cycle through presets with right

cmd/root.go

@@ -25,6 +25,7 @@ import (
 )
 
 var preset string
+var scriptPath string
 
 func handleWindowEvent(event *sdl.WindowEvent, m *milkDropWindow) {
 	switch event.Event {
@@ -34,6 +35,13 @@ func handleWindowEvent(event *sdl.WindowEvent, m *milkDropWindow) {
 	}
 }
 
+func handleKeyboardEvent(event *sdl.KeyboardEvent, m *milkDropWindow) {
+	scancode := event.Keysym.Scancode
+	if event.Type == sdl.KEYDOWN && scancode == sdl.SCANCODE_RIGHT {
+		m.nextPreset()
+	}
+}
+
 func handleEvent(event sdl.Event, m *milkDropWindow) bool {
 	switch event.(type) {
 	case *sdl.QuitEvent:
@@ -41,6 +49,9 @@ func handleEvent(event sdl.Event, m *milkDropWindow) bool {
 	case *sdl.WindowEvent:
 		event := event.(*sdl.WindowEvent)
 		handleWindowEvent(event, m)
+	case *sdl.KeyboardEvent:
+		event := event.(*sdl.KeyboardEvent)
+		handleKeyboardEvent(event, m)
 	}
 
 	return true
@@ -60,7 +71,7 @@ func milkbucket(cmd *cobra.Command, args []string) {
 	}
 	defer sdl.Quit()
 
-	m, err := newMilkDropWindow(800, 600)
+	m, err := newMilkDropWindow(800, 600, scriptPath)
 	if err != nil {
 		panic(err)
 	}
@@ -115,4 +126,5 @@ func init() {
 	// Cobra also supports local flags, which will only run
 	// when this action is called directly.
 	rootCmd.Flags().StringVarP(&preset, "preset", "p", "", "Preset file to use")
+	rootCmd.Flags().StringVarP(&scriptPath, "script", "s", "", "Script file to use")
 }

cmd/window.go

@@ -24,7 +24,9 @@ package cmd
 import "C"
 
 import (
+	"container/ring"
 	"encoding/binary"
+	"encoding/json"
 	"errors"
 	"io"
 	"os"
@@ -39,12 +41,55 @@ type milkDropWindow struct {
 	window  *sdl.Window
 	context sdl.GLContext
 	handle  C.projectm_handle
+	preset  *ring.Ring
 }
 
-func newMilkDropWindow(width, height int32) (*milkDropWindow, error) {
+type script struct {
+	Presets []string
+	Times   []float64
+}
+
+func readScript(scriptPath string) (*script, error) {
+	if scriptPath == "" {
+		return nil, errors.New("no script given")
+	}
+
+	f, err := os.Open(scriptPath)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	data, err := io.ReadAll(f)
+	if err != nil {
+		return nil, err
+	}
+
+	var s script
+	err = json.Unmarshal(data, &s)
+	return &s, err
+}
+
+func (m *milkDropWindow) nextPreset() {
+	m.preset = m.preset.Next()
+	m.loadPreset(m.preset.Value.(string))
+}
+
+func newMilkDropWindow(width, height int32, scriptPath string) (*milkDropWindow, error) {
 	var m milkDropWindow
 	var err error
 
+	s, err := readScript(scriptPath)
+	if err != nil {
+		return nil, err
+	}
+
+	m.preset = ring.New(len(s.Presets))
+	for _, preset := range s.Presets {
+		m.preset.Value = preset
+		m.preset = m.preset.Next()
+	}
+
 	m.window, err = sdl.CreateWindow("milkbucket", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, width, height, sdl.WINDOW_OPENGL|sdl.WINDOW_RESIZABLE)
 	if err != nil {
 		return &m, err
@@ -74,7 +119,7 @@ func (m *milkDropWindow) destroy() {
 func (m *milkDropWindow) loadPreset(preset string) {
 	cPreset := C.CString(preset)
 	defer C.free(unsafe.Pointer(cPreset))
-	C.projectm_load_preset_file(m.handle, cPreset, false)
+	C.projectm_load_preset_file(m.handle, cPreset, true)
 }
 
 func (m *milkDropWindow) render() (bool, error) {