background fill (introduces race condition!)

slideshow.go

@@ -9,19 +9,33 @@ import (
 
 func slideshow(ch <-chan string) {
 	dir := <-ch
-	ticker := time.NewTicker(time.Duration(config.Duration) * time.Second)
+	ticker := time.NewTicker(time.Duration(config.Duration) * time.Minute)
+
 	//set a flat background color based on config defaults
-	// err = exec.Command("swaybg", "-i", img, "--mode", "fit").Run()
+	fillReady := make(chan bool)
+	go func() {
+		fillCmd := exec.Command("swaybg", "-c", "#232136")
+		err := fillCmd.Start()
+		if err != nil {
+			fmt.Println("could not set background color", err)
+		}
+		fmt.Println("bg color set!")
+		fillReady <- true
+		fillCmd.Wait()
+	}()
+
 	var cmd *exec.Cmd
 	go func() {
 		for {
+			<-fillReady
+			newCmd := setRandomWallpaper(dir)
 			if cmd != nil {
 				err := cmd.Process.Kill()
 				if err != nil {
 					log.Fatal("could not kill process", err)
 				}
 			}
-			cmd = setRandomWallpaper(dir)
+			cmd = newCmd
 			select {
 			case dir = <-ch:
 				log.Println("directory set!")
@@ -38,9 +52,9 @@ func setRandomWallpaper(dir string) *exec.Cmd {
 	if err != nil {
 		panic(err)
 	}
-	fmt.Printf("setting wallpaper: %v\n", img)
 
 	cmd := exec.Command("swaybg", "-i", img, "--mode", "fit")
+	fmt.Printf("setting wallpaper: %v\n", img)
 	err = cmd.Start()
 	if err != nil {
 		log.Fatal("failed to set wallpaper!", err)