piframe-go/cmd/ui/ui.go

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package main
import (
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"fmt"
"log"
"os"
"os/exec"
"os/signal"
"syscall"
"github.com/gdamore/tcell"
"github.com/rivo/tview"
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)
func main() {
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// fim placeholder so we can operate on it when a signal is received
var fim *exec.Cmd = nil
// Setup signal listening
sigs := make(chan os.Signal)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
defer func() { close(sigs) }()
// Goroutine to handle os signals (nuke fim so we can get to config ui)
go func() {
for sig := range sigs {
fmt.Println(sig)
if fim != nil { // Just in case someone lays on ctrl-c or similar during startup
if err := fim.Process.Kill(); err != nil {
log.Fatal("failed to kill process: ", err)
}
}
}
}()
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// Forever run slideshow / show ui as the main program executed on a PiFrame
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for {
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// Run slideshow
fim = exec.Command("/usr/local/bin/fim-slideshow.sh")
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 {
log.Fatalf("Error : ", err)
}
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}
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// Run config UI when slideshow stops
app := tview.NewApplication()
frame := tview.NewFrame(tview.NewBox().SetBackgroundColor(tcell.ColorBlack)).
SetBorders(2, 2, 2, 2, 4, 4).
AddText("PiFrame", true, tview.AlignCenter, tcell.ColorWhite).
AddText("Configuration Utility", true, tview.AlignCenter, tcell.ColorRed)
if err := app.SetRoot(frame, true).EnableMouse(true).Run(); err != nil {
log.Fatal(err)
}
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}
}