RES_MODE2
-		divider = 2
-		// typical measure time
-		wait = time.Millisecond * 120
-	}
-	wait = wait * time.Duration(v.factor) /
-		time.Duration(v.GetDefaultSensivityFactor())
-
-	return cmd, wait, divider
-}
-
-// MeasureAmbientLight measure and return ambient light once in lux.
-func (v *BH1750) MeasureAmbientLight(i2c *i2c.I2C,
-	resolution ResolutionMode) (uint16, error) {
-
-	lg.Debug("Run one time measure...")
-
-	cmd, wait, divider := v.getResolutionData(resolution)
-
-	v.lastCmd = cmd
-	v.lastResolution = resolution
-
-	_, err := i2c.WriteBytes([]byte{cmd})
-	if err != nil {
-		return 0, err
-	}
-
-	time.Sleep(wait)
-
-	var data struct {
-		Data [2]byte
-	}
-	err = readDataToStruct(i2c, 2, binary.BigEndian, &data)
-	if err != nil {
-		return 0, err
-	}
-
-	amb := uint16(uint32(uint16(data.Data[0])<<8|uint16(data.Data[1])) *
-		5 / 6 / divider)
-
-	return amb, nil
-}
-
-// StartMeasureAmbientLightContinuously start continuous
-// measurement process. Use FetchMeasuredAmbientLight to get
-// average ambient light amount collected and calculated over a time.
-// Use PowerDown to stop measurements and return sensor to idle state.
-func (v *BH1750) StartMeasureAmbientLightContinuously(i2c *i2c.I2C,
-	resolution ResolutionMode) (wait time.Duration, err error) {
-
-	lg.Debug("Start measures continuously...")
-
-	cmd, wait, _ := v.getResolutionData(resolution)
-
-	v.lastCmd = cmd
-	v.lastResolution = resolution
-
-	_, err = i2c.WriteBytes([]byte{cmd})
-	if err != nil {
-		return 0, err
-	}
-
-	// Wait first time to collect necessary
-	// amount of light for correct results.
-	// It's not necessary to wait next time
-	// same amount of time, because
-	// sensor accumulate average lux amount
-	// without any overwrite old value.
-	time.Sleep(wait)
-
-	// In any case we are returning same
-	// recommended amount of time to wait
-	// between measures.
-	return wait, nil
-}
-
-// FetchMeasuredAmbientLight return current average ambient light in lux.
-// Previous command should be any continuous measurement initiation,
-// otherwise error will be reported.
-func (v *BH1750) FetchMeasuredAmbientLight(i2c *i2c.I2C) (uint16, error) {
-
-	lg.Debug("Fetch measured data...")
-
-	cmd, _, divider := v.getResolutionData(v.lastResolution)
-
-	if v.lastCmd != cmd {
-		return 0, errors.New(
-			"can't fetch measured ambient light, since last command doesn't match")
-	}
-
-	var data struct {
-		Data [2]byte
-	}
-	err := readDataToStruct(i2c, 2, binary.BigEndian, &data)
-	if err != nil {
-		return 0, err
-	}
-
-	amb := uint16(uint32(uint16(data.Data[0])<<8|uint16(data.Data[1])) *
-		5 / 6 / divider)
-
-	return amb, nil
-}
-
-// GetDefaultSensivityFactor return factor value
-// used when your sensor have no any protection cover.
-// This is default setting according to specification.
-func (v *BH1750) GetDefaultSensivityFactor() byte {
-	return 69
-}
-
-// ChangeSensivityFactor used when you close sensor
-// with protection cover, which change (ordinary decrease)
-// expected amount of light falling on the sensor.
-// In this case you should calibrate you sensor and find
-// appropriate factor to get in output correct ambient light value.
-// Be aware, that improving sensitivity will increase
-// measurement time.
-func (v *BH1750) ChangeSensivityFactor(i2c *i2c.I2C, factor byte) error {
-
-	lg.Debug("Change sensitivity factor...")
-
-	// minimum limit
-	const minValue = 31
-	// maximum limit
-	const maxValue = 254
-
-	if factor < minValue || factor > maxValue {
-		return errors.New(spew.Sprintf("sensitivity factor value exceed range [%d..%d]",
-			minValue, maxValue))
-	}
-
-	high := (factor & 0xE0) >> 5
-	_, err := i2c.WriteBytes([]byte{CMD_CHANGE_MEAS_TIME_HIGH | high})
-	if err != nil {
-		return err
-	}
-
-	low := (factor & 0x1F)
-	_, err = i2c.WriteBytes([]byte{CMD_CHANGE_MEAS_TIME_LOW | low})
-	if err != nil {
-		return err
-	}
-
-	v.factor = factor
-
-	return nil
-}

vendor/github.com/d2r2/go-bh1750/logger.go

@@ -1,10 +0,0 @@
-package bh1750
-
-import logger "github.com/d2r2/go-logger"
-
-// You can manage verbosity of log output
-// in the package by changing last parameter value.
-var lg = logger.NewPackageLogger("bh1750",
-	logger.DebugLevel,
-	// logger.InfoLevel,
-)

vendor/github.com/d2r2/go-bh1750/utils.go

@@ -1,106 +0,0 @@
-//--------------------------------------------------------------------------------------------------
-//
-// Copyright (c) 2018 Denis Dyakov
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
-// associated documentation files (the "Software"), to deal in the Software without restriction,
-// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
-// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
-// subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in all copies or substantial
-// portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
-// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-//
-//--------------------------------------------------------------------------------------------------
-
-package bh1750
-
-import (
-	"bytes"
-	"encoding/binary"
-	"math"
-
-	i2c "github.com/d2r2/go-i2c"
-)
-
-// Utility functions
-
-// getS16BE extract 2-byte integer as signed big-endian.
-func getS16BE(buf []byte) int16 {
-	v := int16(buf[0])<<8 + int16(buf[1])
-	return v
-}
-
-// getS16LE extract 2-byte integer as signed little-endian.
-func getS16LE(buf []byte) int16 {
-	w := getS16BE(buf)
-	// exchange bytes
-	v := (w&0xFF)<<8 + w>>8
-	return v
-}
-
-// getU16BE extract 2-byte integer as unsigned big-endian.
-func getU16BE(buf []byte) uint16 {
-	v := uint16(buf[0])<<8 + uint16(buf[1])
-	return v
-}
-
-// getU16LE extract 2-byte integer as unsigned little-endian.
-func getU16LE(buf []byte) uint16 {
-	w := getU16BE(buf)
-	// exchange bytes
-	v := (w&0xFF)<<8 + w>>8
-	return v
-}
-
-func calcCRC1(seed byte, buf []byte) byte {
-	for i := 0; i < len(buf); i++ {
-		b := buf[ /*len(buf)-1-*/ i]
-		for j := 0; j < 8; j++ {
-			if (seed^b)&0x01 != 0 {
-				seed ^= 0x18
-				seed >>= 1
-				seed |= 0x80
-				// crc = crc ^ 0x8c
-			} else {
-				seed >>= 1
-			}
-			b >>= 1
-		}
-	}
-	return seed
-}
-
-// Round float amount to certain precision.
-func round64(value float64, precision int) float64 {
-	value2 := math.Round(value*math.Pow10(precision)) /
-		math.Pow10(precision)
-	return value2
-}
-
-// Round float amount to certain precision.
-func round32(value float32, precision int) float32 {
-	return float32(round64(float64(value), precision))
-}
-
-// Read byte block from i2c device to struct object.
-func readDataToStruct(i2c *i2c.I2C, byteCount int,
-	byteOrder binary.ByteOrder, obj interface{}) error {
-	buf1 := make([]byte, byteCount)
-	_, err := i2c.ReadBytes(buf1)
-	if err != nil {
-		return err
-	}
-	buf := bytes.NewBuffer(buf1)
-	err = binary.Read(buf, byteOrder, obj)
-	if err != nil {
-		return err
-	}
-	return nil
-}

vendor/github.com/eiannone/keyboard/.gitignore

@@ -0,0 +1,28 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+
+# JetBrains IntelliJIdea
+*.iml
+.idea/

vendor/github.com/eiannone/keyboard/AUTHORS

@@ -0,0 +1,5 @@
+# Please keep this file sorted.
+
+Emanuele Iannone <emanuele@fondani.it>
+Georg Reinke <guelfey@googlemail.com>
+nsf <no.smile.face@gmail.com>

vendor/github.com/eiannone/keyboard/LICENSE

@@ -0,0 +1,23 @@
+The MIT License (MIT)
+
+Copyright (C) 2012 termbox-go authors
+Copyright (c) 2015 Emanuele Iannone
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

vendor/github.com/eiannone/keyboard/README.md

@@ -0,0 +1,81 @@
+# Keyboard
+Simple library to listen for keystrokes from the keyboard
+
+The code is inspired by [termbox-go](https://github.com/nsf/termbox-go) library.
+
+### Installation
+Install and update this go package with `go get -u github.com/eiannone/keyboard`
+
+### Usage
+Example of getting a single keystroke:
+
+```go
+char, _, err := keyboard.GetSingleKey()
+if (err != nil) {
+    panic(err)
+}
+fmt.Printf("You pressed: %q\r\n", char)
+```
+
+Example of getting a series of keystrokes with a blocking `GetKey()` function:
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/eiannone/keyboard"
+)
+
+func main() {		
+	if err := keyboard.Open(); err != nil {
+		panic(err)
+	}
+	defer func() {
+		_ = keyboard.Close()
+	}()
+
+	fmt.Println("Press ESC to quit")
+	for {
+		char, key, err := keyboard.GetKey()
+		if err != nil {
+			panic(err)
+		}
+		fmt.Printf("You pressed: rune %q, key %X\r\n", char, key)
+        if key == keyboard.KeyEsc {
+			break
+		}
+	}	
+}
+```
+
+Example of getting a series of keystrokes using a channel:
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/eiannone/keyboard"
+)
+
+func main() {
+	keysEvents, err := keyboard.GetKeys(10)
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		_ = keyboard.Close()
+	}()
+
+	fmt.Println("Press ESC to quit")
+	for {
+		event := <-keysEvents
+		if event.Err != nil {
+			panic(event.Err)
+		}
+		fmt.Printf("You pressed: rune %q, key %X\r\n", event.Rune, event.Key)
+		if event.Key == keyboard.KeyEsc {
+			break
+		}
+	}
+}
+```

vendor/github.com/eiannone/keyboard/keyboard.go

@@ -0,0 +1,207 @@
+// +build !windows
+
+package keyboard
+
+import (
+	"errors"
+	"golang.org/x/sys/unix"
+	"os"
+	"os/signal"
+	"runtime"
+	"strings"
+	"syscall"
+	"unicode/utf8"
+)
+
+type (
+	input_event struct {
+		data []byte
+		err  error
+	}
+)
+
+var (
+	out *os.File
+	in  int
+
+	// term specific keys
+	keys []string
+
+	// termbox inner state
+	orig_tios unix.Termios
+
+	sigio       = make(chan os.Signal, 1)
+	quitEvProd  = make(chan bool)
+	quitConsole = make(chan bool)
+	inbuf       = make([]byte, 0, 128)
+	input_buf   = make(chan input_event)
+)
+
+func parse_escape_sequence(buf []byte) (size int, event KeyEvent) {
+	bufstr := string(buf)
+	for i, key := range keys {
+		if strings.HasPrefix(bufstr, key) {
+			event.Rune = 0
+			event.Key = Key(0xFFFF - i)
+			size = len(key)
+			return
+		}
+	}
+	return 0, event
+}
+
+func extract_event(inbuf []byte) (int, KeyEvent) {
+	if len(inbuf) == 0 {
+		return 0, KeyEvent{}
+	}
+
+	if inbuf[0] == '\033' {
+		if len(inbuf) == 1 {
+			return 1, KeyEvent{Key: KeyEsc}
+		}
+		// possible escape sequence
+		if size, event := parse_escape_sequence(inbuf); size != 0 {
+			return size, event
+		} else {
+			// it's not a recognized escape sequence, return error
+			i := 1 // check for multiple sequences in the buffer
+			for ; i < len(inbuf) && inbuf[i] != '\033'; i++ {
+			}
+			return i, KeyEvent{Key: KeyEsc, Err: errors.New("Unrecognized escape sequence")}
+		}
+	}
+
+	// if we're here, this is not an escape sequence and not an alt sequence
+	// so, it's a FUNCTIONAL KEY or a UNICODE character
+
+	// first of all check if it's a functional key
+	if Key(inbuf[0]) <= KeySpace || Key(inbuf[0]) == KeyBackspace2 {
+		return 1, KeyEvent{Key: Key(inbuf[0])}
+	}
+
+	// the only possible option is utf8 rune
+	if r, n := utf8.DecodeRune(inbuf); r != utf8.RuneError {
+		return n, KeyEvent{Rune: r}
+	}
+
+	return 0, KeyEvent{}
+}
+
+// Wait for an event and return it. This is a blocking function call.
+func inputEventsProducer() {
+	for {
+		select {
+		case <-quitEvProd:
+			return
+		case ev := <-input_buf:
+			if ev.err != nil {
+				select {
+				case <-quitEvProd:
+					return
+				case inputComm <- KeyEvent{Err: ev.err}:
+				}
+				break
+			}
+			inbuf = append(inbuf, ev.data...)
+			for {
+				size, event := extract_event(inbuf)
+				if size > 0 {
+					select {
+					case <-quitEvProd:
+						return
+					case inputComm <- event:
+					}
+					copy(inbuf, inbuf[size:])
+					inbuf = inbuf[:len(inbuf)-size]
+				}
+				if size == 0 || len(inbuf) == 0 {
+					break
+				}
+			}
+		}
+	}
+}
+
+func initConsole() (err error) {
+	out, err = os.OpenFile("/dev/tty", unix.O_WRONLY, 0)
+	if err != nil {
+		return
+	}
+	in, err = syscall.Open("/dev/tty", unix.O_RDONLY, 0)
+	if err != nil {
+		return
+	}
+
+	err = setup_term()
+	if err != nil {
+		return errors.New("Error while reading terminfo data:" + err.Error())
+	}
+
+	signal.Notify(sigio, unix.SIGIO)
+
+	if _, err = unix.FcntlInt(uintptr(in), unix.F_SETFL, unix.O_ASYNC|unix.O_NONBLOCK); err != nil {
+		return
+	}
+	_, err = unix.FcntlInt(uintptr(in), unix.F_SETOWN, unix.Getpid())
+	if runtime.GOOS != "darwin" && err != nil {
+		return
+	}
+
+	if err = unix.IoctlSetTermios(int(out.Fd()), ioctl_GETATTR, &orig_tios); err != nil {
+		return
+	}
+
+	tios := orig_tios
+	tios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK |
+		unix.ISTRIP | unix.INLCR | unix.IGNCR |
+		unix.ICRNL | unix.IXON
+	tios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON |
+		unix.ISIG | unix.IEXTEN
+	tios.Cflag &^= unix.CSIZE | unix.PARENB
+	tios.Cflag |= unix.CS8
+	tios.Cc[unix.VMIN] = 1
+	tios.Cc[unix.VTIME] = 0
+
+	if err = unix.IoctlSetTermios(int(out.Fd()), ioctl_SETATTR, &tios); err != nil {
+		return
+	}
+
+	go func() {
+		buf := make([]byte, 128)
+		for {
+			select {
+			case <-quitConsole:
+				return
+			case <-sigio:
+				for {
+					bytesRead, err := syscall.Read(in, buf)
+					if err == unix.EAGAIN || err == unix.EWOULDBLOCK {
+						break
+					}
+					if err != nil {
+						bytesRead = 0
+					}
+					data := make([]byte, bytesRead)
+					copy(data, buf)
+					select {
+					case <-quitConsole:
+						return
+					case input_buf <- input_event{data, err}:
+						continue
+					}
+				}
+			}
+		}
+	}()
+
+	go inputEventsProducer()
+	return
+}
+
+func releaseConsole() {
+	quitConsole <- true
+	quitEvProd <- true
+	unix.IoctlSetTermios(int(out.Fd()), ioctl_SETATTR, &orig_tios)
+	out.Close()
+	unix.Close(in)
+}

vendor/github.com/eiannone/keyboard/keyboard_common.go

@@ -0,0 +1,231 @@
+package keyboard
+
+import (
+	"errors"
+	"time"
+)
+
+type (
+	Key uint16
+
+	KeyEvent struct {
+		Key  Key   // One of Key* constants, invalid if 'Ch' is not 0
+		Rune rune  // A unicode character
+		Err  error // Error in case if input failed
+	}
+)
+
+// Key constants, see GetKey() function.
+const (
+	KeyF1 Key = 0xFFFF - iota
+	KeyF2
+	KeyF3
+	KeyF4
+	KeyF5
+	KeyF6
+	KeyF7
+	KeyF8
+	KeyF9
+	KeyF10
+	KeyF11
+	KeyF12
+	KeyInsert
+	KeyDelete
+	KeyHome
+	KeyEnd
+	KeyPgup
+	KeyPgdn
+	KeyArrowUp
+	KeyArrowDown
+	KeyArrowLeft
+	KeyArrowRight
+	key_min // see terminfo
+)
+
+const (
+	KeyCtrlTilde      Key = 0x00
+	KeyCtrl2          Key = 0x00
+	KeyCtrlSpace      Key = 0x00
+	KeyCtrlA          Key = 0x01
+	KeyCtrlB          Key = 0x02
+	KeyCtrlC          Key = 0x03
+	KeyCtrlD          Key = 0x04
+	KeyCtrlE          Key = 0x05
+	KeyCtrlF          Key = 0x06
+	KeyCtrlG          Key = 0x07
+	KeyBackspace      Key = 0x08
+	KeyCtrlH          Key = 0x08
+	KeyTab            Key = 0x09
+	KeyCtrlI          Key = 0x09
+	KeyCtrlJ          Key = 0x0A
+	KeyCtrlK          Key = 0x0B
+	KeyCtrlL          Key = 0x0C
+	KeyEnter          Key = 0x0D
+	KeyCtrlM          Key = 0x0D
+	KeyCtrlN          Key = 0x0E
+	KeyCtrlO          Key = 0x0F
+	KeyCtrlP          Key = 0x10
+	KeyCtrlQ          Key = 0x11
+	KeyCtrlR          Key = 0x12
+	KeyCtrlS          Key = 0x13
+	KeyCtrlT          Key = 0x14
+	KeyCtrlU          Key = 0x15
+	KeyCtrlV          Key = 0x16
+	KeyCtrlW          Key = 0x17
+	KeyCtrlX          Key = 0x18
+	KeyCtrlY          Key = 0x19
+	KeyCtrlZ          Key = 0x1A
+	KeyEsc            Key = 0x1B
+	KeyCtrlLsqBracket Key = 0x1B
+	KeyCtrl3          Key = 0x1B
+	KeyCtrl4          Key = 0x1C
+	KeyCtrlBackslash  Key = 0x1C
+	KeyCtrl5          Key = 0x1D
+	KeyCtrlRsqBracket Key = 0x1D
+	KeyCtrl6          Key = 0x1E
+	KeyCtrl7          Key = 0x1F
+	KeyCtrlSlash      Key = 0x1F
+	KeyCtrlUnderscore Key = 0x1F
+	KeySpace          Key = 0x20
+	KeyBackspace2     Key = 0x7F
+	KeyCtrl8          Key = 0x7F
+)
+
+var (
+	inputComm chan KeyEvent
+
+	ping          = make(chan bool)
+	doneClosing   = make(chan bool, 1)
+	busy          = make(chan bool)
+	waitingForKey = make(chan bool)
+)
+
+func IsStarted(timeout time.Duration) bool {
+	select {
+	case ping <- true:
+		return true
+	case <-time.After(timeout):
+		return false
+	}
+}
+
+func GetKeys(bufferSize int) (<-chan KeyEvent, error) {
+	if IsStarted(time.Millisecond * 1) {
+		if cap(inputComm) == bufferSize {
+			return inputComm, nil
+		}
+		return nil, errors.New("channel already started with a different capacity")
+	}
+	select {
+	case busy <- true:
+		return nil, errors.New("cannot open keyboard because program is busy")
+	default:
+	}
+	// Signal busy operation
+	go func() {
+		for <-busy {
+		} // Close the routine when busy is false
+	}()
+
+	inputComm = make(chan KeyEvent, bufferSize)
+	err := initConsole()
+	if err != nil {
+		close(inputComm)
+		busy <- false
+		return nil, err
+	}
+
+	// Signal ping subroutine started
+	go func() {
+		defer func() {
+			releaseConsole()
+			close(inputComm)
+			doneClosing <- true
+		}()
+		for <-ping {
+		} // Close the routine when ping is false
+	}()
+	busy <- false
+	// Wait for ping subroutine to start
+	ping <- true
+
+	return inputComm, nil
+}
+
+func Open() (err error) {
+	_, err = GetKeys(10)
+	return
+}
+
+// Should be called after successful initialization when functionality isn't required anymore.
+func Close() (err error) {
+	// Checks if already closing
+	select {
+	case busy <- true:
+		return errors.New("cannot close keyboard because program is busy")
+	default:
+	}
+	// Checks if already closed
+	if !IsStarted(time.Millisecond * 1) {
+		return
+	}
+
+	// Signal busy operation
+	go func() {
+		for <-busy {
+		} // Close the routine when busy is false
+	}()
+
+	// Stop responding to ping and closes initial subroutine
+	ping <- false
+
+	// Cancel GetKey() operations
+	select {
+	case waitingForKey <- false:
+		break
+	default:
+	}
+
+	// Wait for closing finished
+	<-doneClosing
+
+	busy <- false
+	return
+}
+
+func GetKey() (rune, Key, error) {
+	// Check if opened
+	if !IsStarted(time.Millisecond * 50) {
+		return 0, 0, errors.New("keyboard not opened")
+	}
+	// Check if already waiting for key
+	select {
+	case waitingForKey <- true:
+		return 0, 0, errors.New("already waiting for key")
+	default:
+	}
+
+	for {
+		select {
+		case ev := <-inputComm:
+			return ev.Rune, ev.Key, ev.Err
+
+		case keepAlive := <-waitingForKey:
+			if !keepAlive {
+				return 0, 0, errors.New("operation canceled")
+			}
+		}
+	}
+}
+
+func GetSingleKey() (ch rune, key Key, err error) {
+	err = Open()
+	if err == nil {
+		ch, key, err = GetKey()
+		errClosing := Close()
+		if err == nil {
+			err = errClosing
+		}
+	}
+	return
+}

vendor/github.com/eiannone/keyboard/keyboard_windows.go

@@ -0,0 +1,285 @@
+package keyboard
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+const (
+	vk_backspace   = 0x8
+	vk_tab         = 0x9
+	vk_enter       = 0xd
+	vk_esc         = 0x1b
+	vk_space       = 0x20
+	vk_pgup        = 0x21
+	vk_pgdn        = 0x22
+	vk_end         = 0x23
+	vk_home        = 0x24
+	vk_arrow_left  = 0x25
+	vk_arrow_up    = 0x26
+	vk_arrow_right = 0x27
+	vk_arrow_down  = 0x28
+	vk_insert      = 0x2d
+	vk_delete      = 0x2e
+
+	vk_f1  = 0x70
+	vk_f2  = 0x71
+	vk_f3  = 0x72
+	vk_f4  = 0x73
+	vk_f5  = 0x74
+	vk_f6  = 0x75
+	vk_f7  = 0x76
+	vk_f8  = 0x77
+	vk_f9  = 0x78
+	vk_f10 = 0x79
+	vk_f11 = 0x7a
+	vk_f12 = 0x7b
+
+	right_alt_pressed  = 0x1
+	left_alt_pressed   = 0x2
+	right_ctrl_pressed = 0x4
+	left_ctrl_pressed  = 0x8
+	shift_pressed      = 0x10
+
+	k32_keyEvent = 0x1
+)
+
+type (
+	wchar uint16
+	dword uint32
+	word  uint16
+
+	k32_event struct {
+		key_down          int32
+		repeat_count      word
+		virtual_key_code  word
+		virtual_scan_code word
+		unicode_char      wchar
+		control_key_state dword
+	}
+)
+
+var (
+	kernel32 = syscall.NewLazyDLL("kernel32.dll")
+
+	k32_WaitForMultipleObjects = kernel32.NewProc("WaitForMultipleObjects")
+	k32_ReadConsoleInputW      = kernel32.NewProc("ReadConsoleInputW")
+
+	hConsoleIn syscall.Handle
+	hInterrupt windows.Handle
+
+	quit = make(chan bool)
+
+	// This is just to prevent heap allocs at all costs
+	tmpArg dword
+)
+
+func getError(errno syscall.Errno) error {
+	if errno != 0 {
+		return error(errno)
+	} else {
+		return syscall.EINVAL
+	}
+}
+
+func getKeyEvent(r *k32_event) (KeyEvent, bool) {
+	e := KeyEvent{}
+
+	if r.key_down == 0 {
+		return e, false
+	}
+
+	ctrlPressed := r.control_key_state&(left_ctrl_pressed|right_ctrl_pressed) != 0
+
+	if r.virtual_key_code >= vk_f1 && r.virtual_key_code <= vk_f12 {
+		switch r.virtual_key_code {
+		case vk_f1:
+			e.Key = KeyF1
+		case vk_f2:
+			e.Key = KeyF2
+		case vk_f3:
+			e.Key = KeyF3
+		case vk_f4:
+			e.Key = KeyF4
+		case vk_f5:
+			e.Key = KeyF5
+		case vk_f6:
+			e.Key = KeyF6
+		case vk_f7:
+			e.Key = KeyF7
+		case vk_f8:
+			e.Key = KeyF8
+		case vk_f9:
+			e.Key = KeyF9
+		case vk_f10:
+			e.Key = KeyF10
+		case vk_f11:
+			e.Key = KeyF11
+		case vk_f12:
+			e.Key = KeyF12
+		default:
+			panic("unreachable")
+		}
+
+		return e, true
+	}
+
+	if r.virtual_key_code <= vk_delete {
+		switch r.virtual_key_code {
+		case vk_insert:
+			e.Key = KeyInsert
+		case vk_delete:
+			e.Key = KeyDelete
+		case vk_home:
+			e.Key = KeyHome
+		case vk_end:
+			e.Key = KeyEnd
+		case vk_pgup:
+			e.Key = KeyPgup
+		case vk_pgdn:
+			e.Key = KeyPgdn
+		case vk_arrow_up:
+			e.Key = KeyArrowUp
+		case vk_arrow_down:
+			e.Key = KeyArrowDown
+		case vk_arrow_left:
+			e.Key = KeyArrowLeft
+		case vk_arrow_right:
+			e.Key = KeyArrowRight
+		case vk_backspace:
+			if ctrlPressed {
+				e.Key = KeyBackspace2
+			} else {
+				e.Key = KeyBackspace
+			}
+		case vk_tab:
+			e.Key = KeyTab
+		case vk_enter:
+			e.Key = KeyEnter
+		case vk_esc:
+			e.Key = KeyEsc
+		case vk_space:
+			if ctrlPressed {
+				// manual return here, because KeyCtrlSpace is zero
+				e.Key = KeyCtrlSpace
+				return e, true
+			} else {
+				e.Key = KeySpace
+			}
+		}
+
+		if e.Key != 0 {
+			return e, true
+		}
+	}
+
+	if ctrlPressed {
+		if Key(r.unicode_char) >= KeyCtrlA && Key(r.unicode_char) <= KeyCtrlRsqBracket {
+			e.Key = Key(r.unicode_char)
+			return e, true
+		}
+		switch r.virtual_key_code {
+		case 192, 50:
+			// manual return here, because KeyCtrl2 is zero
+			e.Key = KeyCtrl2
+			return e, true
+		case 51:
+			e.Key = KeyCtrl3
+		case 52:
+			e.Key = KeyCtrl4
+		case 53:
+			e.Key = KeyCtrl5
+		case 54:
+			e.Key = KeyCtrl6
+		case 189, 191, 55:
+			e.Key = KeyCtrl7
+		case 8, 56:
+			e.Key = KeyCtrl8
+		}
+
+		if e.Key != 0 {
+			return e, true
+		}
+	}
+
+	if r.unicode_char != 0 {
+		e.Rune = rune(r.unicode_char)
+		return e, true
+	}
+
+	return e, false
+}
+
+func produceEvent(event KeyEvent) bool {
+	select {
+	case <-quit:
+		return false
+	case inputComm <- event:
+		return true
+	}
+}
+
+func inputEventsProducer() {
+	var input [20]uint16
+	for {
+		// Wait for events
+		// https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-waitformultipleobjects
+		r0, _, e1 := syscall.Syscall6(k32_WaitForMultipleObjects.Addr(), 4,
+			uintptr(2), uintptr(unsafe.Pointer(&hConsoleIn)), 0, windows.INFINITE, 0, 0)
+		if uint32(r0) == windows.WAIT_FAILED && false == produceEvent(KeyEvent{Err: getError(e1)}) {
+			return
+		}
+		select {
+		case <-quit:
+			return
+		default:
+		}
+
+		// Get console input
+		r0, _, e1 = syscall.Syscall6(k32_ReadConsoleInputW.Addr(), 4,
+			uintptr(hConsoleIn), uintptr(unsafe.Pointer(&input[0])), 1, uintptr(unsafe.Pointer(&tmpArg)), 0, 0)
+		if int(r0) == 0 {
+			if false == produceEvent(KeyEvent{Err: getError(e1)}) {
+				return
+			}
+		} else if input[0] == k32_keyEvent {
+			kEvent := (*k32_event)(unsafe.Pointer(&input[2]))
+			ev, ok := getKeyEvent(kEvent)
+			if ok {
+				for i := 0; i < int(kEvent.repeat_count); i++ {
+					if false == produceEvent(ev) {
+						return
+					}
+				}
+			}
+		}
+	}
+}
+
+func initConsole() (err error) {
+	// Create an interrupt event
+	hInterrupt, err = windows.CreateEvent(nil, 0, 0, nil)
+	if err != nil {
+		return err
+	}
+
+	hConsoleIn, err = syscall.Open("CONIN$", windows.O_RDWR, 0)
+	if err != nil {
+		windows.Close(hInterrupt)
+		return
+	}
+
+	go inputEventsProducer()
+	return
+}
+
+func releaseConsole() {
+	// Stop events producer
+	windows.SetEvent(hInterrupt)
+	quit <- true
+
+	syscall.Close(hConsoleIn)
+	windows.Close(hInterrupt)
+}

vendor/github.com/eiannone/keyboard/syscalls.go

@@ -0,0 +1,12 @@
+// +build !windows,!linux
+
+package keyboard
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+const (
+	ioctl_GETATTR = unix.TIOCGETA
+	ioctl_SETATTR = unix.TIOCSETA
+)

vendor/github.com/eiannone/keyboard/syscalls_linux.go

@@ -0,0 +1,10 @@
+package keyboard
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+const (
+	ioctl_GETATTR = unix.TCGETS
+	ioctl_SETATTR = unix.TCSETS
+)

vendor/github.com/eiannone/keyboard/terminfo.go

@@ -0,0 +1,257 @@
+// +build !windows
+
+// This file is imported from https://github.com/nsf/termbox-go
+// Last update: 2020-04-30
+
+// This file contains a simple and incomplete implementation of the terminfo
+// database. Information was taken from the ncurses manpages term(5) and
+// terminfo(5). Currently, only the string capabilities for special keys and for
+// functions without parameters are actually used. Colors are still done with
+// ANSI escape sequences. Other special features that are not (yet?) supported
+// are reading from ~/.terminfo, the TERMINFO_DIRS variable, Berkeley database
+// format and extended capabilities.
+
+package keyboard
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+const (
+	ti_header_length = 12
+)
+
+var (
+	eterm_keys = []string{
+		"\x1b[11~", "\x1b[12~", "\x1b[13~", "\x1b[14~", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[7~", "\x1b[8~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+	}
+	screen_keys = []string{
+		"\x1bOP", "\x1bOQ", "\x1bOR", "\x1bOS", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[1~", "\x1b[4~", "\x1b[5~", "\x1b[6~", "\x1bOA", "\x1bOB", "\x1bOD", "\x1bOC",
+	}
+	xterm_keys = []string{
+		"\x1bOP", "\x1bOQ", "\x1bOR", "\x1bOS", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[H", "\x1b[F", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+	}
+	rxvt_keys = []string{
+		"\x1b[11~", "\x1b[12~", "\x1b[13~", "\x1b[14~", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[7~", "\x1b[8~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+	}
+	linux_keys = []string{
+		"\x1b[[A", "\x1b[[B", "\x1b[[C", "\x1b[[D", "\x1b[[E", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[1~", "\x1b[4~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+	}
+
+	terms = []struct {
+		name string
+		keys []string
+	}{
+		{"Eterm", eterm_keys},
+		{"screen", screen_keys},
+		{"xterm", xterm_keys},
+		{"xterm-256color", xterm_keys},
+		{"rxvt-unicode", rxvt_keys},
+		{"rxvt-256color", rxvt_keys},
+		{"linux", linux_keys},
+	}
+)
+
+func load_terminfo() ([]byte, error) {
+	var data []byte
+	var err error
+
+	term := os.Getenv("TERM")
+	if term == "" {
+		return nil, errors.New("terminfo: TERM not set")
+	}
+	// Check if is a builtin terminal
+	for _, t := range terms {
+		if t.name == term {
+			return nil, errors.New("use built in!")
+		}
+	}
+
+	// The following behaviour follows the one described in terminfo(5) as
+	// distributed by ncurses.
+
+	terminfo := os.Getenv("TERMINFO")
+	if terminfo != "" {
+		// if TERMINFO is set, no other directory should be searched
+		return ti_try_path(terminfo)
+	}
+
+	// next, consider ~/.terminfo
+	home := os.Getenv("HOME")
+	if home != "" {
+		data, err = ti_try_path(home + "/.terminfo")
+		if err == nil {
+			return data, nil
+		}
+	}
+
+	// next, TERMINFO_DIRS
+	dirs := os.Getenv("TERMINFO_DIRS")
+	if dirs != "" {
+		for _, dir := range strings.Split(dirs, ":") {
+			if dir == "" {
+				// "" -> "/usr/share/terminfo"
+				dir = "/usr/share/terminfo"
+			}
+			data, err = ti_try_path(dir)
+			if err == nil {
+				return data, nil
+			}
+		}
+	}
+
+	// next, /lib/terminfo
+	data, err = ti_try_path("/lib/terminfo")
+	if err == nil {
+		return data, nil
+	}
+
+	// fall back to /usr/share/terminfo
+	return ti_try_path("/usr/share/terminfo")
+}
+
+func ti_try_path(path string) (data []byte, err error) {
+	// load_terminfo already made sure it is set
+	term := os.Getenv("TERM")
+
+	// first try, the typical *nix path
+	terminfo := path + "/" + term[0:1] + "/" + term
+	data, err = ioutil.ReadFile(terminfo)
+	if err == nil {
+		return
+	}
+
+	// fallback to darwin specific dirs structure
+	terminfo = path + "/" + hex.EncodeToString([]byte(term[:1])) + "/" + term
+	data, err = ioutil.ReadFile(terminfo)
+	return
+}
+
+func setup_term_builtin() error {
+	name := os.Getenv("TERM")
+	if name == "" {
+		return errors.New("terminfo: TERM environment variable not set")
+	}
+
+	for _, t := range terms {
+		if t.name == name {
+			keys = t.keys
+			return nil
+		}
+	}
+
+	compat_table := []struct {
+		partial string
+		keys    []string
+	}{
+		{"xterm", xterm_keys},
+		{"xterm-256color", xterm_keys},
+		{"rxvt", rxvt_keys},
+		{"rxvt-unicode", rxvt_keys},
+		{"rxvt-256color", rxvt_keys},
+		{"linux", linux_keys},
+		{"Eterm", eterm_keys},
+		{"screen", screen_keys},
+		// let's assume that 'cygwin' is xterm compatible
+		{"cygwin", xterm_keys},
+		{"st", xterm_keys},
+	}
+
+	// try compatibility variants
+	for _, it := range compat_table {
+		if strings.Contains(name, it.partial) {
+			keys = it.keys
+			return nil
+		}
+	}
+
+	return errors.New("termbox: unsupported terminal")
+}
+
+func setup_term() (err error) {
+	var data []byte
+	var header [6]int16
+	var str_offset, table_offset int16
+
+	data, err = load_terminfo()
+	if err != nil {
+		return setup_term_builtin()
+	}
+
+	rd := bytes.NewReader(data)
+	// 0: magic number, 1: size of names section, 2: size of boolean section, 3:
+	// size of numbers section (in integers), 4: size of the strings section (in
+	// integers), 5: size of the string table
+
+	err = binary.Read(rd, binary.LittleEndian, header[:])
+	if err != nil {
+		return
+	}
+
+	if header[0] != 542 && header[0] != 282 {
+		return setup_term_builtin()
+	}
+
+	number_sec_len := int16(2)
+	if header[0] == 542 { // doc says it should be octal 0542, but what I see it terminfo files is 542, learn to program please... thank you..
+		number_sec_len = 4
+	}
+
+	if (header[1]+header[2])%2 != 0 {
+		// old quirk to align everything on word boundaries
+		header[2] += 1
+	}
+	str_offset = ti_header_length + header[1] + header[2] + number_sec_len*header[3]
+	table_offset = str_offset + 2*header[4]
+
+	keys = make([]string, 0xFFFF-key_min)
+	for i := range keys {
+		keys[i], err = ti_read_string(rd, str_offset+2*ti_keys[i], table_offset)
+		if err != nil {
+			return
+		}
+	}
+	return nil
+}
+
+func ti_read_string(rd *bytes.Reader, str_off, table int16) (string, error) {
+	var off int16
+
+	_, err := rd.Seek(int64(str_off), 0)
+	if err != nil {
+		return "", err
+	}
+	err = binary.Read(rd, binary.LittleEndian, &off)
+	if err != nil {
+		return "", err
+	}
+	_, err = rd.Seek(int64(table+off), 0)
+	if err != nil {
+		return "", err
+	}
+	var bs []byte
+	for {
+		b, err := rd.ReadByte()
+		if err != nil {
+			return "", err
+		}
+		if b == byte(0x00) {
+			break
+		}
+		bs = append(bs, b)
+	}
+	return string(bs), nil
+}
+
+// "Maps" special keys constants from termbox.go to the number of the respective
+// string capability in the terminfo file. Taken from (ncurses) term.h.
+var ti_keys = []int16{
+	66, 68 /* apparently not a typo; 67 is F10 for whatever reason */, 69, 70,
+	71, 72, 73, 74, 75, 67, 216, 217, 77, 59, 76, 164, 82, 81, 87, 61, 79, 83,
+}

vendor/github.com/fsnotify/fsnotify/.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*.go]
+indent_style = tab
+indent_size = 4
+insert_final_newline = true
+
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true

vendor/github.com/fsnotify/fsnotify/.gitattributes

@@ -0,0 +1 @@
+go.sum linguist-generated

vendor/github.com/fsnotify/fsnotify/.gitignore

@@ -0,0 +1,6 @@
+# Setup a Global .gitignore for OS and editor generated files:
+# https://help.github.com/articles/ignoring-files
+# git config --global core.excludesfile ~/.gitignore_global
+
+.vagrant
+*.sublime-project

vendor/github.com/fsnotify/fsnotify/.travis.yml

@@ -0,0 +1,36 @@
+sudo: false
+language: go
+
+go:
+  - "stable"
+  - "1.11.x"
+  - "1.10.x"
+  - "1.9.x"
+
+matrix:
+  include:
+    - go: "stable"
+      env: GOLINT=true
+  allow_failures:
+    - go: tip
+  fast_finish: true
+
+
+before_install:
+  - if [ ! -z "${GOLINT}" ]; then go get -u golang.org/x/lint/golint; fi
+
+script:
+  - go test --race ./...
+
+after_script:
+  - test -z "$(gofmt -s -l -w . | tee /dev/stderr)"
+  - if [ ! -z  "${GOLINT}" ]; then echo running golint; golint --set_exit_status  ./...; else echo skipping golint; fi
+  - go vet ./...
+
+os:
+  - linux
+  - osx
+  - windows
+
+notifications:
+  email: false

vendor/github.com/fsnotify/fsnotify/AUTHORS

@@ -0,0 +1,52 @@
+# Names should be added to this file as
+#	Name or Organization <email address>
+# The email address is not required for organizations.
+
+# You can update this list using the following command:
+#
+#   $ git shortlog -se | awk '{print $2 " " $3 " " $4}'
+
+# Please keep the list sorted.
+
+Aaron L <aaron@bettercoder.net>
+Adrien Bustany <adrien@bustany.org>
+Amit Krishnan <amit.krishnan@oracle.com>
+Anmol Sethi <me@anmol.io>
+Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
+Bruno Bigras <bigras.bruno@gmail.com>
+Caleb Spare <cespare@gmail.com>
+Case Nelson <case@teammating.com>
+Chris Howey <chris@howey.me> <howeyc@gmail.com>
+Christoffer Buchholz <christoffer.buchholz@gmail.com>
+Daniel Wagner-Hall <dawagner@gmail.com>
+Dave Cheney <dave@cheney.net>
+Evan Phoenix <evan@fallingsnow.net>
+Francisco Souza <f@souza.cc>
+Hari haran <hariharan.uno@gmail.com>
+John C Barstow
+Kelvin Fo <vmirage@gmail.com>
+Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
+Matt Layher <mdlayher@gmail.com>
+Nathan Youngman <git@nathany.com>
+Nickolai Zeldovich <nickolai@csail.mit.edu>
+Patrick <patrick@dropbox.com>
+Paul Hammond <paul@paulhammond.org>
+Pawel Knap <pawelknap88@gmail.com>
+Pieter Droogendijk <pieter@binky.org.uk>
+Pursuit92 <JoshChase@techpursuit.net>
+Riku Voipio <riku.voipio@linaro.org>
+Rob Figueiredo <robfig@gmail.com>
+Rodrigo Chiossi <rodrigochiossi@gmail.com>
+Slawek Ligus <root@ooz.ie>
+Soge Zhang <zhssoge@gmail.com>
+Tiffany Jernigan <tiffany.jernigan@intel.com>
+Tilak Sharma <tilaks@google.com>
+Tom Payne <twpayne@gmail.com>
+Travis Cline <travis.cline@gmail.com>
+Tudor Golubenco <tudor.g@gmail.com>
+Vahe Khachikyan <vahe@live.ca>
+Yukang <moorekang@gmail.com>
+bronze1man <bronze1man@gmail.com>
+debrando <denis.brandolini@gmail.com>
+henrikedwards <henrik.edwards@gmail.com>
+铁哥 <guotie.9@gmail.com>

vendor/github.com/fsnotify/fsnotify/CHANGELOG.md

@@ -0,0 +1,317 @@
+# Changelog
+
+## v1.4.7 / 2018-01-09
+
+* BSD/macOS: Fix possible deadlock on closing the watcher on kqueue (thanks @nhooyr and @glycerine)
+* Tests: Fix missing verb on format string (thanks @rchiossi)
+* Linux: Fix deadlock in Remove (thanks @aarondl)
+* Linux: Watch.Add improvements (avoid race, fix consistency, reduce garbage) (thanks @twpayne)
+* Docs: Moved FAQ into the README (thanks @vahe)
+* Linux: Properly handle inotify's IN_Q_OVERFLOW event (thanks @zeldovich)
+* Docs: replace references to OS X with macOS
+
+## v1.4.2 / 2016-10-10
+
+* Linux: use InotifyInit1 with IN_CLOEXEC to stop leaking a file descriptor to a child process when using fork/exec [#178](https://github.com/fsnotify/fsnotify/pull/178) (thanks @pattyshack)
+
+## v1.4.1 / 2016-10-04
+
+* Fix flaky inotify stress test on Linux [#177](https://github.com/fsnotify/fsnotify/pull/177) (thanks @pattyshack)
+
+## v1.4.0 / 2016-10-01
+
+* add a String() method to Event.Op [#165](https://github.com/fsnotify/fsnotify/pull/165) (thanks @oozie)
+
+## v1.3.1 / 2016-06-28
+
+* Windows: fix for double backslash when watching the root of a drive [#151](https://github.com/fsnotify/fsnotify/issues/151) (thanks @brunoqc)
+
+## v1.3.0 / 2016-04-19
+
+* Support linux/arm64 by [patching](https://go-review.googlesource.com/#/c/21971/) x/sys/unix and switching to to it from syscall (thanks @suihkulokki) [#135](https://github.com/fsnotify/fsnotify/pull/135)
+
+## v1.2.10 / 2016-03-02
+
+* Fix golint errors in windows.go [#121](https://github.com/fsnotify/fsnotify/pull/121) (thanks @tiffanyfj)
+
+## v1.2.9 / 2016-01-13
+
+kqueue: Fix logic for CREATE after REMOVE [#111](https://github.com/fsnotify/fsnotify/pull/111) (thanks @bep)
+
+## v1.2.8 / 2015-12-17
+
+* kqueue: fix race condition in Close [#105](https://github.com/fsnotify/fsnotify/pull/105) (thanks @djui for reporting the issue and @ppknap for writing a failing test)
+* inotify: fix race in test
+* enable race detection for continuous integration (Linux, Mac, Windows)
+
+## v1.2.5 / 2015-10-17
+
+* inotify: use epoll_create1 for arm64 support (requires Linux 2.6.27 or later) [#100](https://github.com/fsnotify/fsnotify/pull/100) (thanks @suihkulokki)
+* inotify: fix path leaks [#73](https://github.com/fsnotify/fsnotify/pull/73) (thanks @chamaken)
+* kqueue: watch for rename events on subdirectories [#83](https://github.com/fsnotify/fsnotify/pull/83) (thanks @guotie)
+* kqueue: avoid infinite loops from symlinks cycles [#101](https://github.com/fsnotify/fsnotify/pull/101) (thanks @illicitonion)
+
+## v1.2.1 / 2015-10-14
+
+* kqueue: don't watch named pipes [#98](https://github.com/fsnotify/fsnotify/pull/98) (thanks @evanphx)
+
+## v1.2.0 / 2015-02-08
+
+* inotify: use epoll to wake up readEvents [#66](https://github.com/fsnotify/fsnotify/pull/66) (thanks @PieterD)
+* inotify: closing watcher should now always shut down goroutine [#63](https://github.com/fsnotify/fsnotify/pull/63) (thanks @PieterD)
+* kqueue: close kqueue after removing watches, fixes [#59](https://github.com/fsnotify/fsnotify/issues/59)
+
+## v1.1.1 / 2015-02-05
+
+* inotify: Retry read on EINTR [#61](https://github.com/fsnotify/fsnotify/issues/61) (thanks @PieterD)
+
+## v1.1.0 / 2014-12-12
+
+* kqueue: rework internals [#43](https://github.com/fsnotify/fsnotify/pull/43)
+    * add low-level functions
+    * only need to store flags on directories
+    * less mutexes [#13](https://github.com/fsnotify/fsnotify/issues/13)
+    * done can be an unbuffered channel
+    * remove calls to os.NewSyscallError
+* More efficient string concatenation for Event.String() [#52](https://github.com/fsnotify/fsnotify/pull/52) (thanks @mdlayher)
+* kqueue: fix regression in  rework causing subdirectories to be watched [#48](https://github.com/fsnotify/fsnotify/issues/48)
+* kqueue: cleanup internal watch before sending remove event [#51](https://github.com/fsnotify/fsnotify/issues/51)
+
+## v1.0.4 / 2014-09-07
+
+* kqueue: add dragonfly to the build tags.
+* Rename source code files, rearrange code so exported APIs are at the top.
+* Add done channel to example code. [#37](https://github.com/fsnotify/fsnotify/pull/37) (thanks @chenyukang)
+
+## v1.0.3 / 2014-08-19
+
+* [Fix] Windows MOVED_TO now translates to Create like on BSD and Linux. [#36](https://github.com/fsnotify/fsnotify/issues/36)
+
+## v1.0.2 / 2014-08-17
+
+* [Fix] Missing create events on macOS. [#14](https://github.com/fsnotify/fsnotify/issues/14) (thanks @zhsso)
+* [Fix] Make ./path and path equivalent. (thanks @zhsso)
+
+## v1.0.0 / 2014-08-15
+
+* [API] Remove AddWatch on Windows, use Add.
+* Improve documentation for exported identifiers. [#30](https://github.com/fsnotify/fsnotify/issues/30)
+* Minor updates based on feedback from golint.
+
+## dev / 2014-07-09
+
+* Moved to [github.com/fsnotify/fsnotify](https://github.com/fsnotify/fsnotify).
+* Use os.NewSyscallError instead of returning errno (thanks @hariharan-uno)
+
+## dev / 2014-07-04
+
+* kqueue: fix incorrect mutex used in Close()
+* Update example to demonstrate usage of Op.
+
+## dev / 2014-06-28
+
+* [API] Don't set the Write Op for attribute notifications [#4](https://github.com/fsnotify/fsnotify/issues/4)
+* Fix for String() method on Event (thanks Alex Brainman)
+* Don't build on Plan 9 or Solaris (thanks @4ad)
+
+## dev / 2014-06-21
+
+* Events channel of type Event rather than *Event.
+* [internal] use syscall constants directly for inotify and kqueue.
+* [internal] kqueue: rename events to kevents and fileEvent to event.
+
+## dev / 2014-06-19
+
+* Go 1.3+ required on Windows (uses syscall.ERROR_MORE_DATA internally).
+* [internal] remove cookie from Event struct (unused).
+* [internal] Event struct has the same definition across every OS.
+* [internal] remove internal watch and removeWatch methods.
+
+## dev / 2014-06-12
+
+* [API] Renamed Watch() to Add() and RemoveWatch() to Remove().
+* [API] Pluralized channel names: Events and Errors.
+* [API] Renamed FileEvent struct to Event.
+* [API] Op constants replace methods like IsCreate().
+
+## dev / 2014-06-12
+
+* Fix data race on kevent buffer (thanks @tilaks) [#98](https://github.com/howeyc/fsnotify/pull/98)
+
+## dev / 2014-05-23
+
+* [API] Remove current implementation of WatchFlags.
+    * current implementation doesn't take advantage of OS for efficiency
+    * provides little benefit over filtering events as they are received, but has  extra bookkeeping and mutexes
+    * no tests for the current implementation
+    * not fully implemented on Windows [#93](https://github.com/howeyc/fsnotify/issues/93#issuecomment-39285195)
+
+## v0.9.3 / 2014-12-31
+
+* kqueue: cleanup internal watch before sending remove event [#51](https://github.com/fsnotify/fsnotify/issues/51)
+
+## v0.9.2 / 2014-08-17
+
+* [Backport] Fix missing create events on macOS. [#14](https://github.com/fsnotify/fsnotify/issues/14) (thanks @zhsso)
+
+## v0.9.1 / 2014-06-12
+
+* Fix data race on kevent buffer (thanks @tilaks) [#98](https://github.com/howeyc/fsnotify/pull/98)
+
+## v0.9.0 / 2014-01-17
+
+* IsAttrib() for events that only concern a file's metadata [#79][] (thanks @abustany)
+* [Fix] kqueue: fix deadlock [#77][] (thanks @cespare)
+* [NOTICE] Development has moved to `code.google.com/p/go.exp/fsnotify` in preparation for inclusion in the Go standard library.
+
+## v0.8.12 / 2013-11-13
+
+* [API] Remove FD_SET and friends from Linux adapter
+
+## v0.8.11 / 2013-11-02
+
+* [Doc] Add Changelog [#72][] (thanks @nathany)
+* [Doc] Spotlight and double modify events on macOS [#62][] (reported by @paulhammond)
+
+## v0.8.10 / 2013-10-19
+
+* [Fix] kqueue: remove file watches when parent directory is removed [#71][] (reported by @mdwhatcott)
+* [Fix] kqueue: race between Close and readEvents [#70][] (reported by @bernerdschaefer)
+* [Doc] specify OS-specific limits in README (thanks @debrando)
+
+## v0.8.9 / 2013-09-08
+
+* [Doc] Contributing (thanks @nathany)
+* [Doc] update package path in example code [#63][] (thanks @paulhammond)
+* [Doc] GoCI badge in README (Linux only) [#60][]
+* [Doc] Cross-platform testing with Vagrant  [#59][] (thanks @nathany)
+
+## v0.8.8 / 2013-06-17
+
+* [Fix] Windows: handle `ERROR_MORE_DATA` on Windows [#49][] (thanks @jbowtie)
+
+## v0.8.7 / 2013-06-03
+
+* [API] Make syscall flags internal
+* [Fix] inotify: ignore event changes
+* [Fix] race in symlink test [#45][] (reported by @srid)
+* [Fix] tests on Windows
+* lower case error messages
+
+## v0.8.6 / 2013-05-23
+
+* kqueue: Use EVT_ONLY flag on Darwin
+* [Doc] Update README with full example
+
+## v0.8.5 / 2013-05-09
+
+* [Fix] inotify: allow monitoring of "broken" symlinks (thanks @tsg)
+
+## v0.8.4 / 2013-04-07
+
+* [Fix] kqueue: watch all file events [#40][] (thanks @ChrisBuchholz)
+
+## v0.8.3 / 2013-03-13
+
+* [Fix] inoitfy/kqueue memory leak [#36][] (reported by @nbkolchin)
+* [Fix] kqueue: use fsnFlags for watching a directory [#33][] (reported by @nbkolchin)
+
+## v0.8.2 / 2013-02-07
+
+* [Doc] add Authors
+* [Fix] fix data races for map access [#29][] (thanks @fsouza)
+
+## v0.8.1 / 2013-01-09
+
+* [Fix] Windows path separators
+* [Doc] BSD License
+
+## v0.8.0 / 2012-11-09
+
+* kqueue: directory watching improvements (thanks @vmirage)
+* inotify: add `IN_MOVED_TO` [#25][] (requested by @cpisto)
+* [Fix] kqueue: deleting watched directory [#24][] (reported by @jakerr)
+
+## v0.7.4 / 2012-10-09
+
+* [Fix] inotify: fixes from https://codereview.appspot.com/5418045/ (ugorji)
+* [Fix] kqueue: preserve watch flags when watching for delete [#21][] (reported by @robfig)
+* [Fix] kqueue: watch the directory even if it isn't a new watch (thanks @robfig)
+* [Fix] kqueue: modify after recreation of file
+
+## v0.7.3 / 2012-09-27
+
+* [Fix] kqueue: watch with an existing folder inside the watched folder (thanks @vmirage)
+* [Fix] kqueue: no longer get duplicate CREATE events
+
+## v0.7.2 / 2012-09-01
+
+* kqueue: events for created directories
+
+## v0.7.1 / 2012-07-14
+
+* [Fix] for renaming files
+
+## v0.7.0 / 2012-07-02
+
+* [Feature] FSNotify flags
+* [Fix] inotify: Added file name back to event path
+
+## v0.6.0 / 2012-06-06
+
+* kqueue: watch files after directory created (thanks @tmc)
+
+## v0.5.1 / 2012-05-22
+
+* [Fix] inotify: remove all watches before Close()
+
+## v0.5.0 / 2012-05-03
+
+* [API] kqueue: return errors during watch instead of sending over channel
+* kqueue: match symlink behavior on Linux
+* inotify: add `DELETE_SELF` (requested by @taralx)
+* [Fix] kqueue: handle EINTR (reported by @robfig)
+* [Doc] Godoc example [#1][] (thanks @davecheney)
+
+## v0.4.0 / 2012-03-30
+
+* Go 1 released: build with go tool
+* [Feature] Windows support using winfsnotify
+* Windows does not have attribute change notifications
+* Roll attribute notifications into IsModify
+
+## v0.3.0 / 2012-02-19
+
+* kqueue: add files when watch directory
+
+## v0.2.0 / 2011-12-30
+
+* update to latest Go weekly code
+
+## v0.1.0 / 2011-10-19
+
+* kqueue: add watch on file creation to match inotify
+* kqueue: create file event
+* inotify: ignore `IN_IGNORED` events
+* event String()
+* linux: common FileEvent functions
+* initial commit
+
+[#79]: https://github.com/howeyc/fsnotify/pull/79
+[#77]: https://github.com/howeyc/fsnotify/pull/77
+[#72]: https://github.com/howeyc/fsnotify/issues/72
+[#71]: https://github.com/howeyc/fsnotify/issues/71
+[#70]: https://github.com/howeyc/fsnotify/issues/70
+[#63]: https://github.com/howeyc/fsnotify/issues/63
+[#62]: https://github.com/howeyc/fsnotify/issues/62
+[#60]: https://github.com/howeyc/fsnotify/issues/60
+[#59]: https://github.com/howeyc/fsnotify/issues/59
+[#49]: https://github.com/howeyc/fsnotify/issues/49
+[#45]: https://github.com/howeyc/fsnotify/issues/45
+[#40]: https://github.com/howeyc/fsnotify/issues/40
+[#36]: https://github.com/howeyc/fsnotify/issues/36
+[#33]: https://github.com/howeyc/fsnotify/issues/33
+[#29]: https://github.com/howeyc/fsnotify/issues/29
+[#25]: https://github.com/howeyc/fsnotify/issues/25
+[#24]: https://github.com/howeyc/fsnotify/issues/24
+[#21]: https://github.com/howeyc/fsnotify/issues/21

vendor/github.com/fsnotify/fsnotify/CONTRIBUTING.md

@@ -0,0 +1,77 @@
+# Contributing
+
+## Issues
+
+* Request features and report bugs using the [GitHub Issue Tracker](https://github.com/fsnotify/fsnotify/issues).
+* Please indicate the platform you are using fsnotify on.
+* A code example to reproduce the problem is appreciated.
+
+## Pull Requests
+
+### Contributor License Agreement
+
+fsnotify is derived from code in the [golang.org/x/exp](https://godoc.org/golang.org/x/exp) package and it may be included [in the standard library](https://github.com/fsnotify/fsnotify/issues/1) in the future. Therefore fsnotify carries the same [LICENSE](https://github.com/fsnotify/fsnotify/blob/master/LICENSE) as Go. Contributors retain their copyright, so you need to fill out a short form before we can accept your contribution: [Google Individual Contributor License Agreement](https://developers.google.com/open-source/cla/individual).
+
+Please indicate that you have signed the CLA in your pull request.
+
+### How fsnotify is Developed
+
+* Development is done on feature branches.
+* Tests are run on BSD, Linux, macOS and Windows.
+* Pull requests are reviewed and [applied to master][am] using [hub][].
+  * Maintainers may modify or squash commits rather than asking contributors to.
+* To issue a new release, the maintainers will:
+  * Update the CHANGELOG
+  * Tag a version, which will become available through gopkg.in.
+ 
+### How to Fork
+
+For smooth sailing, always use the original import path. Installing with `go get` makes this easy. 
+
+1. Install from GitHub (`go get -u github.com/fsnotify/fsnotify`)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Ensure everything works and the tests pass (see below)
+4. Commit your changes (`git commit -am 'Add some feature'`)
+
+Contribute upstream:
+
+1. Fork fsnotify on GitHub
+2. Add your remote (`git remote add fork git@github.com:mycompany/repo.git`)
+3. Push to the branch (`git push fork my-new-feature`)
+4. Create a new Pull Request on GitHub
+
+This workflow is [thoroughly explained by Katrina Owen](https://splice.com/blog/contributing-open-source-git-repositories-go/).
+
+### Testing
+
+fsnotify uses build tags to compile different code on Linux, BSD, macOS, and Windows.
+
+Before doing a pull request, please do your best to test your changes on multiple platforms, and list which platforms you were able/unable to test on.
+
+To aid in cross-platform testing there is a Vagrantfile for Linux and BSD.
+
+* Install [Vagrant](http://www.vagrantup.com/) and [VirtualBox](https://www.virtualbox.org/)
+* Setup [Vagrant Gopher](https://github.com/nathany/vagrant-gopher) in your `src` folder.
+* Run `vagrant up` from the project folder. You can also setup just one box with `vagrant up linux` or `vagrant up bsd` (note: the BSD box doesn't support Windows hosts at this time, and NFS may prompt for your host OS password)
+* Once setup, you can run the test suite on a given OS with a single command `vagrant ssh linux -c 'cd fsnotify/fsnotify; go test'`.
+* When you're done, you will want to halt or destroy the Vagrant boxes.
+
+Notice: fsnotify file system events won't trigger in shared folders. The tests get around this limitation by using the /tmp directory.
+
+Right now there is no equivalent solution for Windows and macOS, but there are Windows VMs [freely available from Microsoft](http://www.modern.ie/en-us/virtualization-tools#downloads).
+
+### Maintainers
+
+Help maintaining fsnotify is welcome. To be a maintainer:
+
+* Submit a pull request and sign the CLA as above.
+* You must be able to run the test suite on Mac, Windows, Linux and BSD.
+
+To keep master clean, the fsnotify project uses the "apply mail" workflow outlined in Nathaniel Talbott's post ["Merge pull request" Considered Harmful][am]. This requires installing [hub][].
+
+All code changes should be internal pull requests.
+
+Releases are tagged using [Semantic Versioning](http://semver.org/).
+
+[hub]: https://github.com/github/hub
+[am]: http://blog.spreedly.com/2014/06/24/merge-pull-request-considered-harmful/#.VGa5yZPF_Zs

vendor/github.com/fsnotify/fsnotify/LICENSE

@@ -0,0 +1,28 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+Copyright (c) 2012-2019 fsnotify Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/fsnotify/fsnotify/README.md

@@ -0,0 +1,130 @@
+# File system notifications for Go
+
+[![GoDoc](https://godoc.org/github.com/fsnotify/fsnotify?status.svg)](https://godoc.org/github.com/fsnotify/fsnotify) [![Go Report Card](https://goreportcard.com/badge/github.com/fsnotify/fsnotify)](https://goreportcard.com/report/github.com/fsnotify/fsnotify)
+
+fsnotify utilizes [golang.org/x/sys](https://godoc.org/golang.org/x/sys) rather than `syscall` from the standard library. Ensure you have the latest version installed by running:
+
+```console
+go get -u golang.org/x/sys/...
+```
+
+Cross platform: Windows, Linux, BSD and macOS.
+
+| Adapter               | OS                               | Status                                                                                                                          |
+| --------------------- | -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
+| inotify               | Linux 2.6.27 or later, Android\* | Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify) |
+| kqueue                | BSD, macOS, iOS\*                | Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify) |
+| ReadDirectoryChangesW | Windows                          | Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify) |
+| FSEvents              | macOS                            | [Planned](https://github.com/fsnotify/fsnotify/issues/11)                                                                       |
+| FEN                   | Solaris 11                       | [In Progress](https://github.com/fsnotify/fsnotify/issues/12)                                                                   |
+| fanotify              | Linux 2.6.37+                    | [Planned](https://github.com/fsnotify/fsnotify/issues/114)                                                                      |
+| USN Journals          | Windows                          | [Maybe](https://github.com/fsnotify/fsnotify/issues/53)                                                                         |
+| Polling               | *All*                            | [Maybe](https://github.com/fsnotify/fsnotify/issues/9)                                                                          |
+
+\* Android and iOS are untested.
+
+Please see [the documentation](https://godoc.org/github.com/fsnotify/fsnotify) and consult the [FAQ](#faq) for usage information.
+
+## API stability
+
+fsnotify is a fork of [howeyc/fsnotify](https://godoc.org/github.com/howeyc/fsnotify) with a new API as of v1.0. The API is based on [this design document](http://goo.gl/MrYxyA). 
+
+All [releases](https://github.com/fsnotify/fsnotify/releases) are tagged based on [Semantic Versioning](http://semver.org/). Further API changes are [planned](https://github.com/fsnotify/fsnotify/milestones), and will be tagged with a new major revision number.
+
+Go 1.6 supports dependencies located in the `vendor/` folder. Unless you are creating a library, it is recommended that you copy fsnotify into `vendor/github.com/fsnotify/fsnotify` within your project, and likewise for `golang.org/x/sys`.
+
+## Usage
+
+```go
+package main
+
+import (
+	"log"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+func main() {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer watcher.Close()
+
+	done := make(chan bool)
+	go func() {
+		for {
+			select {
+			case event, ok := <-watcher.Events:
+				if !ok {
+					return
+				}
+				log.Println("event:", event)
+				if event.Op&fsnotify.Write == fsnotify.Write {
+					log.Println("modified file:", event.Name)
+				}
+			case err, ok := <-watcher.Errors:
+				if !ok {
+					return
+				}
+				log.Println("error:", err)
+			}
+		}
+	}()
+
+	err = watcher.Add("/tmp/foo")
+	if err != nil {
+		log.Fatal(err)
+	}
+	<-done
+}
+```
+
+## Contributing
+
+Please refer to [CONTRIBUTING][] before opening an issue or pull request.
+
+## Example
+
+See [example_test.go](https://github.com/fsnotify/fsnotify/blob/master/example_test.go).
+
+## FAQ
+
+**When a file is moved to another directory is it still being watched?**
+
+No (it shouldn't be, unless you are watching where it was moved to).
+
+**When I watch a directory, are all subdirectories watched as well?**
+
+No, you must add watches for any directory you want to watch (a recursive watcher is on the roadmap [#18][]).
+
+**Do I have to watch the Error and Event channels in a separate goroutine?**
+
+As of now, yes. Looking into making this single-thread friendly (see [howeyc #7][#7])
+
+**Why am I receiving multiple events for the same file on OS X?**
+
+Spotlight indexing on OS X can result in multiple events (see [howeyc #62][#62]). A temporary workaround is to add your folder(s) to the *Spotlight Privacy settings* until we have a native FSEvents implementation (see [#11][]).
+
+**How many files can be watched at once?**
+
+There are OS-specific limits as to how many watches can be created:
+* Linux: /proc/sys/fs/inotify/max_user_watches contains the limit, reaching this limit results in a "no space left on device" error.
+* BSD / OSX: sysctl variables "kern.maxfiles" and "kern.maxfilesperproc", reaching these limits results in a "too many open files" error.
+
+**Why don't notifications work with NFS filesystems or filesystem in userspace (FUSE)?**
+
+fsnotify requires support from underlying OS to work. The current NFS protocol does not provide network level support for file notifications.
+
+[#62]: https://github.com/howeyc/fsnotify/issues/62
+[#18]: https://github.com/fsnotify/fsnotify/issues/18
+[#11]: https://github.com/fsnotify/fsnotify/issues/11
+[#7]: https://github.com/howeyc/fsnotify/issues/7
+
+[contributing]: https://github.com/fsnotify/fsnotify/blob/master/CONTRIBUTING.md
+
+## Related Projects
+
+* [notify](https://github.com/rjeczalik/notify)
+* [fsevents](https://github.com/fsnotify/fsevents)
+

vendor/github.com/fsnotify/fsnotify/fen.go

@@ -0,0 +1,37 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package fsnotify
+
+import (
+	"errors"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events chan Event
+	Errors chan error
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	return nil, errors.New("FEN based watcher not yet supported for fsnotify\n")
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	return nil
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	return nil
+}

vendor/github.com/fsnotify/fsnotify/fsnotify.go

@@ -0,0 +1,68 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9
+
+// Package fsnotify provides a platform-independent interface for file system notifications.
+package fsnotify
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+)
+
+// Event represents a single file system notification.
+type Event struct {
+	Name string // Relative path to the file or directory.
+	Op   Op     // File operation that triggered the event.
+}
+
+// Op describes a set of file operations.
+type Op uint32
+
+// These are the generalized file operations that can trigger a notification.
+const (
+	Create Op = 1 << iota
+	Write
+	Remove
+	Rename
+	Chmod
+)
+
+func (op Op) String() string {
+	// Use a buffer for efficient string concatenation
+	var buffer bytes.Buffer
+
+	if op&Create == Create {
+		buffer.WriteString("|CREATE")
+	}
+	if op&Remove == Remove {
+		buffer.WriteString("|REMOVE")
+	}
+	if op&Write == Write {
+		buffer.WriteString("|WRITE")
+	}
+	if op&Rename == Rename {
+		buffer.WriteString("|RENAME")
+	}
+	if op&Chmod == Chmod {
+		buffer.WriteString("|CHMOD")
+	}
+	if buffer.Len() == 0 {
+		return ""
+	}
+	return buffer.String()[1:] // Strip leading pipe
+}
+
+// String returns a string representation of the event in the form
+// "file: REMOVE|WRITE|..."
+func (e Event) String() string {
+	return fmt.Sprintf("%q: %s", e.Name, e.Op.String())
+}
+
+// Common errors that can be reported by a watcher
+var (
+	ErrEventOverflow = errors.New("fsnotify queue overflow")
+)

vendor/github.com/fsnotify/fsnotify/go.mod

@@ -0,0 +1,5 @@
+module github.com/fsnotify/fsnotify
+
+go 1.13
+
+require golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9

vendor/github.com/fsnotify/fsnotify/go.sum

@@ -0,0 +1,2 @@
+golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9 h1:L2auWcuQIvxz9xSEqzESnV/QN/gNRXNApHi3fYwl2w0=
+golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

vendor/github.com/fsnotify/fsnotify/inotify.go

@@ -0,0 +1,337 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events   chan Event
+	Errors   chan error
+	mu       sync.Mutex // Map access
+	fd       int
+	poller   *fdPoller
+	watches  map[string]*watch // Map of inotify watches (key: path)
+	paths    map[int]string    // Map of watched paths (key: watch descriptor)
+	done     chan struct{}     // Channel for sending a "quit message" to the reader goroutine
+	doneResp chan struct{}     // Channel to respond to Close
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	// Create inotify fd
+	fd, errno := unix.InotifyInit1(unix.IN_CLOEXEC)
+	if fd == -1 {
+		return nil, errno
+	}
+	// Create epoll
+	poller, err := newFdPoller(fd)
+	if err != nil {
+		unix.Close(fd)
+		return nil, err
+	}
+	w := &Watcher{
+		fd:       fd,
+		poller:   poller,
+		watches:  make(map[string]*watch),
+		paths:    make(map[int]string),
+		Events:   make(chan Event),
+		Errors:   make(chan error),
+		done:     make(chan struct{}),
+		doneResp: make(chan struct{}),
+	}
+
+	go w.readEvents()
+	return w, nil
+}
+
+func (w *Watcher) isClosed() bool {
+	select {
+	case <-w.done:
+		return true
+	default:
+		return false
+	}
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	if w.isClosed() {
+		return nil
+	}
+
+	// Send 'close' signal to goroutine, and set the Watcher to closed.
+	close(w.done)
+
+	// Wake up goroutine
+	w.poller.wake()
+
+	// Wait for goroutine to close
+	<-w.doneResp
+
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	name = filepath.Clean(name)
+	if w.isClosed() {
+		return errors.New("inotify instance already closed")
+	}
+
+	const agnosticEvents = unix.IN_MOVED_TO | unix.IN_MOVED_FROM |
+		unix.IN_CREATE | unix.IN_ATTRIB | unix.IN_MODIFY |
+		unix.IN_MOVE_SELF | unix.IN_DELETE | unix.IN_DELETE_SELF
+
+	var flags uint32 = agnosticEvents
+
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	watchEntry := w.watches[name]
+	if watchEntry != nil {
+		flags |= watchEntry.flags | unix.IN_MASK_ADD
+	}
+	wd, errno := unix.InotifyAddWatch(w.fd, name, flags)
+	if wd == -1 {
+		return errno
+	}
+
+	if watchEntry == nil {
+		w.watches[name] = &watch{wd: uint32(wd), flags: flags}
+		w.paths[wd] = name
+	} else {
+		watchEntry.wd = uint32(wd)
+		watchEntry.flags = flags
+	}
+
+	return nil
+}
+
+// Remove stops watching the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	name = filepath.Clean(name)
+
+	// Fetch the watch.
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	watch, ok := w.watches[name]
+
+	// Remove it from inotify.
+	if !ok {
+		return fmt.Errorf("can't remove non-existent inotify watch for: %s", name)
+	}
+
+	// We successfully removed the watch if InotifyRmWatch doesn't return an
+	// error, we need to clean up our internal state to ensure it matches
+	// inotify's kernel state.
+	delete(w.paths, int(watch.wd))
+	delete(w.watches, name)
+
+	// inotify_rm_watch will return EINVAL if the file has been deleted;
+	// the inotify will already have been removed.
+	// watches and pathes are deleted in ignoreLinux() implicitly and asynchronously
+	// by calling inotify_rm_watch() below. e.g. readEvents() goroutine receives IN_IGNORE
+	// so that EINVAL means that the wd is being rm_watch()ed or its file removed
+	// by another thread and we have not received IN_IGNORE event.
+	success, errno := unix.InotifyRmWatch(w.fd, watch.wd)
+	if success == -1 {
+		// TODO: Perhaps it's not helpful to return an error here in every case.
+		// the only two possible errors are:
+		// EBADF, which happens when w.fd is not a valid file descriptor of any kind.
+		// EINVAL, which is when fd is not an inotify descriptor or wd is not a valid watch descriptor.
+		// Watch descriptors are invalidated when they are removed explicitly or implicitly;
+		// explicitly by inotify_rm_watch, implicitly when the file they are watching is deleted.
+		return errno
+	}
+
+	return nil
+}
+
+type watch struct {
+	wd    uint32 // Watch descriptor (as returned by the inotify_add_watch() syscall)
+	flags uint32 // inotify flags of this watch (see inotify(7) for the list of valid flags)
+}
+
+// readEvents reads from the inotify file descriptor, converts the
+// received events into Event objects and sends them via the Events channel
+func (w *Watcher) readEvents() {
+	var (
+		buf   [unix.SizeofInotifyEvent * 4096]byte // Buffer for a maximum of 4096 raw events
+		n     int                                  // Number of bytes read with read()
+		errno error                                // Syscall errno
+		ok    bool                                 // For poller.wait
+	)
+
+	defer close(w.doneResp)
+	defer close(w.Errors)
+	defer close(w.Events)
+	defer unix.Close(w.fd)
+	defer w.poller.close()
+
+	for {
+		// See if we have been closed.
+		if w.isClosed() {
+			return
+		}
+
+		ok, errno = w.poller.wait()
+		if errno != nil {
+			select {
+			case w.Errors <- errno:
+			case <-w.done:
+				return
+			}
+			continue
+		}
+
+		if !ok {
+			continue
+		}
+
+		n, errno = unix.Read(w.fd, buf[:])
+		// If a signal interrupted execution, see if we've been asked to close, and try again.
+		// http://man7.org/linux/man-pages/man7/signal.7.html :
+		// "Before Linux 3.8, reads from an inotify(7) file descriptor were not restartable"
+		if errno == unix.EINTR {
+			continue
+		}
+
+		// unix.Read might have been woken up by Close. If so, we're done.
+		if w.isClosed() {
+			return
+		}
+
+		if n < unix.SizeofInotifyEvent {
+			var err error
+			if n == 0 {
+				// If EOF is received. This should really never happen.
+				err = io.EOF
+			} else if n < 0 {
+				// If an error occurred while reading.
+				err = errno
+			} else {
+				// Read was too short.
+				err = errors.New("notify: short read in readEvents()")
+			}
+			select {
+			case w.Errors <- err:
+			case <-w.done:
+				return
+			}
+			continue
+		}
+
+		var offset uint32
+		// We don't know how many events we just read into the buffer
+		// While the offset points to at least one whole event...
+		for offset <= uint32(n-unix.SizeofInotifyEvent) {
+			// Point "raw" to the event in the buffer
+			raw := (*unix.InotifyEvent)(unsafe.Pointer(&buf[offset]))
+
+			mask := uint32(raw.Mask)
+			nameLen := uint32(raw.Len)
+
+			if mask&unix.IN_Q_OVERFLOW != 0 {
+				select {
+				case w.Errors <- ErrEventOverflow:
+				case <-w.done:
+					return
+				}
+			}
+
+			// If the event happened to the watched directory or the watched file, the kernel
+			// doesn't append the filename to the event, but we would like to always fill the
+			// the "Name" field with a valid filename. We retrieve the path of the watch from
+			// the "paths" map.
+			w.mu.Lock()
+			name, ok := w.paths[int(raw.Wd)]
+			// IN_DELETE_SELF occurs when the file/directory being watched is removed.
+			// This is a sign to clean up the maps, otherwise we are no longer in sync
+			// with the inotify kernel state which has already deleted the watch
+			// automatically.
+			if ok && mask&unix.IN_DELETE_SELF == unix.IN_DELETE_SELF {
+				delete(w.paths, int(raw.Wd))
+				delete(w.watches, name)
+			}
+			w.mu.Unlock()
+
+			if nameLen > 0 {
+				// Point "bytes" at the first byte of the filename
+				bytes := (*[unix.PathMax]byte)(unsafe.Pointer(&buf[offset+unix.SizeofInotifyEvent]))
+				// The filename is padded with NULL bytes. TrimRight() gets rid of those.
+				name += "/" + strings.TrimRight(string(bytes[0:nameLen]), "\000")
+			}
+
+			event := newEvent(name, mask)
+
+			// Send the events that are not ignored on the events channel
+			if !event.ignoreLinux(mask) {
+				select {
+				case w.Events <- event:
+				case <-w.done:
+					return
+				}
+			}
+
+			// Move to the next event in the buffer
+			offset += unix.SizeofInotifyEvent + nameLen
+		}
+	}
+}
+
+// Certain types of events can be "ignored" and not sent over the Events
+// channel. Such as events marked ignore by the kernel, or MODIFY events
+// against files that do not exist.
+func (e *Event) ignoreLinux(mask uint32) bool {
+	// Ignore anything the inotify API says to ignore
+	if mask&unix.IN_IGNORED == unix.IN_IGNORED {
+		return true
+	}
+
+	// If the event is not a DELETE or RENAME, the file must exist.
+	// Otherwise the event is ignored.
+	// *Note*: this was put in place because it was seen that a MODIFY
+	// event was sent after the DELETE. This ignores that MODIFY and
+	// assumes a DELETE will come or has come if the file doesn't exist.
+	if !(e.Op&Remove == Remove || e.Op&Rename == Rename) {
+		_, statErr := os.Lstat(e.Name)
+		return os.IsNotExist(statErr)
+	}
+	return false
+}
+
+// newEvent returns an platform-independent Event based on an inotify mask.
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&unix.IN_CREATE == unix.IN_CREATE || mask&unix.IN_MOVED_TO == unix.IN_MOVED_TO {
+		e.Op |= Create
+	}
+	if mask&unix.IN_DELETE_SELF == unix.IN_DELETE_SELF || mask&unix.IN_DELETE == unix.IN_DELETE {
+		e.Op |= Remove
+	}
+	if mask&unix.IN_MODIFY == unix.IN_MODIFY {
+		e.Op |= Write
+	}
+	if mask&unix.IN_MOVE_SELF == unix.IN_MOVE_SELF || mask&unix.IN_MOVED_FROM == unix.IN_MOVED_FROM {
+		e.Op |= Rename
+	}
+	if mask&unix.IN_ATTRIB == unix.IN_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}

vendor/github.com/fsnotify/fsnotify/inotify_poller.go

@@ -0,0 +1,187 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package fsnotify
+
+import (
+	"errors"
+
+	"golang.org/x/sys/unix"
+)
+
+type fdPoller struct {
+	fd   int    // File descriptor (as returned by the inotify_init() syscall)
+	epfd int    // Epoll file descriptor
+	pipe [2]int // Pipe for waking up
+}
+
+func emptyPoller(fd int) *fdPoller {
+	poller := new(fdPoller)
+	poller.fd = fd
+	poller.epfd = -1
+	poller.pipe[0] = -1
+	poller.pipe[1] = -1
+	return poller
+}
+
+// Create a new inotify poller.
+// This creates an inotify handler, and an epoll handler.
+func newFdPoller(fd int) (*fdPoller, error) {
+	var errno error
+	poller := emptyPoller(fd)
+	defer func() {
+		if errno != nil {
+			poller.close()
+		}
+	}()
+	poller.fd = fd
+
+	// Create epoll fd
+	poller.epfd, errno = unix.EpollCreate1(unix.EPOLL_CLOEXEC)
+	if poller.epfd == -1 {
+		return nil, errno
+	}
+	// Create pipe; pipe[0] is the read end, pipe[1] the write end.
+	errno = unix.Pipe2(poller.pipe[:], unix.O_NONBLOCK|unix.O_CLOEXEC)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Register inotify fd with epoll
+	event := unix.EpollEvent{
+		Fd:     int32(poller.fd),
+		Events: unix.EPOLLIN,
+	}
+	errno = unix.EpollCtl(poller.epfd, unix.EPOLL_CTL_ADD, poller.fd, &event)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Register pipe fd with epoll
+	event = unix.EpollEvent{
+		Fd:     int32(poller.pipe[0]),
+		Events: unix.EPOLLIN,
+	}
+	errno = unix.EpollCtl(poller.epfd, unix.EPOLL_CTL_ADD, poller.pipe[0], &event)
+	if errno != nil {
+		return nil, errno
+	}
+
+	return poller, nil
+}
+
+// Wait using epoll.
+// Returns true if something is ready to be read,
+// false if there is not.
+func (poller *fdPoller) wait() (bool, error) {
+	// 3 possible events per fd, and 2 fds, makes a maximum of 6 events.
+	// I don't know whether epoll_wait returns the number of events returned,
+	// or the total number of events ready.
+	// I decided to catch both by making the buffer one larger than the maximum.
+	events := make([]unix.EpollEvent, 7)
+	for {
+		n, errno := unix.EpollWait(poller.epfd, events, -1)
+		if n == -1 {
+			if errno == unix.EINTR {
+				continue
+			}
+			return false, errno
+		}
+		if n == 0 {
+			// If there are no events, try again.
+			continue
+		}
+		if n > 6 {
+			// This should never happen. More events were returned than should be possible.
+			return false, errors.New("epoll_wait returned more events than I know what to do with")
+		}
+		ready := events[:n]
+		epollhup := false
+		epollerr := false
+		epollin := false
+		for _, event := range ready {
+			if event.Fd == int32(poller.fd) {
+				if event.Events&unix.EPOLLHUP != 0 {
+					// This should not happen, but if it does, treat it as a wakeup.
+					epollhup = true
+				}
+				if event.Events&unix.EPOLLERR != 0 {
+					// If an error is waiting on the file descriptor, we should pretend
+					// something is ready to read, and let unix.Read pick up the error.
+					epollerr = true
+				}
+				if event.Events&unix.EPOLLIN != 0 {
+					// There is data to read.
+					epollin = true
+				}
+			}
+			if event.Fd == int32(poller.pipe[0]) {
+				if event.Events&unix.EPOLLHUP != 0 {
+					// Write pipe descriptor was closed, by us. This means we're closing down the
+					// watcher, and we should wake up.
+				}
+				if event.Events&unix.EPOLLERR != 0 {
+					// If an error is waiting on the pipe file descriptor.
+					// This is an absolute mystery, and should never ever happen.
+					return false, errors.New("Error on the pipe descriptor.")
+				}
+				if event.Events&unix.EPOLLIN != 0 {
+					// This is a regular wakeup, so we have to clear the buffer.
+					err := poller.clearWake()
+					if err != nil {
+						return false, err
+					}
+				}
+			}
+		}
+
+		if epollhup || epollerr || epollin {
+			return true, nil
+		}
+		return false, nil
+	}
+}
+
+// Close the write end of the poller.
+func (poller *fdPoller) wake() error {
+	buf := make([]byte, 1)
+	n, errno := unix.Write(poller.pipe[1], buf)
+	if n == -1 {
+		if errno == unix.EAGAIN {
+			// Buffer is full, poller will wake.
+			return nil
+		}
+		return errno
+	}
+	return nil
+}
+
+func (poller *fdPoller) clearWake() error {
+	// You have to be woken up a LOT in order to get to 100!
+	buf := make([]byte, 100)
+	n, errno := unix.Read(poller.pipe[0], buf)
+	if n == -1 {
+		if errno == unix.EAGAIN {
+			// Buffer is empty, someone else cleared our wake.
+			return nil
+		}
+		return errno
+	}
+	return nil
+}
+
+// Close all poller file descriptors, but not the one passed to it.
+func (poller *fdPoller) close() {
+	if poller.pipe[1] != -1 {
+		unix.Close(poller.pipe[1])
+	}
+	if poller.pipe[0] != -1 {
+		unix.Close(poller.pipe[0])
+	}
+	if poller.epfd != -1 {
+		unix.Close(poller.epfd)
+	}
+}

vendor/github.com/fsnotify/fsnotify/kqueue.go

@@ -0,0 +1,521 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build freebsd openbsd netbsd dragonfly darwin
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events chan Event
+	Errors chan error
+	done   chan struct{} // Channel for sending a "quit message" to the reader goroutine
+
+	kq int // File descriptor (as returned by the kqueue() syscall).
+
+	mu              sync.Mutex        // Protects access to watcher data
+	watches         map[string]int    // Map of watched file descriptors (key: path).
+	externalWatches map[string]bool   // Map of watches added by user of the library.
+	dirFlags        map[string]uint32 // Map of watched directories to fflags used in kqueue.
+	paths           map[int]pathInfo  // Map file descriptors to path names for processing kqueue events.
+	fileExists      map[string]bool   // Keep track of if we know this file exists (to stop duplicate create events).
+	isClosed        bool              // Set to true when Close() is first called
+}
+
+type pathInfo struct {
+	name  string
+	isDir bool
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	kq, err := kqueue()
+	if err != nil {
+		return nil, err
+	}
+
+	w := &Watcher{
+		kq:              kq,
+		watches:         make(map[string]int),
+		dirFlags:        make(map[string]uint32),
+		paths:           make(map[int]pathInfo),
+		fileExists:      make(map[string]bool),
+		externalWatches: make(map[string]bool),
+		Events:          make(chan Event),
+		Errors:          make(chan error),
+		done:            make(chan struct{}),
+	}
+
+	go w.readEvents()
+	return w, nil
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	w.mu.Lock()
+	if w.isClosed {
+		w.mu.Unlock()
+		return nil
+	}
+	w.isClosed = true
+
+	// copy paths to remove while locked
+	var pathsToRemove = make([]string, 0, len(w.watches))
+	for name := range w.watches {
+		pathsToRemove = append(pathsToRemove, name)
+	}
+	w.mu.Unlock()
+	// unlock before calling Remove, which also locks
+
+	for _, name := range pathsToRemove {
+		w.Remove(name)
+	}
+
+	// send a "quit" message to the reader goroutine
+	close(w.done)
+
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	w.mu.Lock()
+	w.externalWatches[name] = true
+	w.mu.Unlock()
+	_, err := w.addWatch(name, noteAllEvents)
+	return err
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	name = filepath.Clean(name)
+	w.mu.Lock()
+	watchfd, ok := w.watches[name]
+	w.mu.Unlock()
+	if !ok {
+		return fmt.Errorf("can't remove non-existent kevent watch for: %s", name)
+	}
+
+	const registerRemove = unix.EV_DELETE
+	if err := register(w.kq, []int{watchfd}, registerRemove, 0); err != nil {
+		return err
+	}
+
+	unix.Close(watchfd)
+
+	w.mu.Lock()
+	isDir := w.paths[watchfd].isDir
+	delete(w.watches, name)
+	delete(w.paths, watchfd)
+	delete(w.dirFlags, name)
+	w.mu.Unlock()
+
+	// Find all watched paths that are in this directory that are not external.
+	if isDir {
+		var pathsToRemove []string
+		w.mu.Lock()
+		for _, path := range w.paths {
+			wdir, _ := filepath.Split(path.name)
+			if filepath.Clean(wdir) == name {
+				if !w.externalWatches[path.name] {
+					pathsToRemove = append(pathsToRemove, path.name)
+				}
+			}
+		}
+		w.mu.Unlock()
+		for _, name := range pathsToRemove {
+			// Since these are internal, not much sense in propagating error
+			// to the user, as that will just confuse them with an error about
+			// a path they did not explicitly watch themselves.
+			w.Remove(name)
+		}
+	}
+
+	return nil
+}
+
+// Watch all events (except NOTE_EXTEND, NOTE_LINK, NOTE_REVOKE)
+const noteAllEvents = unix.NOTE_DELETE | unix.NOTE_WRITE | unix.NOTE_ATTRIB | unix.NOTE_RENAME
+
+// keventWaitTime to block on each read from kevent
+var keventWaitTime = durationToTimespec(100 * time.Millisecond)
+
+// addWatch adds name to the watched file set.
+// The flags are interpreted as described in kevent(2).
+// Returns the real path to the file which was added, if any, which may be different from the one passed in the case of symlinks.
+func (w *Watcher) addWatch(name string, flags uint32) (string, error) {
+	var isDir bool
+	// Make ./name and name equivalent
+	name = filepath.Clean(name)
+
+	w.mu.Lock()
+	if w.isClosed {
+		w.mu.Unlock()
+		return "", errors.New("kevent instance already closed")
+	}
+	watchfd, alreadyWatching := w.watches[name]
+	// We already have a watch, but we can still override flags.
+	if alreadyWatching {
+		isDir = w.paths[watchfd].isDir
+	}
+	w.mu.Unlock()
+
+	if !alreadyWatching {
+		fi, err := os.Lstat(name)
+		if err != nil {
+			return "", err
+		}
+
+		// Don't watch sockets.
+		if fi.Mode()&os.ModeSocket == os.ModeSocket {
+			return "", nil
+		}
+
+		// Don't watch named pipes.
+		if fi.Mode()&os.ModeNamedPipe == os.ModeNamedPipe {
+			return "", nil
+		}
+
+		// Follow Symlinks
+		// Unfortunately, Linux can add bogus symlinks to watch list without
+		// issue, and Windows can't do symlinks period (AFAIK). To  maintain
+		// consistency, we will act like everything is fine. There will simply
+		// be no file events for broken symlinks.
+		// Hence the returns of nil on errors.
+		if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
+			name, err = filepath.EvalSymlinks(name)
+			if err != nil {
+				return "", nil
+			}
+
+			w.mu.Lock()
+			_, alreadyWatching = w.watches[name]
+			w.mu.Unlock()
+
+			if alreadyWatching {
+				return name, nil
+			}
+
+			fi, err = os.Lstat(name)
+			if err != nil {
+				return "", nil
+			}
+		}
+
+		watchfd, err = unix.Open(name, openMode, 0700)
+		if watchfd == -1 {
+			return "", err
+		}
+
+		isDir = fi.IsDir()
+	}
+
+	const registerAdd = unix.EV_ADD | unix.EV_CLEAR | unix.EV_ENABLE
+	if err := register(w.kq, []int{watchfd}, registerAdd, flags); err != nil {
+		unix.Close(watchfd)
+		return "", err
+	}
+
+	if !alreadyWatching {
+		w.mu.Lock()
+		w.watches[name] = watchfd
+		w.paths[watchfd] = pathInfo{name: name, isDir: isDir}
+		w.mu.Unlock()
+	}
+
+	if isDir {
+		// Watch the directory if it has not been watched before,
+		// or if it was watched before, but perhaps only a NOTE_DELETE (watchDirectoryFiles)
+		w.mu.Lock()
+
+		watchDir := (flags&unix.NOTE_WRITE) == unix.NOTE_WRITE &&
+			(!alreadyWatching || (w.dirFlags[name]&unix.NOTE_WRITE) != unix.NOTE_WRITE)
+		// Store flags so this watch can be updated later
+		w.dirFlags[name] = flags
+		w.mu.Unlock()
+
+		if watchDir {
+			if err := w.watchDirectoryFiles(name); err != nil {
+				return "", err
+			}
+		}
+	}
+	return name, nil
+}
+
+// readEvents reads from kqueue and converts the received kevents into
+// Event values that it sends down the Events channel.
+func (w *Watcher) readEvents() {
+	eventBuffer := make([]unix.Kevent_t, 10)
+
+loop:
+	for {
+		// See if there is a message on the "done" channel
+		select {
+		case <-w.done:
+			break loop
+		default:
+		}
+
+		// Get new events
+		kevents, err := read(w.kq, eventBuffer, &keventWaitTime)
+		// EINTR is okay, the syscall was interrupted before timeout expired.
+		if err != nil && err != unix.EINTR {
+			select {
+			case w.Errors <- err:
+			case <-w.done:
+				break loop
+			}
+			continue
+		}
+
+		// Flush the events we received to the Events channel
+		for len(kevents) > 0 {
+			kevent := &kevents[0]
+			watchfd := int(kevent.Ident)
+			mask := uint32(kevent.Fflags)
+			w.mu.Lock()
+			path := w.paths[watchfd]
+			w.mu.Unlock()
+			event := newEvent(path.name, mask)
+
+			if path.isDir && !(event.Op&Remove == Remove) {
+				// Double check to make sure the directory exists. This can happen when
+				// we do a rm -fr on a recursively watched folders and we receive a
+				// modification event first but the folder has been deleted and later
+				// receive the delete event
+				if _, err := os.Lstat(event.Name); os.IsNotExist(err) {
+					// mark is as delete event
+					event.Op |= Remove
+				}
+			}
+
+			if event.Op&Rename == Rename || event.Op&Remove == Remove {
+				w.Remove(event.Name)
+				w.mu.Lock()
+				delete(w.fileExists, event.Name)
+				w.mu.Unlock()
+			}
+
+			if path.isDir && event.Op&Write == Write && !(event.Op&Remove == Remove) {
+				w.sendDirectoryChangeEvents(event.Name)
+			} else {
+				// Send the event on the Events channel.
+				select {
+				case w.Events <- event:
+				case <-w.done:
+					break loop
+				}
+			}
+
+			if event.Op&Remove == Remove {
+				// Look for a file that may have overwritten this.
+				// For example, mv f1 f2 will delete f2, then create f2.
+				if path.isDir {
+					fileDir := filepath.Clean(event.Name)
+					w.mu.Lock()
+					_, found := w.watches[fileDir]
+					w.mu.Unlock()
+					if found {
+						// make sure the directory exists before we watch for changes. When we
+						// do a recursive watch and perform rm -fr, the parent directory might
+						// have gone missing, ignore the missing directory and let the
+						// upcoming delete event remove the watch from the parent directory.
+						if _, err := os.Lstat(fileDir); err == nil {
+							w.sendDirectoryChangeEvents(fileDir)
+						}
+					}
+				} else {
+					filePath := filepath.Clean(event.Name)
+					if fileInfo, err := os.Lstat(filePath); err == nil {
+						w.sendFileCreatedEventIfNew(filePath, fileInfo)
+					}
+				}
+			}
+
+			// Move to next event
+			kevents = kevents[1:]
+		}
+	}
+
+	// cleanup
+	err := unix.Close(w.kq)
+	if err != nil {
+		// only way the previous loop breaks is if w.done was closed so we need to async send to w.Errors.
+		select {
+		case w.Errors <- err:
+		default:
+		}
+	}
+	close(w.Events)
+	close(w.Errors)
+}
+
+// newEvent returns an platform-independent Event based on kqueue Fflags.
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&unix.NOTE_DELETE == unix.NOTE_DELETE {
+		e.Op |= Remove
+	}
+	if mask&unix.NOTE_WRITE == unix.NOTE_WRITE {
+		e.Op |= Write
+	}
+	if mask&unix.NOTE_RENAME == unix.NOTE_RENAME {
+		e.Op |= Rename
+	}
+	if mask&unix.NOTE_ATTRIB == unix.NOTE_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}
+
+func newCreateEvent(name string) Event {
+	return Event{Name: name, Op: Create}
+}
+
+// watchDirectoryFiles to mimic inotify when adding a watch on a directory
+func (w *Watcher) watchDirectoryFiles(dirPath string) error {
+	// Get all files
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		return err
+	}
+
+	for _, fileInfo := range files {
+		filePath := filepath.Join(dirPath, fileInfo.Name())
+		filePath, err = w.internalWatch(filePath, fileInfo)
+		if err != nil {
+			return err
+		}
+
+		w.mu.Lock()
+		w.fileExists[filePath] = true
+		w.mu.Unlock()
+	}
+
+	return nil
+}
+
+// sendDirectoryEvents searches the directory for newly created files
+// and sends them over the event channel. This functionality is to have
+// the BSD version of fsnotify match Linux inotify which provides a
+// create event for files created in a watched directory.
+func (w *Watcher) sendDirectoryChangeEvents(dirPath string) {
+	// Get all files
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		select {
+		case w.Errors <- err:
+		case <-w.done:
+			return
+		}
+	}
+
+	// Search for new files
+	for _, fileInfo := range files {
+		filePath := filepath.Join(dirPath, fileInfo.Name())
+		err := w.sendFileCreatedEventIfNew(filePath, fileInfo)
+
+		if err != nil {
+			return
+		}
+	}
+}
+
+// sendFileCreatedEvent sends a create event if the file isn't already being tracked.
+func (w *Watcher) sendFileCreatedEventIfNew(filePath string, fileInfo os.FileInfo) (err error) {
+	w.mu.Lock()
+	_, doesExist := w.fileExists[filePath]
+	w.mu.Unlock()
+	if !doesExist {
+		// Send create event
+		select {
+		case w.Events <- newCreateEvent(filePath):
+		case <-w.done:
+			return
+		}
+	}
+
+	// like watchDirectoryFiles (but without doing another ReadDir)
+	filePath, err = w.internalWatch(filePath, fileInfo)
+	if err != nil {
+		return err
+	}
+
+	w.mu.Lock()
+	w.fileExists[filePath] = true
+	w.mu.Unlock()
+
+	return nil
+}
+
+func (w *Watcher) internalWatch(name string, fileInfo os.FileInfo) (string, error) {
+	if fileInfo.IsDir() {
+		// mimic Linux providing delete events for subdirectories
+		// but preserve the flags used if currently watching subdirectory
+		w.mu.Lock()
+		flags := w.dirFlags[name]
+		w.mu.Unlock()
+
+		flags |= unix.NOTE_DELETE | unix.NOTE_RENAME
+		return w.addWatch(name, flags)
+	}
+
+	// watch file to mimic Linux inotify
+	return w.addWatch(name, noteAllEvents)
+}
+
+// kqueue creates a new kernel event queue and returns a descriptor.
+func kqueue() (kq int, err error) {
+	kq, err = unix.Kqueue()
+	if kq == -1 {
+		return kq, err
+	}
+	return kq, nil
+}
+
+// register events with the queue
+func register(kq int, fds []int, flags int, fflags uint32) error {
+	changes := make([]unix.Kevent_t, len(fds))
+
+	for i, fd := range fds {
+		// SetKevent converts int to the platform-specific types:
+		unix.SetKevent(&changes[i], fd, unix.EVFILT_VNODE, flags)
+		changes[i].Fflags = fflags
+	}
+
+	// register the events
+	success, err := unix.Kevent(kq, changes, nil, nil)
+	if success == -1 {
+		return err
+	}
+	return nil
+}
+
+// read retrieves pending events, or waits until an event occurs.
+// A timeout of nil blocks indefinitely, while 0 polls the queue.
+func read(kq int, events []unix.Kevent_t, timeout *unix.Timespec) ([]unix.Kevent_t, error) {
+	n, err := unix.Kevent(kq, nil, events, timeout)
+	if err != nil {
+		return nil, err
+	}
+	return events[0:n], nil
+}
+
+// durationToTimespec prepares a timeout value
+func durationToTimespec(d time.Duration) unix.Timespec {
+	return unix.NsecToTimespec(d.Nanoseconds())
+}

vendor/github.com/fsnotify/fsnotify/open_mode_bsd.go

@@ -0,0 +1,11 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build freebsd openbsd netbsd dragonfly
+
+package fsnotify
+
+import "golang.org/x/sys/unix"
+
+const openMode = unix.O_NONBLOCK | unix.O_RDONLY | unix.O_CLOEXEC

vendor/github.com/fsnotify/fsnotify/open_mode_darwin.go

@@ -0,0 +1,12 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+
+package fsnotify
+
+import "golang.org/x/sys/unix"
+
+// note: this constant is not defined on BSD
+const openMode = unix.O_EVTONLY | unix.O_CLOEXEC

vendor/github.com/fsnotify/fsnotify/windows.go

@@ -0,0 +1,561 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events   chan Event
+	Errors   chan error
+	isClosed bool           // Set to true when Close() is first called
+	mu       sync.Mutex     // Map access
+	port     syscall.Handle // Handle to completion port
+	watches  watchMap       // Map of watches (key: i-number)
+	input    chan *input    // Inputs to the reader are sent on this channel
+	quit     chan chan<- error
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	port, e := syscall.CreateIoCompletionPort(syscall.InvalidHandle, 0, 0, 0)
+	if e != nil {
+		return nil, os.NewSyscallError("CreateIoCompletionPort", e)
+	}
+	w := &Watcher{
+		port:    port,
+		watches: make(watchMap),
+		input:   make(chan *input, 1),
+		Events:  make(chan Event, 50),
+		Errors:  make(chan error),
+		quit:    make(chan chan<- error, 1),
+	}
+	go w.readEvents()
+	return w, nil
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	if w.isClosed {
+		return nil
+	}
+	w.isClosed = true
+
+	// Send "quit" message to the reader goroutine
+	ch := make(chan error)
+	w.quit <- ch
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-ch
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	if w.isClosed {
+		return errors.New("watcher already closed")
+	}
+	in := &input{
+		op:    opAddWatch,
+		path:  filepath.Clean(name),
+		flags: sysFSALLEVENTS,
+		reply: make(chan error),
+	}
+	w.input <- in
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-in.reply
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	in := &input{
+		op:    opRemoveWatch,
+		path:  filepath.Clean(name),
+		reply: make(chan error),
+	}
+	w.input <- in
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-in.reply
+}
+
+const (
+	// Options for AddWatch
+	sysFSONESHOT = 0x80000000
+	sysFSONLYDIR = 0x1000000
+
+	// Events
+	sysFSACCESS     = 0x1
+	sysFSALLEVENTS  = 0xfff
+	sysFSATTRIB     = 0x4
+	sysFSCLOSE      = 0x18
+	sysFSCREATE     = 0x100
+	sysFSDELETE     = 0x200
+	sysFSDELETESELF = 0x400
+	sysFSMODIFY     = 0x2
+	sysFSMOVE       = 0xc0
+	sysFSMOVEDFROM  = 0x40
+	sysFSMOVEDTO    = 0x80
+	sysFSMOVESELF   = 0x800
+
+	// Special events
+	sysFSIGNORED   = 0x8000
+	sysFSQOVERFLOW = 0x4000
+)
+
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&sysFSCREATE == sysFSCREATE || mask&sysFSMOVEDTO == sysFSMOVEDTO {
+		e.Op |= Create
+	}
+	if mask&sysFSDELETE == sysFSDELETE || mask&sysFSDELETESELF == sysFSDELETESELF {
+		e.Op |= Remove
+	}
+	if mask&sysFSMODIFY == sysFSMODIFY {
+		e.Op |= Write
+	}
+	if mask&sysFSMOVE == sysFSMOVE || mask&sysFSMOVESELF == sysFSMOVESELF || mask&sysFSMOVEDFROM == sysFSMOVEDFROM {
+		e.Op |= Rename
+	}
+	if mask&sysFSATTRIB == sysFSATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}
+
+const (
+	opAddWatch = iota
+	opRemoveWatch
+)
+
+const (
+	provisional uint64 = 1 << (32 + iota)
+)
+
+type input struct {
+	op    int
+	path  string
+	flags uint32
+	reply chan error
+}
+
+type inode struct {
+	handle syscall.Handle
+	volume uint32
+	index  uint64
+}
+
+type watch struct {
+	ov     syscall.Overlapped
+	ino    *inode            // i-number
+	path   string            // Directory path
+	mask   uint64            // Directory itself is being watched with these notify flags
+	names  map[string]uint64 // Map of names being watched and their notify flags
+	rename string            // Remembers the old name while renaming a file
+	buf    [4096]byte
+}
+
+type indexMap map[uint64]*watch
+type watchMap map[uint32]indexMap
+
+func (w *Watcher) wakeupReader() error {
+	e := syscall.PostQueuedCompletionStatus(w.port, 0, 0, nil)
+	if e != nil {
+		return os.NewSyscallError("PostQueuedCompletionStatus", e)
+	}
+	return nil
+}
+
+func getDir(pathname string) (dir string, err error) {
+	attr, e := syscall.GetFileAttributes(syscall.StringToUTF16Ptr(pathname))
+	if e != nil {
+		return "", os.NewSyscallError("GetFileAttributes", e)
+	}
+	if attr&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
+		dir = pathname
+	} else {
+		dir, _ = filepath.Split(pathname)
+		dir = filepath.Clean(dir)
+	}
+	return
+}
+
+func getIno(path string) (ino *inode, err error) {
+	h, e := syscall.CreateFile(syscall.StringToUTF16Ptr(path),
+		syscall.FILE_LIST_DIRECTORY,
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
+		nil, syscall.OPEN_EXISTING,
+		syscall.FILE_FLAG_BACKUP_SEMANTICS|syscall.FILE_FLAG_OVERLAPPED, 0)
+	if e != nil {
+		return nil, os.NewSyscallError("CreateFile", e)
+	}
+	var fi syscall.ByHandleFileInformation
+	if e = syscall.GetFileInformationByHandle(h, &fi); e != nil {
+		syscall.CloseHandle(h)
+		return nil, os.NewSyscallError("GetFileInformationByHandle", e)
+	}
+	ino = &inode{
+		handle: h,
+		volume: fi.VolumeSerialNumber,
+		index:  uint64(fi.FileIndexHigh)<<32 | uint64(fi.FileIndexLow),
+	}
+	return ino, nil
+}
+
+// Must run within the I/O thread.
+func (m watchMap) get(ino *inode) *watch {
+	if i := m[ino.volume]; i != nil {
+		return i[ino.index]
+	}
+	return nil
+}
+
+// Must run within the I/O thread.
+func (m watchMap) set(ino *inode, watch *watch) {
+	i := m[ino.volume]
+	if i == nil {
+		i = make(indexMap)
+		m[ino.volume] = i
+	}
+	i[ino.index] = watch
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) addWatch(pathname string, flags uint64) error {
+	dir, err := getDir(pathname)
+	if err != nil {
+		return err
+	}
+	if flags&sysFSONLYDIR != 0 && pathname != dir {
+		return nil
+	}
+	ino, err := getIno(dir)
+	if err != nil {
+		return err
+	}
+	w.mu.Lock()
+	watchEntry := w.watches.get(ino)
+	w.mu.Unlock()
+	if watchEntry == nil {
+		if _, e := syscall.CreateIoCompletionPort(ino.handle, w.port, 0, 0); e != nil {
+			syscall.CloseHandle(ino.handle)
+			return os.NewSyscallError("CreateIoCompletionPort", e)
+		}
+		watchEntry = &watch{
+			ino:   ino,
+			path:  dir,
+			names: make(map[string]uint64),
+		}
+		w.mu.Lock()
+		w.watches.set(ino, watchEntry)
+		w.mu.Unlock()
+		flags |= provisional
+	} else {
+		syscall.CloseHandle(ino.handle)
+	}
+	if pathname == dir {
+		watchEntry.mask |= flags
+	} else {
+		watchEntry.names[filepath.Base(pathname)] |= flags
+	}
+	if err = w.startRead(watchEntry); err != nil {
+		return err
+	}
+	if pathname == dir {
+		watchEntry.mask &= ^provisional
+	} else {
+		watchEntry.names[filepath.Base(pathname)] &= ^provisional
+	}
+	return nil
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) remWatch(pathname string) error {
+	dir, err := getDir(pathname)
+	if err != nil {
+		return err
+	}
+	ino, err := getIno(dir)
+	if err != nil {
+		return err
+	}
+	w.mu.Lock()
+	watch := w.watches.get(ino)
+	w.mu.Unlock()
+	if watch == nil {
+		return fmt.Errorf("can't remove non-existent watch for: %s", pathname)
+	}
+	if pathname == dir {
+		w.sendEvent(watch.path, watch.mask&sysFSIGNORED)
+		watch.mask = 0
+	} else {
+		name := filepath.Base(pathname)
+		w.sendEvent(filepath.Join(watch.path, name), watch.names[name]&sysFSIGNORED)
+		delete(watch.names, name)
+	}
+	return w.startRead(watch)
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) deleteWatch(watch *watch) {
+	for name, mask := range watch.names {
+		if mask&provisional == 0 {
+			w.sendEvent(filepath.Join(watch.path, name), mask&sysFSIGNORED)
+		}
+		delete(watch.names, name)
+	}
+	if watch.mask != 0 {
+		if watch.mask&provisional == 0 {
+			w.sendEvent(watch.path, watch.mask&sysFSIGNORED)
+		}
+		watch.mask = 0
+	}
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) startRead(watch *watch) error {
+	if e := syscall.CancelIo(watch.ino.handle); e != nil {
+		w.Errors <- os.NewSyscallError("CancelIo", e)
+		w.deleteWatch(watch)
+	}
+	mask := toWindowsFlags(watch.mask)
+	for _, m := range watch.names {
+		mask |= toWindowsFlags(m)
+	}
+	if mask == 0 {
+		if e := syscall.CloseHandle(watch.ino.handle); e != nil {
+			w.Errors <- os.NewSyscallError("CloseHandle", e)
+		}
+		w.mu.Lock()
+		delete(w.watches[watch.ino.volume], watch.ino.index)
+		w.mu.Unlock()
+		return nil
+	}
+	e := syscall.ReadDirectoryChanges(watch.ino.handle, &watch.buf[0],
+		uint32(unsafe.Sizeof(watch.buf)), false, mask, nil, &watch.ov, 0)
+	if e != nil {
+		err := os.NewSyscallError("ReadDirectoryChanges", e)
+		if e == syscall.ERROR_ACCESS_DENIED && watch.mask&provisional == 0 {
+			// Watched directory was probably removed
+			if w.sendEvent(watch.path, watch.mask&sysFSDELETESELF) {
+				if watch.mask&sysFSONESHOT != 0 {
+					watch.mask = 0
+				}
+			}
+			err = nil
+		}
+		w.deleteWatch(watch)
+		w.startRead(watch)
+		return err
+	}
+	return nil
+}
+
+// readEvents reads from the I/O completion port, converts the
+// received events into Event objects and sends them via the Events channel.
+// Entry point to the I/O thread.
+func (w *Watcher) readEvents() {
+	var (
+		n, key uint32
+		ov     *syscall.Overlapped
+	)
+	runtime.LockOSThread()
+
+	for {
+		e := syscall.GetQueuedCompletionStatus(w.port, &n, &key, &ov, syscall.INFINITE)
+		watch := (*watch)(unsafe.Pointer(ov))
+
+		if watch == nil {
+			select {
+			case ch := <-w.quit:
+				w.mu.Lock()
+				var indexes []indexMap
+				for _, index := range w.watches {
+					indexes = append(indexes, index)
+				}
+				w.mu.Unlock()
+				for _, index := range indexes {
+					for _, watch := range index {
+						w.deleteWatch(watch)
+						w.startRead(watch)
+					}
+				}
+				var err error
+				if e := syscall.CloseHandle(w.port); e != nil {
+					err = os.NewSyscallError("CloseHandle", e)
+				}
+				close(w.Events)
+				close(w.Errors)
+				ch <- err
+				return
+			case in := <-w.input:
+				switch in.op {
+				case opAddWatch:
+					in.reply <- w.addWatch(in.path, uint64(in.flags))
+				case opRemoveWatch:
+					in.reply <- w.remWatch(in.path)
+				}
+			default:
+			}
+			continue
+		}
+
+		switch e {
+		case syscall.ERROR_MORE_DATA:
+			if watch == nil {
+				w.Errors <- errors.New("ERROR_MORE_DATA has unexpectedly null lpOverlapped buffer")
+			} else {
+				// The i/o succeeded but the buffer is full.
+				// In theory we should be building up a full packet.
+				// In practice we can get away with just carrying on.
+				n = uint32(unsafe.Sizeof(watch.buf))
+			}
+		case syscall.ERROR_ACCESS_DENIED:
+			// Watched directory was probably removed
+			w.sendEvent(watch.path, watch.mask&sysFSDELETESELF)
+			w.deleteWatch(watch)
+			w.startRead(watch)
+			continue
+		case syscall.ERROR_OPERATION_ABORTED:
+			// CancelIo was called on this handle
+			continue
+		default:
+			w.Errors <- os.NewSyscallError("GetQueuedCompletionPort", e)
+			continue
+		case nil:
+		}
+
+		var offset uint32
+		for {
+			if n == 0 {
+				w.Events <- newEvent("", sysFSQOVERFLOW)
+				w.Errors <- errors.New("short read in readEvents()")
+				break
+			}
+
+			// Point "raw" to the event in the buffer
+			raw := (*syscall.FileNotifyInformation)(unsafe.Pointer(&watch.buf[offset]))
+			buf := (*[syscall.MAX_PATH]uint16)(unsafe.Pointer(&raw.FileName))
+			name := syscall.UTF16ToString(buf[:raw.FileNameLength/2])
+			fullname := filepath.Join(watch.path, name)
+
+			var mask uint64
+			switch raw.Action {
+			case syscall.FILE_ACTION_REMOVED:
+				mask = sysFSDELETESELF
+			case syscall.FILE_ACTION_MODIFIED:
+				mask = sysFSMODIFY
+			case syscall.FILE_ACTION_RENAMED_OLD_NAME:
+				watch.rename = name
+			case syscall.FILE_ACTION_RENAMED_NEW_NAME:
+				if watch.names[watch.rename] != 0 {
+					watch.names[name] |= watch.names[watch.rename]
+					delete(watch.names, watch.rename)
+					mask = sysFSMOVESELF
+				}
+			}
+
+			sendNameEvent := func() {
+				if w.sendEvent(fullname, watch.names[name]&mask) {
+					if watch.names[name]&sysFSONESHOT != 0 {
+						delete(watch.names, name)
+					}
+				}
+			}
+			if raw.Action != syscall.FILE_ACTION_RENAMED_NEW_NAME {
+				sendNameEvent()
+			}
+			if raw.Action == syscall.FILE_ACTION_REMOVED {
+				w.sendEvent(fullname, watch.names[name]&sysFSIGNORED)
+				delete(watch.names, name)
+			}
+			if w.sendEvent(fullname, watch.mask&toFSnotifyFlags(raw.Action)) {
+				if watch.mask&sysFSONESHOT != 0 {
+					watch.mask = 0
+				}
+			}
+			if raw.Action == syscall.FILE_ACTION_RENAMED_NEW_NAME {
+				fullname = filepath.Join(watch.path, watch.rename)
+				sendNameEvent()
+			}
+
+			// Move to the next event in the buffer
+			if raw.NextEntryOffset == 0 {
+				break
+			}
+			offset += raw.NextEntryOffset
+
+			// Error!
+			if offset >= n {
+				w.Errors <- errors.New("Windows system assumed buffer larger than it is, events have likely been missed.")
+				break
+			}
+		}
+
+		if err := w.startRead(watch); err != nil {
+			w.Errors <- err
+		}
+	}
+}
+
+func (w *Watcher) sendEvent(name string, mask uint64) bool {
+	if mask == 0 {
+		return false
+	}
+	event := newEvent(name, uint32(mask))
+	select {
+	case ch := <-w.quit:
+		w.quit <- ch
+	case w.Events <- event:
+	}
+	return true
+}
+
+func toWindowsFlags(mask uint64) uint32 {
+	var m uint32
+	if mask&sysFSACCESS != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_LAST_ACCESS
+	}
+	if mask&sysFSMODIFY != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_LAST_WRITE
+	}
+	if mask&sysFSATTRIB != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_ATTRIBUTES
+	}
+	if mask&(sysFSMOVE|sysFSCREATE|sysFSDELETE) != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_FILE_NAME | syscall.FILE_NOTIFY_CHANGE_DIR_NAME
+	}
+	return m
+}
+
+func toFSnotifyFlags(action uint32) uint64 {
+	switch action {
+	case syscall.FILE_ACTION_ADDED:
+		return sysFSCREATE
+	case syscall.FILE_ACTION_REMOVED:
+		return sysFSDELETE
+	case syscall.FILE_ACTION_MODIFIED:
+		return sysFSMODIFY
+	case syscall.FILE_ACTION_RENAMED_OLD_NAME:
+		return sysFSMOVEDFROM
+	case syscall.FILE_ACTION_RENAMED_NEW_NAME:
+		return sysFSMOVEDTO
+	}
+	return 0
+}

vendor/github.com/gdamore/encoding/.appveyor.yml

@@ -0,0 +1,13 @@
+version: 1.0.{build}
+clone_folder: c:\gopath\src\github.com\gdamore\encoding
+environment:
+  GOPATH: c:\gopath
+build_script:
+- go version
+- go env
+- SET PATH=%LOCALAPPDATA%\atom\bin;%GOPATH%\bin;%PATH%
+- go get -t ./...
+- go build
+- go install ./...
+test_script:
+- go test ./...

vendor/github.com/gdamore/encoding/.travis.yml

@@ -0,0 +1,7 @@
+language: go
+
+go:
+  - 1.9.x
+  - 1.10.x
+  - 1.11.x
+  - tip

vendor/github.com/gdamore/encoding/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
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+      the terms of any separate license agreement you may have executed
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+
+   6. Trademarks. This License does not grant permission to use the trade
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+
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+
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+
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+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/gdamore/encoding/README.md

@@ -0,0 +1,19 @@
+## encoding
+
+[![Linux Status](https://img.shields.io/travis/gdamore/encoding.svg?label=linux)](https://travis-ci.org/gdamore/encoding)
+[![Windows Status](https://img.shields.io/appveyor/ci/gdamore/encoding.svg?label=windows)](https://ci.appveyor.com/project/gdamore/encoding)
+[![Apache License](https://img.shields.io/badge/license-APACHE2-blue.svg)](https://github.com/gdamore/encoding/blob/master/LICENSE)
+[![GoDoc](https://img.shields.io/badge/godoc-reference-blue.svg)](https://godoc.org/github.com/gdamore/encoding)
+[![Go Report Card](http://goreportcard.com/badge/gdamore/encoding)](http://goreportcard.com/report/gdamore/encoding)
+
+Package encoding provides a number of encodings that are missing from the
+standard Go [encoding]("https://godoc.org/golang.org/x/text/encoding") package.
+
+We hope that we can contribute these to the standard Go library someday.  It
+turns out that some of these are useful for dealing with I/O streams coming
+from non-UTF friendly sources.
+
+The UTF8 Encoder is also useful for situations where valid UTF-8 might be
+carried in streams that contain non-valid UTF; in particular I use it for
+helping me cope with terminals that embed escape sequences in otherwise
+valid UTF-8.

vendor/github.com/gdamore/encoding/ascii.go

@@ -0,0 +1,36 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package encoding
+
+import (
+	"golang.org/x/text/encoding"
+)
+
+// ASCII represents the 7-bit US-ASCII scheme.  It decodes directly to
+// UTF-8 without change, as all ASCII values are legal UTF-8.
+// Unicode values less than 128 (i.e. 7 bits) map 1:1 with ASCII.
+// It encodes runes outside of that to 0x1A, the ASCII substitution character.
+var ASCII encoding.Encoding
+
+func init() {
+	amap := make(map[byte]rune)
+	for i := 128; i <= 255; i++ {
+		amap[byte(i)] = RuneError
+	}
+
+	cm := &Charmap{Map: amap}
+	cm.Init()
+	ASCII = cm
+}

vendor/github.com/gdamore/encoding/charmap.go

@@ -0,0 +1,196 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package encoding
+
+import (
+	"sync"
+	"unicode/utf8"
+
+	"golang.org/x/text/encoding"
+	"golang.org/x/text/transform"
+)
+
+const (
+	// RuneError is an alias for the UTF-8 replacement rune, '\uFFFD'.
+	RuneError = '\uFFFD'
+
+	// RuneSelf is the rune below which UTF-8 and the Unicode values are
+	// identical.  Its also the limit for ASCII.
+	RuneSelf = 0x80
+
+	// ASCIISub is the ASCII substitution character.
+	ASCIISub = '\x1a'
+)
+
+// Charmap is a structure for setting up encodings for 8-bit character sets,
+// for transforming between UTF8 and that other character set.  It has some
+// ideas borrowed from golang.org/x/text/encoding/charmap, but it uses a
+// different implementation.  This implementation uses maps, and supports
+// user-defined maps.
+//
+// We do assume that a character map has a reasonable substitution character,
+// and that valid encodings are stable (exactly a 1:1 map) and stateless
+// (that is there is no shift character or anything like that.)  Hence this
+// approach will not work for many East Asian character sets.
+//
+// Measurement shows little or no measurable difference in the performance of
+// the two approaches.  The difference was down to a couple of nsec/op, and
+// no consistent pattern as to which ran faster.  With the conversion to
+// UTF-8 the code takes about 25 nsec/op.  The conversion in the reverse
+// direction takes about 100 nsec/op.  (The larger cost for conversion
+// from UTF-8 is most likely due to the need to convert the UTF-8 byte stream
+// to a rune before conversion.
+//
+type Charmap struct {
+	transform.NopResetter
+	bytes map[rune]byte
+	runes [256][]byte
+	once  sync.Once
+
+	// The map between bytes and runes.  To indicate that a specific
+	// byte value is invalid for a charcter set, use the rune
+	// utf8.RuneError.  Values that are absent from this map will
+	// be assumed to have the identity mapping -- that is the default
+	// is to assume ISO8859-1, where all 8-bit characters have the same
+	// numeric value as their Unicode runes.  (Not to be confused with
+	// the UTF-8 values, which *will* be different for non-ASCII runes.)
+	//
+	// If no values less than RuneSelf are changed (or have non-identity
+	// mappings), then the character set is assumed to be an ASCII
+	// superset, and certain assumptions and optimizations become
+	// available for ASCII bytes.
+	Map map[byte]rune
+
+	// The ReplacementChar is the byte value to use for substitution.
+	// It should normally be ASCIISub for ASCII encodings.  This may be
+	// unset (left to zero) for mappings that are strictly ASCII supersets.
+	// In that case ASCIISub will be assumed instead.
+	ReplacementChar byte
+}
+
+type cmapDecoder struct {
+	transform.NopResetter
+	runes [256][]byte
+}
+
+type cmapEncoder struct {
+	transform.NopResetter
+	bytes   map[rune]byte
+	replace byte
+}
+
+// Init initializes internal values of a character map.  This should
+// be done early, to minimize the cost of allocation of transforms
+// later.  It is not strictly necessary however, as the allocation
+// functions will arrange to call it if it has not already been done.
+func (c *Charmap) Init() {
+	c.once.Do(c.initialize)
+}
+
+func (c *Charmap) initialize() {
+	c.bytes = make(map[rune]byte)
+	ascii := true
+
+	for i := 0; i < 256; i++ {
+		r, ok := c.Map[byte(i)]
+		if !ok {
+			r = rune(i)
+		}
+		if r < 128 && r != rune(i) {
+			ascii = false
+		}
+		if r != RuneError {
+			c.bytes[r] = byte(i)
+		}
+		utf := make([]byte, utf8.RuneLen(r))
+		utf8.EncodeRune(utf, r)
+		c.runes[i] = utf
+	}
+	if ascii && c.ReplacementChar == '\x00' {
+		c.ReplacementChar = ASCIISub
+	}
+}
+
+// NewDecoder returns a Decoder the converts from the 8-bit
+// character set to UTF-8.  Unknown mappings, if any, are mapped
+// to '\uFFFD'.
+func (c *Charmap) NewDecoder() *encoding.Decoder {
+	c.Init()
+	return &encoding.Decoder{Transformer: &cmapDecoder{runes: c.runes}}
+}
+
+// NewEncoder returns a Transformer that converts from UTF8 to the
+// 8-bit character set.  Unknown mappings are mapped to 0x1A.
+func (c *Charmap) NewEncoder() *encoding.Encoder {
+	c.Init()
+	return &encoding.Encoder{
+		Transformer: &cmapEncoder{
+			bytes:   c.bytes,
+			replace: c.ReplacementChar,
+		},
+	}
+}
+
+func (d *cmapDecoder) Transform(dst, src []byte, atEOF bool) (int, int, error) {
+	var e error
+	var ndst, nsrc int
+
+	for _, c := range src {
+		b := d.runes[c]
+		l := len(b)
+
+		if ndst+l > len(dst) {
+			e = transform.ErrShortDst
+			break
+		}
+		for i := 0; i < l; i++ {
+			dst[ndst] = b[i]
+			ndst++
+		}
+		nsrc++
+	}
+	return ndst, nsrc, e
+}
+
+func (d *cmapEncoder) Transform(dst, src []byte, atEOF bool) (int, int, error) {
+	var e error
+	var ndst, nsrc int
+	for nsrc < len(src) {
+		if ndst >= len(dst) {
+			e = transform.ErrShortDst
+			break
+		}
+
+		r, sz := utf8.DecodeRune(src[nsrc:])
+		if r == utf8.RuneError && sz == 1 {
+			// If its inconclusive due to insufficient data in
+			// in the source, report it
+			if !atEOF && !utf8.FullRune(src[nsrc:]) {
+				e = transform.ErrShortSrc
+				break
+			}
+		}
+
+		if c, ok := d.bytes[r]; ok {
+			dst[ndst] = c
+		} else {
+			dst[ndst] = d.replace
+		}
+		nsrc += sz
+		ndst++
+	}
+
+	return ndst, nsrc, e
+}

vendor/github.com/gdamore/encoding/doc.go

@@ -0,0 +1,17 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package encoding provides a few of the encoding structures that are
+// missing from the Go x/text/encoding tree.
+package encoding

vendor/github.com/gdamore/encoding/ebcdic.go

@@ -0,0 +1,273 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package encoding
+
+import (
+	"golang.org/x/text/encoding"
+)
+
+// EBCDIC represents the 8-bit EBCDIC scheme, found in some mainframe
+// environments.  If you don't know what this is, consider yourself lucky.
+var EBCDIC encoding.Encoding
+
+func init() {
+	cm := &Charmap{
+		ReplacementChar: '\x3f',
+		Map: map[byte]rune{
+			// 0x00-0x03 match
+			0x04: RuneError,
+			0x05: '\t',
+			0x06: RuneError,
+			0x07: '\x7f',
+			0x08: RuneError,
+			0x09: RuneError,
+			0x0a: RuneError,
+			// 0x0b-0x13 match
+			0x14: RuneError,
+			0x15: '\x85', // Not in any ISO code
+			0x16: '\x08',
+			0x17: RuneError,
+			// 0x18-0x19 match
+			0x1a: RuneError,
+			0x1b: RuneError,
+			// 0x1c-0x1f match
+			0x20: RuneError,
+			0x21: RuneError,
+			0x22: RuneError,
+			0x23: RuneError,
+			0x24: RuneError,
+			0x25: '\n',
+			0x26: '\x17',
+			0x27: '\x1b',
+			0x28: RuneError,
+			0x29: RuneError,
+			0x2a: RuneError,
+			0x2b: RuneError,
+			0x2c: RuneError,
+			0x2d: '\x05',
+			0x2e: '\x06',
+			0x2f: '\x07',
+			0x30: RuneError,
+			0x31: RuneError,
+			0x32: '\x16',
+			0x33: RuneError,
+			0x34: RuneError,
+			0x35: RuneError,
+			0x36: RuneError,
+			0x37: '\x04',
+			0x38: RuneError,
+			0x39: RuneError,
+			0x3a: RuneError,
+			0x3b: RuneError,
+			0x3c: '\x14',
+			0x3d: '\x15',
+			0x3e: RuneError,
+			0x3f: '\x1a', // also replacement char
+			0x40: ' ',
+			0x41: '\xa0',
+			0x42: RuneError,
+			0x43: RuneError,
+			0x44: RuneError,
+			0x45: RuneError,
+			0x46: RuneError,
+			0x47: RuneError,
+			0x48: RuneError,
+			0x49: RuneError,
+			0x4a: RuneError,
+			0x4b: '.',
+			0x4c: '<',
+			0x4d: '(',
+			0x4e: '+',
+			0x4f: '|',
+			0x50: '&',
+			0x51: RuneError,
+			0x52: RuneError,
+			0x53: RuneError,
+			0x54: RuneError,
+			0x55: RuneError,
+			0x56: RuneError,
+			0x57: RuneError,
+			0x58: RuneError,
+			0x59: RuneError,
+			0x5a: '!',
+			0x5b: '$',
+			0x5c: '*',
+			0x5d: ')',
+			0x5e: ';',
+			0x5f: '¬',
+			0x60: '-',
+			0x61: '/',
+			0x62: RuneError,
+			0x63: RuneError,
+			0x64: RuneError,
+			0x65: RuneError,
+			0x66: RuneError,
+			0x67: RuneError,
+			0x68: RuneError,
+			0x69: RuneError,
+			0x6a: '¦',
+			0x6b: ',',
+			0x6c: '%',
+			0x6d: '_',
+			0x6e: '>',
+			0x6f: '?',
+			0x70: RuneError,
+			0x71: RuneError,
+			0x72: RuneError,
+			0x73: RuneError,
+			0x74: RuneError,
+			0x75: RuneError,
+			0x76: RuneError,
+			0x77: RuneError,
+			0x78: RuneError,
+			0x79: '`',
+			0x7a: ':',
+			0x7b: '#',
+			0x7c: '@',
+			0x7d: '\'',
+			0x7e: '=',
+			0x7f: '"',
+			0x80: RuneError,
+			0x81: 'a',
+			0x82: 'b',
+			0x83: 'c',
+			0x84: 'd',
+			0x85: 'e',
+			0x86: 'f',
+			0x87: 'g',
+			0x88: 'h',
+			0x89: 'i',
+			0x8a: RuneError,
+			0x8b: RuneError,
+			0x8c: RuneError,
+			0x8d: RuneError,
+			0x8e: RuneError,
+			0x8f: '±',
+			0x90: RuneError,
+			0x91: 'j',
+			0x92: 'k',
+			0x93: 'l',
+			0x94: 'm',
+			0x95: 'n',
+			0x96: 'o',
+			0x97: 'p',
+			0x98: 'q',
+			0x99: 'r',
+			0x9a: RuneError,
+			0x9b: RuneError,
+			0x9c: RuneError,
+			0x9d: RuneError,
+			0x9e: RuneError,
+			0x9f: RuneError,
+			0xa0: RuneError,
+			0xa1: '~',
+			0xa2: 's',
+			0xa3: 't',
+			0xa4: 'u',
+			0xa5: 'v',
+			0xa6: 'w',
+			0xa7: 'x',
+			0xa8: 'y',
+			0xa9: 'z',
+			0xaa: RuneError,
+			0xab: RuneError,
+			0xac: RuneError,
+			0xad: RuneError,
+			0xae: RuneError,
+			0xaf: RuneError,
+			0xb0: '^',
+			0xb1: RuneError,
+			0xb2: RuneError,
+			0xb3: RuneError,
+			0xb4: RuneError,
+			0xb5: RuneError,
+			0xb6: RuneError,
+			0xb7: RuneError,
+			0xb8: RuneError,
+			0xb9: RuneError,
+			0xba: '[',
+			0xbb: ']',
+			0xbc: RuneError,
+			0xbd: RuneError,
+			0xbe: RuneError,
+			0xbf: RuneError,
+			0xc0: '{',
+			0xc1: 'A',
+			0xc2: 'B',
+			0xc3: 'C',
+			0xc4: 'D',
+			0xc5: 'E',
+			0xc6: 'F',
+			0xc7: 'G',
+			0xc8: 'H',
+			0xc9: 'I',
+			0xca: '\xad', // NB: soft hyphen
+			0xcb: RuneError,
+			0xcc: RuneError,
+			0xcd: RuneError,
+			0xce: RuneError,
+			0xcf: RuneError,
+			0xd0: '}',
+			0xd1: 'J',
+			0xd2: 'K',
+			0xd3: 'L',
+			0xd4: 'M',
+			0xd5: 'N',
+			0xd6: 'O',
+			0xd7: 'P',
+			0xd8: 'Q',
+			0xd9: 'R',
+			0xda: RuneError,
+			0xdb: RuneError,
+			0xdc: RuneError,
+			0xdd: RuneError,
+			0xde: RuneError,
+			0xdf: RuneError,
+			0xe0: '\\',
+			0xe1: '\u2007', // Non-breaking space
+			0xe2: 'S',
+			0xe3: 'T',
+			0xe4: 'U',
+			0xe5: 'V',
+			0xe6: 'W',
+			0xe7: 'X',
+			0xe8: 'Y',
+			0xe9: 'Z',
+			0xea: RuneError,
+			0xeb: RuneError,
+			0xec: RuneError,
+			0xed: RuneError,
+			0xee: RuneError,
+			0xef: RuneError,
+			0xf0: '0',
+			0xf1: '1',
+			0xf2: '2',
+			0xf3: '3',
+			0xf4: '4',
+			0xf5: '5',
+			0xf6: '6',
+			0xf7: '7',
+			0xf8: '8',
+			0xf9: '9',
+			0xfa: RuneError,
+			0xfb: RuneError,
+			0xfc: RuneError,
+			0xfd: RuneError,
+			0xfe: RuneError,
+			0xff: RuneError,
+		}}
+	cm.Init()
+	EBCDIC = cm
+}

vendor/github.com/gdamore/encoding/go.mod

@@ -0,0 +1,5 @@
+module github.com/gdamore/encoding
+
+go 1.9
+
+require golang.org/x/text v0.3.0

vendor/github.com/gdamore/encoding/go.sum

@@ -0,0 +1,2 @@
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

vendor/github.com/gdamore/encoding/latin1.go

@@ -0,0 +1,33 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package encoding
+
+import (
+	"golang.org/x/text/encoding"
+)
+
+// ISO8859_1 represents the 8-bit ISO8859-1 scheme.  It decodes directly to
+// UTF-8 without change, as all ISO8859-1 values are legal UTF-8.
+// Unicode values less than 256 (i.e. 8 bits) map 1:1 with 8859-1.
+// It encodes runes outside of that to 0x1A, the ASCII substitution character.
+var ISO8859_1 encoding.Encoding
+
+func init() {
+	cm := &Charmap{}
+	cm.Init()
+
+	// 8859-1 is the 8-bit identity map for Unicode.
+	ISO8859_1 = cm
+}

vendor/github.com/gdamore/encoding/latin5.go

@@ -0,0 +1,35 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package encoding
+
+import (
+	"golang.org/x/text/encoding"
+)
+
+// ISO8859_9 represents the 8-bit ISO8859-9 scheme.
+var ISO8859_9 encoding.Encoding
+
+func init() {
+	cm := &Charmap{Map: map[byte]rune{
+		0xD0: 'Ğ',
+		0xDD: 'İ',
+		0xDE: 'Ş',
+		0xF0: 'ğ',
+		0xFD: 'ı',
+		0xFE: 'ş',
+	}}
+	cm.Init()
+	ISO8859_9 = cm
+}

vendor/github.com/gdamore/encoding/utf8.go

@@ -0,0 +1,35 @@
+// Copyright 2015 Garrett D'Amore
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package encoding
+
+import (
+	"golang.org/x/text/encoding"
+)
+
+type validUtf8 struct{}
+
+// UTF8 is an encoding for UTF-8.  All it does is verify that the UTF-8
+// in is valid.  The main reason for its existence is that it will detect
+// and report ErrSrcShort or ErrDstShort, whereas the Nop encoding just
+// passes every byte, blithely.
+var UTF8 encoding.Encoding = validUtf8{}
+
+func (validUtf8) NewDecoder() *encoding.Decoder {
+	return &encoding.Decoder{Transformer: encoding.UTF8Validator}
+}
+
+func (validUtf8) NewEncoder() *encoding.Encoder {
+	return &encoding.Encoder{Transformer: encoding.UTF8Validator}
+}

vendor/github.com/gdamore/tcell/.appveyor.yml

@@ -0,0 +1,13 @@
+version: 1.0.{build}
+clone_folder: c:\gopath\src\github.com\gdamore\tcell
+environment:
+  GOPATH: c:\gopath
+build_script:
+- go version
+- go env
+- SET PATH=%LOCALAPPDATA%\atom\bin;%GOPATH%\bin;%PATH%
+- go get -t ./...
+- go build
+- go install ./...
+test_script:
+- go test ./...

vendor/github.com/gdamore/tcell/.gitignore

@@ -0,0 +1 @@
+coverage.txt

vendor/github.com/gdamore/tcell/.travis.yml

@@ -0,0 +1,15 @@
+language: go
+
+go:
+  - 1.10.x
+  - 1.11.x
+  - master
+
+before_install:
+  - go get -t -v ./...
+
+script:
+  - go test -race -coverprofile=coverage.txt -covermode=atomic
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

vendor/github.com/gdamore/tcell/AUTHORS

@@ -0,0 +1,4 @@
+Garrett D'Amore <garrett@damore.org>
+Zachary Yedidia <zyedidia@gmail.com>
+Junegunn Choi <junegunn.c@gmail.com>
+Staysail Systems, Inc. <info@staysail.tech>

vendor/github.com/gdamore/tcell/LICENSE

@@ -0,0 +1,202 @@
+
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+
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vendor/github.com/gdamore/tcell/README.adoc

@@ -0,0 +1,279 @@
+= tcell
+
+
+image:https://img.shields.io/travis/gdamore/tcell.svg?label=linux[Linux Status,link="https://travis-ci.org/gdamore/tcell"]
+image:https://img.shields.io/appveyor/ci/gdamore/tcell.svg?label=windows[Windows Status,link="https://ci.appveyor.com/project/gdamore/tcell"]
+image:https://img.shields.io/badge/license-APACHE2-blue.svg[Apache License,link="https://github.com/gdamore/tcell/blob/master/LICENSE"]
+image:https://img.shields.io/badge/godoc-reference-blue.svg[GoDoc,link="https://godoc.org/github.com/gdamore/tcell"]
+image:http://goreportcard.com/badge/gdamore/tcell[Go Report Card,link="http://goreportcard.com/report/gdamore/tcell"]
+image:https://img.shields.io/discord/639503822733180969?label=discord[Discord,link="https://discord.gg/urTTxDN"]
+image:https://codecov.io/gh/gdamore/tcell/branch/master/graph/badge.svg[codecov,link="https://codecov.io/gh/gdamore/tcell"]
+
+[cols="2",grid="none"]
+|===
+|_Tcell_ is a _Go_ package that provides a cell based view for text terminals, like _xterm_.
+It was inspired by _termbox_, but includes many additional improvements.
+a|[.right]
+image::logos/tcell.png[float="right"]
+|===
+
+## Examples
+
+* https://github.com/gdamore/proxima5[proxima5] - space shooter (https://youtu.be/jNxKTCmY_bQ[video])
+* https://github.com/gdamore/govisor[govisor] - service management UI (http://2.bp.blogspot.com/--OsvnfzSNow/Vf7aqMw3zXI/AAAAAAAAARo/uOMtOvw4Sbg/s1600/Screen%2BShot%2B2015-09-20%2Bat%2B9.08.41%2BAM.png[screenshot])
+* mouse demo - included mouse test (http://2.bp.blogspot.com/-fWvW5opT0es/VhIdItdKqJI/AAAAAAAAATE/7Ojc0L1SpB0/s1600/Screen%2BShot%2B2015-10-04%2Bat%2B11.47.13%2BPM.png[screenshot])
+* https://github.com/gdamore/gomatrix[gomatrix] - converted from Termbox
+* https://github.com/zyedidia/micro/[micro] - lightweight text editor with syntax-highlighting and themes
+* https://github.com/viktomas/godu[godu] - simple golang utility helping to discover large files/folders.
+* https://github.com/rivo/tview[tview] - rich interactive widgets for terminal UIs
+* https://github.com/marcusolsson/tui-go[tui-go] - UI library for terminal apps (_deprecated_)
+* https://github.com/rgm3/gomandelbrot[gomandelbrot] - Mandelbrot!
+* https://github.com/senorprogrammer/wtf[WTF]- Personal information dashboard for your terminal
+* https://github.com/browsh-org/browsh[browsh] - A fully-modern text-based browser, rendering to TTY and browsers (https://www.youtube.com/watch?v=HZq86XfBoRo[video])
+* https://github.com/sachaos/go-life[go-life] - Conway's Game of Life.
+* https://github.com/gcla/gowid[gowid] - compositional widgets for terminal UIs, inspired by urwid
+* https://termshark.io[termshark] - a terminal UI for tshark, inspired by Wireshark, built on gowid
+* https://github.com/MichaelS11/go-tetris[go-tetris] - Go Tetris with AI option
+* https://github.com/junegunn/fzf[fzf] - A command-line fuzzy finder
+* https://github.com/esimov/ascii-fluid[ascii-fluid] - A terminal based ASCII fluid simulation controlled by webcam
+* https://gitlab.com/tslocum/cbind[cbind] - Provides key event encoding, decoding and handling
+* https://github.com/spinzed/tpong[tpong] - The old-school Pong remade in terminal
+
+## Pure Go Terminfo Database
+
+_Tcell_ includes a full parser and expander for terminfo capability strings,
+so that it can avoid hard coding escape strings for formatting.  It also favors
+portability, and includes support for all POSIX systems.
+
+The database is also flexible & extensible, and can modified by either running
+a program to build the entire database, or an entry for just a single terminal.
+
+## More Portable
+
+_Tcell_ is portable to a wide variety of systems.
+_Tcell_ is believed
+to work with all of the systems officially supported by golang with
+the exception of nacl (which lacks any kind of a terminal interface).
+(Plan9 is not supported by _Tcell_, but it is experimental status only
+in golang.)  _Tcell_ is pure Go, without any need for CGO.
+
+## No Async IO
+
+_Tcell_ is able to operate without requiring `SIGIO` signals (unlike _termbox_),
+or asynchronous I/O, and can instead use standard Go file
+objects and Go routines.
+This means it should be safe, especially for
+use with programs that use exec, or otherwise need to manipulate the
+tty streams.
+This model is also much closer to idiomatic Go, leading
+to fewer surprises.
+
+## Rich Unicode & non-Unicode support
+
+_Tcell_ includes enhanced support for Unicode, including wide characters and
+combining characters, provided your terminal can support them.
+Note that
+Windows terminals generally don't support the full Unicode repertoire.
+
+It will also convert to and from Unicode locales, so that the program
+can work with UTF-8 internally, and get reasonable output in other locales.
+_Tcell_ tries hard to convert to native characters on both input and output, and
+on output _Tcell_ even makes use of the alternate character set to facilitate
+drawing certain characters.
+
+## More Function Keys
+
+_Tcell_ also has richer support for a larger number of special keys that some terminals can send.
+
+## Better Color Handling
+
+_Tcell_ will respect your terminal's color space as specified within your terminfo
+entries, so that for example attempts to emit color sequences on VT100 terminals
+won't result in unintended consequences.
+
+In legacy Windows mode, _Tcell_ supports 16 colors, bold, dim, and reverse,
+instead of just termbox's 8 colors with reverse.  (Note that there is some
+conflation with bold/dim and colors.)
+Modern Windows 10 can benefit from much richer colors however.
+
+_Tcell_ maps 16 colors down to 8, for terminals that need it.
+(The upper 8 colors are just brighter versions of the lower 8.)
+
+## Better Mouse Support
+
+_Tcell_ supports enhanced mouse tracking mode, so your application can receive
+regular mouse motion events, and wheel events, if your terminal supports it.
+
+(Note: The Windows 10 Terminal application suffers from a flaw in this regard,
+and does not support mouse interaction.  The stock Windows 10 console host
+fired up with cmd.exe or PowerShell works fine however.)
+
+## _Termbox_ Compatibility
+
+A compatibility layer for _termbox_ is provided in the `compat` directory.
+To use it, try importing `github.com/gdamore/tcell/termbox` instead.
+Most _termbox-go_ programs will probably work without further modification.
+
+## Working With Unicode
+
+Internally Tcell uses UTF-8, just like Go.
+However, Tcell understands how to
+convert to and from other character sets, using the capabilities of
+the `golang.org/x/text/encoding packages`.
+Your application must supply
+them, as the full set of the most common ones bloats the program by about 2MB.
+If you're lazy, and want them all anyway, see the `encoding` sub-directory.
+
+## Wide & Combining Characters
+
+The `SetContent()` API takes a primary rune, and an optional list of combining runes.
+If any of the runes is a wide (East Asian) rune occupying two cells,
+then the library will skip output from the following cell, but care must be
+taken in the application to avoid explicitly attempting to set content in the
+next cell, otherwise the results are undefined.  (Normally wide character
+is displayed, and the other character is not; do not depend on that behavior.)
+
+Experience has shown that the vanilla Windows 8 console application does not
+support any of these characters properly, but at least some options like
+_ConEmu_ do support Wide characters.
+
+## Colors
+
+_Tcell_ assumes the ANSI/XTerm color model, including the 256 color map that
+XTerm uses when it supports 256 colors.  The terminfo guidance will be
+honored, with respect to the number of colors supported.  Also, only
+terminals which expose ANSI style `setaf` and `setab` will support color;
+if you have a color terminal that only has `setf` and `setb`, please let me
+know; it wouldn't be hard to add that if there is need.
+
+## 24-bit Color
+
+_Tcell_ _supports true color_!  (That is, if your terminal can support it,
+_Tcell_ can accurately display 24-bit color.)
+
+To use 24-bit color, you need to use a terminal that supports it.  Modern
+xterm and similar teminal emulators can support this.  As terminfo lacks any
+way to describe this capability, we fabricate the capability for
+terminals with names ending in `*-truecolor`.  The stock distribution ships
+with a database that defines `xterm-truecolor`.
+To try it out, set your
+`TERM` variable to `xterm-truecolor`.
+
+When using TrueColor, programs will display the colors that the programmer
+intended, overriding any "`themes`" you may have set in your terminal
+emulator.  (For some cases, accurate color fidelity is more important
+than respecting themes.  For other cases, such as typical text apps that
+only use a few colors, its more desirable to respect the themes that
+the user has established.)
+
+If you find this undesirable, you can either use a `TERM` variable
+that lacks the `TRUECOLOR` setting, or set `TCELL_TRUECOLOR=disable` in your
+environment.
+
+## Performance
+
+Reasonable attempts have been made to minimize sending data to terminals,
+avoiding repeated sequences or drawing the same cell on refresh updates.
+
+## Terminfo
+
+(Not relevent for Windows users.)
+
+The Terminfo implementation operates with two forms of database.  The first
+is the built-in go database, which contains a number of real database entries
+that are compiled into the program directly.  This should minimize calling
+out to database file searches.
+
+The second is in the form of JSON files, that contain the same information,
+which can be located either by the `$TCELLDB` environment file, `$HOME/.tcelldb`,
+or is located in the Go source directory as `database.json`.
+
+These files (both the Go and the JSON files) can be generated using the
+mkinfo.go program.  If you need to regnerate the entire set for some reason,
+run the mkdatabase.sh file.  The generation uses the infocmp(1) program on
+the system to collect the necessary information.
+
+The `mkinfo.go` program can also be used to generate specific database entries
+for named terminals, in case your favorite terminal is missing.  (If you
+find that this is the case, please let me know and I'll try to add it!)
+
+_Tcell_ requires that the terminal support the `cup` mode of cursor addressing.
+Terminals without absolute cursor addressability are not supported.
+This is unlikely to be a problem; such terminals have not been mass produced
+since the early 1970s.
+
+## Mouse Support
+
+Mouse support is detected via the `kmous` terminfo variable, however,
+enablement/disablement and decoding mouse events is done using hard coded
+sequences based on the XTerm X11 model.  As of this writing all popular
+terminals with mouse tracking support this model.  (Full terminfo support
+is not possible as terminfo sequences are not defined.)
+
+On Windows, the mouse works normally.
+
+Mouse wheel buttons on various terminals are known to work, but the support
+in terminal emulators, as well as support for various buttons and
+live mouse tracking, varies widely.  Modern _xterm_, macOS _Terminal_, and _iTerm_ all work well.
+
+## Testablity
+
+There is a `SimulationScreen`, that can be used to simulate a real screen
+for automated testing.  The supplied tests do this.  The simulation contains
+event delivery, screen resizing support, and capabilities to inject events
+and examine "`physical`" screen contents.
+
+## Platforms
+
+### POSIX (Linux, FreeBSD, macOS, Solaris, etc.)
+
+For mainstream systems with a suitably well defined system call interface
+to tty settings, everything works using pure Go.
+
+For the remainder (right now means only Solaris/illumos) we use POSIX function
+calls to manage termios, which implies that CGO is required on those platforms.
+
+### Windows
+
+Windows console mode applications are supported.  Unfortunately _mintty_
+and other _cygwin_ style applications are not supported.
+
+Modern console applications like ConEmu, as well as the Windows 10
+console itself, support all the good features (resize, mouse tracking, etc.)
+
+I haven't figured out how to cleanly resolve the dichotomy between cygwin
+style termios and the Windows Console API; it seems that perhaps nobody else
+has either.  If anyone has suggestions, let me know!  Really, if you're
+using a Windows application, you should use the native Windows console or a
+fully compatible console implementation.
+
+### Plan9 and Native Client (Nacl)
+
+The nacl and plan9 platforms won't work, but compilation stubs are supplied
+for folks that want to include parts of this in software targetting those
+platforms.  The Simulation screen works, but as Tcell doesn't know how to
+allocate a real screen object on those platforms, `NewScreen()` will fail.
+
+If anyone has wisdom about how to improve support for either of these,
+please let me know.  PRs are especially welcome.
+
+### Commercial Support
+
+_Tcell_ is absolutely free, but if you want to obtain commercial, professional support, there are options.
+
+[cols="2",align="center",frame="none", grid="none"]
+|===
+^.^|
+image:logos/tidelift.png[100,100]
+a|
+https://tidelift.com/[Tidelift] subscriptions include support for _Tcell_, as well as many other open source packages.
+
+^.^|
+image:logos/staysail.png[100,100]
+a|
+mailto:info@staysail.tech[Staysail Systems, Inc.] offers direct support, and custom development around _Tcell_ on an hourly basis.
+
+^.^|
+image:logos/patreon.png[100,100]
+a|I also welcome donations at https://www.patreon.com/gedamore/[Patreon], if you just want to make a contribution.
+|===

vendor/github.com/gdamore/tcell/attr.go

@@ -0,0 +1,33 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+// AttrMask represents a mask of text attributes, apart from color.
+// Note that support for attributes may vary widely across terminals.
+type AttrMask int
+
+// Attributes are not colors, but affect the display of text.  They can
+// be combined.
+const (
+	AttrBold AttrMask = 1 << (25 + iota)
+	AttrBlink
+	AttrReverse
+	AttrUnderline
+	AttrDim
+	AttrItalic
+	AttrNone AttrMask = 0 // Just normal text.
+)
+
+const attrAll = AttrBold | AttrBlink | AttrReverse | AttrUnderline | AttrDim | AttrItalic

vendor/github.com/gdamore/tcell/cell.go

@@ -0,0 +1,177 @@
+// Copyright 2019 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	runewidth "github.com/mattn/go-runewidth"
+)
+
+type cell struct {
+	currMain  rune
+	currComb  []rune
+	currStyle Style
+	lastMain  rune
+	lastStyle Style
+	lastComb  []rune
+	width     int
+}
+
+// CellBuffer represents a two dimensional array of character cells.
+// This is primarily intended for use by Screen implementors; it
+// contains much of the common code they need.  To create one, just
+// declare a variable of its type; no explicit initialization is necessary.
+//
+// CellBuffer is not thread safe.
+type CellBuffer struct {
+	w     int
+	h     int
+	cells []cell
+}
+
+// SetContent sets the contents (primary rune, combining runes,
+// and style) for a cell at a given location.
+func (cb *CellBuffer) SetContent(x int, y int,
+	mainc rune, combc []rune, style Style) {
+
+	if x >= 0 && y >= 0 && x < cb.w && y < cb.h {
+		c := &cb.cells[(y*cb.w)+x]
+
+		c.currComb = append([]rune{}, combc...)
+
+		if c.currMain != mainc {
+			c.width = runewidth.RuneWidth(mainc)
+		}
+		c.currMain = mainc
+		c.currStyle = style
+	}
+}
+
+// GetContent returns the contents of a character cell, including the
+// primary rune, any combining character runes (which will usually be
+// nil), the style, and the display width in cells.  (The width can be
+// either 1, normally, or 2 for East Asian full-width characters.)
+func (cb *CellBuffer) GetContent(x, y int) (rune, []rune, Style, int) {
+	var mainc rune
+	var combc []rune
+	var style Style
+	var width int
+	if x >= 0 && y >= 0 && x < cb.w && y < cb.h {
+		c := &cb.cells[(y*cb.w)+x]
+		mainc, combc, style = c.currMain, c.currComb, c.currStyle
+		if width = c.width; width == 0 || mainc < ' ' {
+			width = 1
+			mainc = ' '
+		}
+	}
+	return mainc, combc, style, width
+}
+
+// Size returns the (width, height) in cells of the buffer.
+func (cb *CellBuffer) Size() (int, int) {
+	return cb.w, cb.h
+}
+
+// Invalidate marks all characters within the buffer as dirty.
+func (cb *CellBuffer) Invalidate() {
+	for i := range cb.cells {
+		cb.cells[i].lastMain = rune(0)
+	}
+}
+
+// Dirty checks if a character at the given location needs an
+// to be refreshed on the physical display.  This returns true
+// if the cell content is different since the last time it was
+// marked clean.
+func (cb *CellBuffer) Dirty(x, y int) bool {
+	if x >= 0 && y >= 0 && x < cb.w && y < cb.h {
+		c := &cb.cells[(y*cb.w)+x]
+		if c.lastMain == rune(0) {
+			return true
+		}
+		if c.lastMain != c.currMain {
+			return true
+		}
+		if c.lastStyle != c.currStyle {
+			return true
+		}
+		if len(c.lastComb) != len(c.currComb) {
+			return true
+		}
+		for i := range c.lastComb {
+			if c.lastComb[i] != c.currComb[i] {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// SetDirty is normally used to indicate that a cell has
+// been displayed (in which case dirty is false), or to manually
+// force a cell to be marked dirty.
+func (cb *CellBuffer) SetDirty(x, y int, dirty bool) {
+	if x >= 0 && y >= 0 && x < cb.w && y < cb.h {
+		c := &cb.cells[(y*cb.w)+x]
+		if dirty {
+			c.lastMain = rune(0)
+		} else {
+			if c.currMain == rune(0) {
+				c.currMain = ' '
+			}
+			c.lastMain = c.currMain
+			c.lastComb = c.currComb
+			c.lastStyle = c.currStyle
+		}
+	}
+}
+
+// Resize is used to resize the cells array, with different dimensions,
+// while preserving the original contents.  The cells will be invalidated
+// so that they can be redrawn.
+func (cb *CellBuffer) Resize(w, h int) {
+
+	if cb.h == h && cb.w == w {
+		return
+	}
+
+	newc := make([]cell, w*h)
+	for y := 0; y < h && y < cb.h; y++ {
+		for x := 0; x < w && x < cb.w; x++ {
+			oc := &cb.cells[(y*cb.w)+x]
+			nc := &newc[(y*w)+x]
+			nc.currMain = oc.currMain
+			nc.currComb = oc.currComb
+			nc.currStyle = oc.currStyle
+			nc.width = oc.width
+			nc.lastMain = rune(0)
+		}
+	}
+	cb.cells = newc
+	cb.h = h
+	cb.w = w
+}
+
+// Fill fills the entire cell buffer array with the specified character
+// and style.  Normally choose ' ' to clear the screen.  This API doesn't
+// support combining characters, or characters with a width larger than one.
+func (cb *CellBuffer) Fill(r rune, style Style) {
+	for i := range cb.cells {
+		c := &cb.cells[i]
+		c.currMain = r
+		c.currComb = nil
+		c.currStyle = style
+		c.width = 1
+	}
+}

vendor/github.com/gdamore/tcell/charset_stub.go

@@ -0,0 +1,21 @@
+// +build plan9 nacl
+
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+func getCharset() string {
+	return ""
+}

vendor/github.com/gdamore/tcell/charset_unix.go

@@ -0,0 +1,49 @@
+// +build !windows,!nacl,!plan9
+
+// Copyright 2016 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"os"
+	"strings"
+)
+
+func getCharset() string {
+	// Determine the character set.  This can help us later.
+	// Per POSIX, we search for LC_ALL first, then LC_CTYPE, and
+	// finally LANG.  First one set wins.
+	locale := ""
+	if locale = os.Getenv("LC_ALL"); locale == "" {
+		if locale = os.Getenv("LC_CTYPE"); locale == "" {
+			locale = os.Getenv("LANG")
+		}
+	}
+	if locale == "POSIX" || locale == "C" {
+		return "US-ASCII"
+	}
+	if i := strings.IndexRune(locale, '@'); i >= 0 {
+		locale = locale[:i]
+	}
+	if i := strings.IndexRune(locale, '.'); i >= 0 {
+		locale = locale[i+1:]
+	} else {
+		// Default assumption, and on Linux we can see LC_ALL
+		// without a character set, which we assume implies UTF-8.
+		return "UTF-8"
+	}
+	// XXX: add support for aliases
+	return locale
+}

vendor/github.com/gdamore/tcell/charset_windows.go

@@ -0,0 +1,21 @@
+// +build windows
+
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+func getCharset() string {
+	return "UTF-16"
+}

vendor/github.com/gdamore/tcell/colorfit.go

@@ -0,0 +1,52 @@
+// Copyright 2016 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"github.com/lucasb-eyer/go-colorful"
+	"math"
+)
+
+// FindColor attempts to find a given color, or the best match possible for it,
+// from the palette given.  This is an expensive operation, so results should
+// be cached by the caller.
+func FindColor(c Color, palette []Color) Color {
+	match := ColorDefault
+	dist := float64(0)
+	r, g, b := c.RGB()
+	c1 := colorful.Color{
+		R: float64(r) / 255.0,
+		G: float64(g) / 255.0,
+		B: float64(b) / 255.0,
+	}
+	for _, d := range palette {
+		r, g, b = d.RGB()
+		c2 := colorful.Color{
+			R: float64(r) / 255.0,
+			G: float64(g) / 255.0,
+			B: float64(b) / 255.0,
+		}
+		// CIE94 is more accurate, but really really expensive.
+		nd := c1.DistanceCIE76(c2)
+		if math.IsNaN(nd) {
+			nd = math.Inf(1)
+		}
+		if match == ColorDefault || nd < dist {
+			match = d
+			dist = nd
+		}
+	}
+	return match
+}

vendor/github.com/gdamore/tcell/console_stub.go

@@ -0,0 +1,23 @@
+// +build !windows
+
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+// NewConsoleScreen returns a console based screen.  This platform
+// doesn't have support for any, so it returns nil and a suitable error.
+func NewConsoleScreen() (Screen, error) {
+	return nil, ErrNoScreen
+}

vendor/github.com/gdamore/tcell/doc.go

@@ -0,0 +1,48 @@
+// Copyright 2018 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package tcell provides a lower-level, portable API for building
+// programs that interact with terminals or consoles.  It works with
+// both common (and many uncommon!) terminals or terminal emulators,
+// and Windows console implementations.
+//
+// It provides support for up to 256 colors, text attributes, and box drawing
+// elements.  A database of terminals built from a real terminfo database
+// is provided, along with code to generate new database entries.
+//
+// Tcell offers very rich support for mice, dependent upon the terminal
+// of course.  (Windows, XTerm, and iTerm 2 are known to work very well.)
+//
+// If the environment is not Unicode by default, such as an ISO8859 based
+// locale or GB18030, Tcell can convert input and output, so that your
+// terminal can operate in whatever locale is most convenient, while the
+// application program can just assume "everything is UTF-8".  Reasonable
+// defaults are used for updating characters to something suitable for
+// display.  Unicode box drawing characters will be converted to use the
+// alternate character set of your terminal, if native conversions are
+// not available.  If no ACS is available, then some ASCII fallbacks will
+// be used.
+//
+// Note that support for non-UTF-8 locales (other than C)  must be enabled
+// by the application using RegisterEncoding() -- we don't have them all
+// enabled by default to avoid bloating the application unneccessarily.
+// (These days UTF-8 is good enough for almost everyone, and nobody should
+// be using legacy locales anymore.)  Also, actual glyphs for various code
+// point will only be displayed if your terminal or emulator (or the font
+// the emulator is using) supports them.
+//
+// A rich set of keycodes is supported, with support for up to 65 function
+// keys, and various other special keys.
+//
+package tcell

vendor/github.com/gdamore/tcell/encoding.go

@@ -0,0 +1,139 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"strings"
+	"sync"
+
+	"golang.org/x/text/encoding"
+
+	gencoding "github.com/gdamore/encoding"
+)
+
+var encodings map[string]encoding.Encoding
+var encodingLk sync.Mutex
+var encodingFallback EncodingFallback = EncodingFallbackFail
+
+// RegisterEncoding may be called by the application to register an encoding.
+// The presence of additional encodings will facilitate application usage with
+// terminal environments where the I/O subsystem does not support Unicode.
+//
+// Windows systems use Unicode natively, and do not need any of the encoding
+// subsystem when using Windows Console screens.
+//
+// Please see the Go documentation for golang.org/x/text/encoding -- most of
+// the common ones exist already as stock variables.  For example, ISO8859-15
+// can be registered using the following code:
+//
+//   import "golang.org/x/text/encoding/charmap"
+//
+//     ...
+//     RegisterEncoding("ISO8859-15", charmap.ISO8859_15)
+//
+// Aliases can be registered as well, for example "8859-15" could be an alias
+// for "ISO8859-15".
+//
+// For POSIX systems, the tcell package will check the environment variables
+// LC_ALL, LC_CTYPE,  and LANG (in that order) to determine the character set.
+// These are expected to have the following pattern:
+//
+//	 $language[.$codeset[@$variant]
+//
+// We extract only the $codeset part, which will usually be something like
+// UTF-8 or ISO8859-15 or KOI8-R.  Note that if the locale is either "POSIX"
+// or "C", then we assume US-ASCII (the POSIX 'portable character set'
+// and assume all other characters are somehow invalid.)
+//
+// Modern POSIX systems and terminal emulators may use UTF-8, and for those
+// systems, this API is also unnecessary.  For example, Darwin (MacOS X) and
+// modern Linux running modern xterm generally will out of the box without
+// any of this.  Use of UTF-8 is recommended when possible, as it saves
+// quite a lot processing overhead.
+//
+// Note that some encodings are quite large (for example GB18030 which is a
+// superset of Unicode) and so the application size can be expected ot
+// increase quite a bit as each encoding is added.  The East Asian encodings
+// have been seen to add 100-200K per encoding to the application size.
+//
+func RegisterEncoding(charset string, enc encoding.Encoding) {
+	encodingLk.Lock()
+	charset = strings.ToLower(charset)
+	encodings[charset] = enc
+	encodingLk.Unlock()
+}
+
+// EncodingFallback describes how the system behavees when the locale
+// requires a character set that we do not support.  The system always
+// supports UTF-8 and US-ASCII. On Windows consoles, UTF-16LE is also
+// supported automatically.  Other character sets must be added using the
+// RegisterEncoding API.  (A large group of nearly all of them can be
+// added using the RegisterAll function in the encoding sub package.)
+type EncodingFallback int
+
+const (
+	// EncodingFallbackFail behavior causes GetEncoding to fail
+	// when it cannot find an encoding.
+	EncodingFallbackFail = iota
+
+	// EncodingFallbackASCII behaviore causes GetEncoding to fall back
+	// to a 7-bit ASCII encoding, if no other encoding can be found.
+	EncodingFallbackASCII
+
+	// EncodingFallbackUTF8 behavior causes GetEncoding to assume
+	// UTF8 can pass unmodified upon failure.  Note that this behavior
+	// is not recommended, unless you are sure your terminal can cope
+	// with real UTF8 sequences.
+	EncodingFallbackUTF8
+)
+
+// SetEncodingFallback changes the behavior of GetEncoding when a suitable
+// encoding is not found.  The default is EncodingFallbackFail, which
+// causes GetEncoding to simply return nil.
+func SetEncodingFallback(fb EncodingFallback) {
+	encodingLk.Lock()
+	encodingFallback = fb
+	encodingLk.Unlock()
+}
+
+// GetEncoding is used by Screen implementors who want to locate an encoding
+// for the given character set name.  Note that this will return nil for
+// either the Unicode (UTF-8) or ASCII encodings, since we don't use
+// encodings for them but instead have our own native methods.
+func GetEncoding(charset string) encoding.Encoding {
+	charset = strings.ToLower(charset)
+	encodingLk.Lock()
+	defer encodingLk.Unlock()
+	if enc, ok := encodings[charset]; ok {
+		return enc
+	}
+	switch encodingFallback {
+	case EncodingFallbackASCII:
+		return gencoding.ASCII
+	case EncodingFallbackUTF8:
+		return encoding.Nop
+	}
+	return nil
+}
+
+func init() {
+	// We always support UTF-8 and ASCII.
+	encodings = make(map[string]encoding.Encoding)
+	encodings["utf-8"] = gencoding.UTF8
+	encodings["utf8"] = gencoding.UTF8
+	encodings["us-ascii"] = gencoding.ASCII
+	encodings["ascii"] = gencoding.ASCII
+	encodings["iso646"] = gencoding.ASCII
+}

vendor/github.com/gdamore/tcell/errors.go

@@ -0,0 +1,73 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"errors"
+	"time"
+
+	"github.com/gdamore/tcell/terminfo"
+)
+
+var (
+	// ErrTermNotFound indicates that a suitable terminal entry could
+	// not be found.  This can result from either not having TERM set,
+	// or from the TERM failing to support certain minimal functionality,
+	// in particular absolute cursor addressability (the cup capability)
+	// is required.  For example, legacy "adm3" lacks this capability,
+	// whereas the slightly newer "adm3a" supports it.  This failure
+	// occurs most often with "dumb".
+	ErrTermNotFound = terminfo.ErrTermNotFound
+
+	// ErrNoScreen indicates that no suitable screen could be found.
+	// This may result from attempting to run on a platform where there
+	// is no support for either termios or console I/O (such as nacl),
+	// or from running in an environment where there is no access to
+	// a suitable console/terminal device.  (For example, running on
+	// without a controlling TTY or with no /dev/tty on POSIX platforms.)
+	ErrNoScreen = errors.New("no suitable screen available")
+
+	// ErrNoCharset indicates that the locale environment the
+	// program is not supported by the program, because no suitable
+	// encoding was found for it.  This problem never occurs if
+	// the environment is UTF-8 or UTF-16.
+	ErrNoCharset = errors.New("character set not supported")
+
+	// ErrEventQFull indicates that the event queue is full, and
+	// cannot accept more events.
+	ErrEventQFull = errors.New("event queue full")
+)
+
+// An EventError is an event representing some sort of error, and carries
+// an error payload.
+type EventError struct {
+	t   time.Time
+	err error
+}
+
+// When returns the time when the event was created.
+func (ev *EventError) When() time.Time {
+	return ev.t
+}
+
+// Error implements the error.
+func (ev *EventError) Error() string {
+	return ev.err.Error()
+}
+
+// NewEventError creates an ErrorEvent with the given error payload.
+func NewEventError(err error) *EventError {
+	return &EventError{t: time.Now(), err: err}
+}

vendor/github.com/gdamore/tcell/event.go

@@ -0,0 +1,53 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"time"
+)
+
+// Event is a generic interface used for passing around Events.
+// Concrete types follow.
+type Event interface {
+	// When reports the time when the event was generated.
+	When() time.Time
+}
+
+// EventTime is a simple base event class, suitable for easy reuse.
+// It can be used to deliver actual timer events as well.
+type EventTime struct {
+	when time.Time
+}
+
+// When returns the time stamp when the event occurred.
+func (e *EventTime) When() time.Time {
+	return e.when
+}
+
+// SetEventTime sets the time of occurrence for the event.
+func (e *EventTime) SetEventTime(t time.Time) {
+	e.when = t
+}
+
+// SetEventNow sets the time of occurrence for the event to the current time.
+func (e *EventTime) SetEventNow() {
+	e.SetEventTime(time.Now())
+}
+
+// EventHandler is anything that handles events.  If the handler has
+// consumed the event, it should return true.  False otherwise.
+type EventHandler interface {
+	HandleEvent(Event) bool
+}

vendor/github.com/gdamore/tcell/go.mod

@@ -0,0 +1,11 @@
+module github.com/gdamore/tcell
+
+go 1.12
+
+require (
+	github.com/gdamore/encoding v1.0.0
+	github.com/lucasb-eyer/go-colorful v1.0.3
+	github.com/mattn/go-runewidth v0.0.7
+	golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756
+	golang.org/x/text v0.3.0
+)

vendor/github.com/gdamore/tcell/go.sum

@@ -0,0 +1,10 @@
+github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
+github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-runewidth v0.0.7 h1:Ei8KR0497xHyKJPAv59M1dkC+rOZCMBJ+t3fZ+twI54=
+github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756 h1:9nuHUbU8dRnRRfj9KjWUVrJeoexdbeMjttk6Oh1rD10=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

vendor/github.com/gdamore/tcell/interrupt.go

@@ -0,0 +1,41 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"time"
+)
+
+// EventInterrupt is a generic wakeup event.  Its can be used to
+// to request a redraw.  It can carry an arbitrary payload, as well.
+type EventInterrupt struct {
+	t time.Time
+	v interface{}
+}
+
+// When returns the time when this event was created.
+func (ev *EventInterrupt) When() time.Time {
+	return ev.t
+}
+
+// Data is used to obtain the opaque event payload.
+func (ev *EventInterrupt) Data() interface{} {
+	return ev.v
+}
+
+// NewEventInterrupt creates an EventInterrupt with the given payload.
+func NewEventInterrupt(data interface{}) *EventInterrupt {
+	return &EventInterrupt{t: time.Now(), v: data}
+}

vendor/github.com/gdamore/tcell/key.go

@@ -0,0 +1,464 @@
+// Copyright 2016 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"fmt"
+	"strings"
+	"time"
+)
+
+// EventKey represents a key press.  Usually this is a key press followed
+// by a key release, but since terminal programs don't have a way to report
+// key release events, we usually get just one event.  If a key is held down
+// then the terminal may synthesize repeated key presses at some predefined
+// rate.  We have no control over that, nor visibility into it.
+//
+// In some cases, we can have a modifier key, such as ModAlt, that can be
+// generated with a key press.  (This usually is represented by having the
+// high bit set, or in some cases, by sending an ESC prior to the rune.)
+//
+// If the value of Key() is KeyRune, then the actual key value will be
+// available with the Rune() method.  This will be the case for most keys.
+// In most situations, the modifiers will not be set.  For example, if the
+// rune is 'A', this will be reported without the ModShift bit set, since
+// really can't tell if the Shift key was pressed (it might have been CAPSLOCK,
+// or a terminal that only can send capitals, or keyboard with separate
+// capital letters from lower case letters).
+//
+// Generally, terminal applications have far less visibility into keyboard
+// activity than graphical applications.  Hence, they should avoid depending
+// overly much on availability of modifiers, or the availability of any
+// specific keys.
+type EventKey struct {
+	t   time.Time
+	mod ModMask
+	key Key
+	ch  rune
+}
+
+// When returns the time when this Event was created, which should closely
+// match the time when the key was pressed.
+func (ev *EventKey) When() time.Time {
+	return ev.t
+}
+
+// Rune returns the rune corresponding to the key press, if it makes sense.
+// The result is only defined if the value of Key() is KeyRune.
+func (ev *EventKey) Rune() rune {
+	return ev.ch
+}
+
+// Key returns a virtual key code.  We use this to identify specific key
+// codes, such as KeyEnter, etc.  Most control and function keys are reported
+// with unique Key values.  Normal alphanumeric and punctuation keys will
+// generally return KeyRune here; the specific key can be further decoded
+// using the Rune() function.
+func (ev *EventKey) Key() Key {
+	return ev.key
+}
+
+// Modifiers returns the modifiers that were present with the key press.  Note
+// that not all platforms and terminals support this equally well, and some
+// cases we will not not know for sure.  Hence, applications should avoid
+// using this in most circumstances.
+func (ev *EventKey) Modifiers() ModMask {
+	return ev.mod
+}
+
+// KeyNames holds the written names of special keys. Useful to echo back a key
+// name, or to look up a key from a string value.
+var KeyNames = map[Key]string{
+	KeyEnter:          "Enter",
+	KeyBackspace:      "Backspace",
+	KeyTab:            "Tab",
+	KeyBacktab:        "Backtab",
+	KeyEsc:            "Esc",
+	KeyBackspace2:     "Backspace2",
+	KeyDelete:         "Delete",
+	KeyInsert:         "Insert",
+	KeyUp:             "Up",
+	KeyDown:           "Down",
+	KeyLeft:           "Left",
+	KeyRight:          "Right",
+	KeyHome:           "Home",
+	KeyEnd:            "End",
+	KeyUpLeft:         "UpLeft",
+	KeyUpRight:        "UpRight",
+	KeyDownLeft:       "DownLeft",
+	KeyDownRight:      "DownRight",
+	KeyCenter:         "Center",
+	KeyPgDn:           "PgDn",
+	KeyPgUp:           "PgUp",
+	KeyClear:          "Clear",
+	KeyExit:           "Exit",
+	KeyCancel:         "Cancel",
+	KeyPause:          "Pause",
+	KeyPrint:          "Print",
+	KeyF1:             "F1",
+	KeyF2:             "F2",
+	KeyF3:             "F3",
+	KeyF4:             "F4",
+	KeyF5:             "F5",
+	KeyF6:             "F6",
+	KeyF7:             "F7",
+	KeyF8:             "F8",
+	KeyF9:             "F9",
+	KeyF10:            "F10",
+	KeyF11:            "F11",
+	KeyF12:            "F12",
+	KeyF13:            "F13",
+	KeyF14:            "F14",
+	KeyF15:            "F15",
+	KeyF16:            "F16",
+	KeyF17:            "F17",
+	KeyF18:            "F18",
+	KeyF19:            "F19",
+	KeyF20:            "F20",
+	KeyF21:            "F21",
+	KeyF22:            "F22",
+	KeyF23:            "F23",
+	KeyF24:            "F24",
+	KeyF25:            "F25",
+	KeyF26:            "F26",
+	KeyF27:            "F27",
+	KeyF28:            "F28",
+	KeyF29:            "F29",
+	KeyF30:            "F30",
+	KeyF31:            "F31",
+	KeyF32:            "F32",
+	KeyF33:            "F33",
+	KeyF34:            "F34",
+	KeyF35:            "F35",
+	KeyF36:            "F36",
+	KeyF37:            "F37",
+	KeyF38:            "F38",
+	KeyF39:            "F39",
+	KeyF40:            "F40",
+	KeyF41:            "F41",
+	KeyF42:            "F42",
+	KeyF43:            "F43",
+	KeyF44:            "F44",
+	KeyF45:            "F45",
+	KeyF46:            "F46",
+	KeyF47:            "F47",
+	KeyF48:            "F48",
+	KeyF49:            "F49",
+	KeyF50:            "F50",
+	KeyF51:            "F51",
+	KeyF52:            "F52",
+	KeyF53:            "F53",
+	KeyF54:            "F54",
+	KeyF55:            "F55",
+	KeyF56:            "F56",
+	KeyF57:            "F57",
+	KeyF58:            "F58",
+	KeyF59:            "F59",
+	KeyF60:            "F60",
+	KeyF61:            "F61",
+	KeyF62:            "F62",
+	KeyF63:            "F63",
+	KeyF64:            "F64",
+	KeyCtrlA:          "Ctrl-A",
+	KeyCtrlB:          "Ctrl-B",
+	KeyCtrlC:          "Ctrl-C",
+	KeyCtrlD:          "Ctrl-D",
+	KeyCtrlE:          "Ctrl-E",
+	KeyCtrlF:          "Ctrl-F",
+	KeyCtrlG:          "Ctrl-G",
+	KeyCtrlJ:          "Ctrl-J",
+	KeyCtrlK:          "Ctrl-K",
+	KeyCtrlL:          "Ctrl-L",
+	KeyCtrlN:          "Ctrl-N",
+	KeyCtrlO:          "Ctrl-O",
+	KeyCtrlP:          "Ctrl-P",
+	KeyCtrlQ:          "Ctrl-Q",
+	KeyCtrlR:          "Ctrl-R",
+	KeyCtrlS:          "Ctrl-S",
+	KeyCtrlT:          "Ctrl-T",
+	KeyCtrlU:          "Ctrl-U",
+	KeyCtrlV:          "Ctrl-V",
+	KeyCtrlW:          "Ctrl-W",
+	KeyCtrlX:          "Ctrl-X",
+	KeyCtrlY:          "Ctrl-Y",
+	KeyCtrlZ:          "Ctrl-Z",
+	KeyCtrlSpace:      "Ctrl-Space",
+	KeyCtrlUnderscore: "Ctrl-_",
+	KeyCtrlRightSq:    "Ctrl-]",
+	KeyCtrlBackslash:  "Ctrl-\\",
+	KeyCtrlCarat:      "Ctrl-^",
+}
+
+// Name returns a printable value or the key stroke.  This can be used
+// when printing the event, for example.
+func (ev *EventKey) Name() string {
+	s := ""
+	m := []string{}
+	if ev.mod&ModShift != 0 {
+		m = append(m, "Shift")
+	}
+	if ev.mod&ModAlt != 0 {
+		m = append(m, "Alt")
+	}
+	if ev.mod&ModMeta != 0 {
+		m = append(m, "Meta")
+	}
+	if ev.mod&ModCtrl != 0 {
+		m = append(m, "Ctrl")
+	}
+
+	ok := false
+	if s, ok = KeyNames[ev.key]; !ok {
+		if ev.key == KeyRune {
+			s = "Rune[" + string(ev.ch) + "]"
+		} else {
+			s = fmt.Sprintf("Key[%d,%d]", ev.key, int(ev.ch))
+		}
+	}
+	if len(m) != 0 {
+		if ev.mod&ModCtrl != 0 && strings.HasPrefix(s, "Ctrl-") {
+			s = s[5:]
+		}
+		return fmt.Sprintf("%s+%s", strings.Join(m, "+"), s)
+	}
+	return s
+}
+
+// NewEventKey attempts to create a suitable event.  It parses the various
+// ASCII control sequences if KeyRune is passed for Key, but if the caller
+// has more precise information it should set that specifically.  Callers
+// that aren't sure about modifier state (most) should just pass ModNone.
+func NewEventKey(k Key, ch rune, mod ModMask) *EventKey {
+	if k == KeyRune && (ch < ' ' || ch == 0x7f) {
+		// Turn specials into proper key codes.  This is for
+		// control characters and the DEL.
+		k = Key(ch)
+		if mod == ModNone && ch < ' ' {
+			switch Key(ch) {
+			case KeyBackspace, KeyTab, KeyEsc, KeyEnter:
+				// these keys are directly typeable without CTRL
+			default:
+				// most likely entered with a CTRL keypress
+				mod = ModCtrl
+			}
+		}
+	}
+	return &EventKey{t: time.Now(), key: k, ch: ch, mod: mod}
+}
+
+// ModMask is a mask of modifier keys.  Note that it will not always be
+// possible to report modifier keys.
+type ModMask int16
+
+// These are the modifiers keys that can be sent either with a key press,
+// or a mouse event.  Note that as of now, due to the confusion associated
+// with Meta, and the lack of support for it on many/most platforms, the
+// current implementations never use it.  Instead, they use ModAlt, even for
+// events that could possibly have been distinguished from ModAlt.
+const (
+	ModShift ModMask = 1 << iota
+	ModCtrl
+	ModAlt
+	ModMeta
+	ModNone ModMask = 0
+)
+
+// Key is a generic value for representing keys, and especially special
+// keys (function keys, cursor movement keys, etc.)  For normal keys, like
+// ASCII letters, we use KeyRune, and then expect the application to
+// inspect the Rune() member of the EventKey.
+type Key int16
+
+// This is the list of named keys.  KeyRune is special however, in that it is
+// a place holder key indicating that a printable character was sent.  The
+// actual value of the rune will be transported in the Rune of the associated
+// EventKey.
+const (
+	KeyRune Key = iota + 256
+	KeyUp
+	KeyDown
+	KeyRight
+	KeyLeft
+	KeyUpLeft
+	KeyUpRight
+	KeyDownLeft
+	KeyDownRight
+	KeyCenter
+	KeyPgUp
+	KeyPgDn
+	KeyHome
+	KeyEnd
+	KeyInsert
+	KeyDelete
+	KeyHelp
+	KeyExit
+	KeyClear
+	KeyCancel
+	KeyPrint
+	KeyPause
+	KeyBacktab
+	KeyF1
+	KeyF2
+	KeyF3
+	KeyF4
+	KeyF5
+	KeyF6
+	KeyF7
+	KeyF8
+	KeyF9
+	KeyF10
+	KeyF11
+	KeyF12
+	KeyF13
+	KeyF14
+	KeyF15
+	KeyF16
+	KeyF17
+	KeyF18
+	KeyF19
+	KeyF20
+	KeyF21
+	KeyF22
+	KeyF23
+	KeyF24
+	KeyF25
+	KeyF26
+	KeyF27
+	KeyF28
+	KeyF29
+	KeyF30
+	KeyF31
+	KeyF32
+	KeyF33
+	KeyF34
+	KeyF35
+	KeyF36
+	KeyF37
+	KeyF38
+	KeyF39
+	KeyF40
+	KeyF41
+	KeyF42
+	KeyF43
+	KeyF44
+	KeyF45
+	KeyF46
+	KeyF47
+	KeyF48
+	KeyF49
+	KeyF50
+	KeyF51
+	KeyF52
+	KeyF53
+	KeyF54
+	KeyF55
+	KeyF56
+	KeyF57
+	KeyF58
+	KeyF59
+	KeyF60
+	KeyF61
+	KeyF62
+	KeyF63
+	KeyF64
+)
+
+// These are the control keys.  Note that they overlap with other keys,
+// perhaps.  For example, KeyCtrlH is the same as KeyBackspace.
+const (
+	KeyCtrlSpace Key = iota
+	KeyCtrlA
+	KeyCtrlB
+	KeyCtrlC
+	KeyCtrlD
+	KeyCtrlE
+	KeyCtrlF
+	KeyCtrlG
+	KeyCtrlH
+	KeyCtrlI
+	KeyCtrlJ
+	KeyCtrlK
+	KeyCtrlL
+	KeyCtrlM
+	KeyCtrlN
+	KeyCtrlO
+	KeyCtrlP
+	KeyCtrlQ
+	KeyCtrlR
+	KeyCtrlS
+	KeyCtrlT
+	KeyCtrlU
+	KeyCtrlV
+	KeyCtrlW
+	KeyCtrlX
+	KeyCtrlY
+	KeyCtrlZ
+	KeyCtrlLeftSq // Escape
+	KeyCtrlBackslash
+	KeyCtrlRightSq
+	KeyCtrlCarat
+	KeyCtrlUnderscore
+)
+
+// Special values - these are fixed in an attempt to make it more likely
+// that aliases will encode the same way.
+
+// These are the defined ASCII values for key codes.  They generally match
+// with KeyCtrl values.
+const (
+	KeyNUL Key = iota
+	KeySOH
+	KeySTX
+	KeyETX
+	KeyEOT
+	KeyENQ
+	KeyACK
+	KeyBEL
+	KeyBS
+	KeyTAB
+	KeyLF
+	KeyVT
+	KeyFF
+	KeyCR
+	KeySO
+	KeySI
+	KeyDLE
+	KeyDC1
+	KeyDC2
+	KeyDC3
+	KeyDC4
+	KeyNAK
+	KeySYN
+	KeyETB
+	KeyCAN
+	KeyEM
+	KeySUB
+	KeyESC
+	KeyFS
+	KeyGS
+	KeyRS
+	KeyUS
+	KeyDEL Key = 0x7F
+)
+
+// These keys are aliases for other names.
+const (
+	KeyBackspace  = KeyBS
+	KeyTab        = KeyTAB
+	KeyEsc        = KeyESC
+	KeyEscape     = KeyESC
+	KeyEnter      = KeyCR
+	KeyBackspace2 = KeyDEL
+)

vendor/github.com/gdamore/tcell/mouse.go

@@ -0,0 +1,97 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"time"
+)
+
+// EventMouse is a mouse event.  It is sent on either mouse up or mouse down
+// events.  It is also sent on mouse motion events - if the terminal supports
+// it.  We make every effort to ensure that mouse release events are delivered.
+// Hence, click drag can be identified by a motion event with the mouse down,
+// without any intervening button release.  On some terminals only the initiating
+// press and terminating release event will be delivered.
+//
+// Mouse wheel events, when reported, may appear on their own as individual
+// impulses; that is, there will normally not be a release event delivered
+// for mouse wheel movements.
+//
+// Most terminals cannot report the state of more than one button at a time --
+// and some cannot report motion events unless a button is pressed.
+//
+// Applications can inspect the time between events to resolve double or
+// triple clicks.
+type EventMouse struct {
+	t   time.Time
+	btn ButtonMask
+	mod ModMask
+	x   int
+	y   int
+}
+
+// When returns the time when this EventMouse was created.
+func (ev *EventMouse) When() time.Time {
+	return ev.t
+}
+
+// Buttons returns the list of buttons that were pressed or wheel motions.
+func (ev *EventMouse) Buttons() ButtonMask {
+	return ev.btn
+}
+
+// Modifiers returns a list of keyboard modifiers that were pressed
+// with the mouse button(s).
+func (ev *EventMouse) Modifiers() ModMask {
+	return ev.mod
+}
+
+// Position returns the mouse position in character cells.  The origin
+// 0, 0 is at the upper left corner.
+func (ev *EventMouse) Position() (int, int) {
+	return ev.x, ev.y
+}
+
+// NewEventMouse is used to create a new mouse event.  Applications
+// shouldn't need to use this; its mostly for screen implementors.
+func NewEventMouse(x, y int, btn ButtonMask, mod ModMask) *EventMouse {
+	return &EventMouse{t: time.Now(), x: x, y: y, btn: btn, mod: mod}
+}
+
+// ButtonMask is a mask of mouse buttons and wheel events.  Mouse button presses
+// are normally delivered as both press and release events.  Mouse wheel events
+// are normally just single impulse events.  Windows supports up to eight
+// separate buttons plus all four wheel directions, but XTerm can only support
+// mouse buttons 1-3 and wheel up/down.  Its not unheard of for terminals
+// to support only one or two buttons (think Macs).  Old terminals, and true
+// emulations (such as vt100) won't support mice at all, of course.
+type ButtonMask int16
+
+// These are the actual button values.
+const (
+	Button1 ButtonMask = 1 << iota // Usually left mouse button.
+	Button2                        // Usually the middle mouse button.
+	Button3                        // Usually the right mouse button.
+	Button4                        // Often a side button (thumb/next).
+	Button5                        // Often a side button (thumb/prev).
+	Button6
+	Button7
+	Button8
+	WheelUp                   // Wheel motion up/away from user.
+	WheelDown                 // Wheel motion down/towards user.
+	WheelLeft                 // Wheel motion to left.
+	WheelRight                // Wheel motion to right.
+	ButtonNone ButtonMask = 0 // No button or wheel events.
+)

vendor/github.com/gdamore/tcell/resize.go

@@ -0,0 +1,42 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"time"
+)
+
+// EventResize is sent when the window size changes.
+type EventResize struct {
+	t time.Time
+	w int
+	h int
+}
+
+// NewEventResize creates an EventResize with the new updated window size,
+// which is given in character cells.
+func NewEventResize(width, height int) *EventResize {
+	return &EventResize{t: time.Now(), w: width, h: height}
+}
+
+// When returns the time when the Event was created.
+func (ev *EventResize) When() time.Time {
+	return ev.t
+}
+
+// Size returns the new window size as width, height in character cells.
+func (ev *EventResize) Size() (int, int) {
+	return ev.w, ev.h
+}