just moving functions around

main.go

@@ -19,9 +19,8 @@ import (
 	"github.com/fogleman/gg"
 )
 
-/*  contents of struct mostly don't matter for toolkit.
+//  contents of struct mostly don't matter for toolkit.
 
- */
 type Animation struct {
 	ctx      *gg.Context
 	position image.Point
@@ -35,6 +34,7 @@ type Animation struct {
 	msg      string
 }
 
+//flags from cmd line
 var (
 	rows                     = flag.Int("led-rows", 32, "number of rows supported")
 	cols                     = flag.Int("led-cols", 32, "number of columns supported")
@@ -47,43 +47,7 @@ var (
 	disable_hardware_pulsing = flag.Bool("led-no-hardware-pulse", false, "Don't use hardware pin-pulse generation.")
 )
 
-func main() {
+//listens on topic for messages
-	config := &rgbmatrix.DefaultConfig
-	config.Rows = *rows
-	config.Cols = *cols
-	config.Parallel = *parallel
-	config.ChainLength = *chain
-	config.Brightness = *brightness
-	config.HardwareMapping = *hardware_mapping
-	config.ShowRefreshRate = *show_refresh
-	config.InverseColors = *inverse_colors
-	config.DisableHardwarePulsing = *disable_hardware_pulsing
-	setupMQTT()
-
-	m, err := rgbmatrix.NewRGBLedMatrix(config)
-	fatal(err)
-	mqMessages := make(chan mqtt.Message)
-	log.Println("making listener")
-	go listener(mqMessages)
-	tk := rgbmatrix.NewToolKit(m)
-	defer tk.Close()
-	log.Println("making animator")
-	go animator(tk, mqMessages)
-	log.Println("I guess I'm at the end")
-	sigs := make(chan os.Signal, 1)
-	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
-	done := make(chan bool, 1)
-	go func() {
-		sig := <-sigs
-		fmt.Println()
-		fmt.Println(sig)
-		done <- true
-	}()
-	fmt.Println("awaiting signal")
-	<-done
-	fmt.Println("exiting")
-}
-
 func listener(mqMessages chan mqtt.Message) {
 	opts := setupMQTT()
 	client := MQTT.NewClient(opts)
@@ -105,9 +69,13 @@ func animator(tk *rgbmatrix.ToolKit, mqMessages chan mqtt.Message) {
 	tk.PlayAnimation(NewAnimation(image.Point{64, 32}, mqMessages))
 
 }
+
+//connection lost management
 func onConnectionLostHandler(c MQTT.Client, reason error) {
 	log.Fatalf(reason.Error())
 }
+
+//setup connection to mqtt, topic to listen to, qos
 func setupMQTT() *mqtt.ClientOptions {
 	opts := MQTT.NewClientOptions()
 	opts.AddBroker(fmt.Sprintf("tcp://%s:%s", os.Getenv("MQTTBROKER"), os.Getenv("MQTTPORT")))
@@ -119,10 +87,13 @@ func setupMQTT() *mqtt.ClientOptions {
 
 	return opts
 }
+
+//runs before main, parses flags
 func init() {
 	flag.Parse()
 }
 
+//small function for handling fatal errors
 func fatal(err error) {
 	if err != nil {
 		panic(err)
@@ -180,6 +151,7 @@ func (a *Animation) Next() (image.Image, <-chan time.Time, error) {
 	return a.ctx.Image(), time.After(time.Millisecond * 50), nil
 }
 
+//what mario does every frame
 func (a *Animation) updatePosition() {
 	a.position.X += 1 * a.dir.X
 	a.position.Y += 1 * a.dir.Y
@@ -198,3 +170,40 @@ func (a *Animation) updatePosition() {
 		a.dir.X = 1
 	}
 }
+
+func main() {
+	config := &rgbmatrix.DefaultConfig
+	config.Rows = *rows
+	config.Cols = *cols
+	config.Parallel = *parallel
+	config.ChainLength = *chain
+	config.Brightness = *brightness
+	config.HardwareMapping = *hardware_mapping
+	config.ShowRefreshRate = *show_refresh
+	config.InverseColors = *inverse_colors
+	config.DisableHardwarePulsing = *disable_hardware_pulsing
+	setupMQTT()
+
+	m, err := rgbmatrix.NewRGBLedMatrix(config)
+	fatal(err)
+	mqMessages := make(chan mqtt.Message)
+	log.Println("making listener")
+	go listener(mqMessages)
+	tk := rgbmatrix.NewToolKit(m)
+	defer tk.Close()
+	log.Println("making animator")
+	go animator(tk, mqMessages)
+	log.Println("I guess I'm at the end")
+	sigs := make(chan os.Signal, -1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+	done := make(chan bool, -1)
+	go func() {
+		sig := <-sigs
+		fmt.Println()
+		fmt.Println(sig)
+		done <- true
+	}()
+	fmt.Println("awaiting signal")
+	<-done
+	fmt.Println("exiting")
+}