91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
package main
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import (
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"io"
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"log"
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"os"
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"os/exec"
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"os/signal"
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"syscall"
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"time"
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"github.com/gdamore/tcell"
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"github.com/rivo/tview"
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)
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const (
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CMD_FIM = "/usr/local/bin/pf-fim.sh"
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SLIDESHOW_INTERVAL = 300 * time.Second
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)
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func main() {
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// fim placeholder so we can operate on it when a signal is received
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var fim *exec.Cmd = nil
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// Setup signal listening
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sigs := make(chan os.Signal)
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signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
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defer func() { close(sigs) }()
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// Goroutine to handle os signals (nuke fim so we can get to config ui)
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go func() {
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for range sigs {
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if fim != nil { // Just in case someone lays on ctrl-c or similar during startup
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if err := fim.Process.Kill(); err != nil {
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log.Fatalf("failed to kill fim : %s", err)
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}
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}
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}
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}()
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// Run slideshow
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fim = exec.Command(CMD_FIM)
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// Setup stdin for fim to control slideshow
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stdin, err := fim.StdinPipe()
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if err != nil {
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log.Fatalf("Error getting fim stdin : %s", err)
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}
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// Advance slideshow every interval as defined in const()
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ticker := time.NewTicker(SLIDESHOW_INTERVAL)
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stop_ticker := make(chan struct{})
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go func() {
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for {
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select {
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case <-ticker.C:
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_, err = io.WriteString(stdin, "n")
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if err != nil {
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log.Fatalf("Error advancing slides : %s", err)
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}
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case <-stop_ticker:
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ticker.Stop()
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stdin.Close()
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return
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}
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}
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}()
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// Run fim
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if err := fim.Run(); err != nil {
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// Unwrap the error a bit so we can find out if a signal killed fim or something else
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// An exit code of -1 means the program didn't exit in time or was terminated by a signal (per the docs)
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if exitError, ok := err.(*exec.ExitError); ok && exitError.ExitCode() != -1 {
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log.Fatalf("Error running fim : %s", err)
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}
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}
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// Stop fim slideshow advancing go routine
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close(stop_ticker)
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// Run config UI when slideshow stops
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app := tview.NewApplication()
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frame := tview.NewFrame(tview.NewBox().SetBackgroundColor(tcell.ColorBlack)).
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SetBorders(2, 2, 2, 2, 4, 4).
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AddText("PiFrame", true, tview.AlignCenter, tcell.ColorWhite).
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AddText("Configuration Utility", true, tview.AlignCenter, tcell.ColorRed)
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if err := app.SetRoot(frame, true).EnableMouse(true).Run(); err != nil {
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log.Fatalf("Error running UI : %s", err)
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}
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}
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