Add better keyboard handling to UI for fim controls and getting to the UI

cmd/ui/ui.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"io"
 	"log"
 	"os/exec"
@@ -22,34 +21,6 @@ func main() {
 	// fim placeholder so we can operate on it when a exit slideshow is received
 	var fim *exec.Cmd = nil
 
-	// Start watching for key strokes and echo them back to stdout
-	keysEvents, err := keyboard.GetKeys(10)
-	if err != nil {
-		panic(err)
-	}
-	defer func() {
-		_ = keyboard.Close()
-	}()
-
-	fmt.Println("Press ESC to kill slideshow")
-	go func() {
-		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 {
-				if fim != nil { // Just in case someone lays on exit key or similar during startup
-					if err := fim.Process.Kill(); err != nil {
-						log.Fatalf("failed to kill fim : %s", err)
-					}
-				}
-				break
-			}
-		}
-	}()
-
 	// Run slideshow
 	fim = exec.Command(CMD_FIM)
 
@@ -78,6 +49,55 @@ func main() {
 		}
 	}()
 
+	// Start watching for key strokes and echo them back to stdout
+	keysEvents, err := keyboard.GetKeys(10)
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		_ = keyboard.Close()
+	}()
+
+	// Goroutine for tracking which keys are pressed and controlling fim if appropriate
+	go func() {
+		for {
+			event := <-keysEvents
+			if event.Err != nil {
+				panic(event.Err)
+			}
+			log.Printf("You pressed: key %X\n", event.Key)
+
+			// 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 {
+				if fim != nil { // Just in case someone lays on exit key or similar during startup
+					if err := fim.Process.Kill(); 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 != "" {
+				log.Printf("Sending key to fim : %s", fimKey)
+				_, err = io.WriteString(stdin, fimKey)
+				if err != nil {
+					log.Fatalf("Error controlling fim : %s", err)
+				}
+				ticker.Reset(SLIDESHOW_INTERVAL)
+			}
+		}
+	}()
+
 	// Run fim
 	if err := fim.Run(); err != nil {
 		// Unwrap the error a bit so we can find out if a signal killed fim or something else