GUI fields now trim leading and trailing whitespace:

internal/sdl/sdl.go

@@ -63,8 +63,11 @@ var (
 	sdlGetAudioPlaybackDevices func(count *int32) uintptr
 	sdlGetAudioDeviceName      func(devid uint32) uintptr
 
-	sdlStartTextInput func(window uintptr)
-	sdlStopTextInput  func(window uintptr)
+	sdlStartTextInput   func(window uintptr)
+	sdlStopTextInput    func(window uintptr)
+	sdlGetClipboardText func() uintptr
+	sdlSetClipboardText func(text *byte) bool
+	sdlFree             func(memory uintptr)
 )
 
 var loaded = false
@@ -98,6 +101,9 @@ func Load() error {
 	// input
 	purego.RegisterLibFunc(&sdlStartTextInput, h, "SDL_StartTextInput")
 	purego.RegisterLibFunc(&sdlStopTextInput, h, "SDL_StopTextInput")
+	purego.RegisterLibFunc(&sdlGetClipboardText, h, "SDL_GetClipboardText")
+	purego.RegisterLibFunc(&sdlSetClipboardText, h, "SDL_SetClipboardText")
+	purego.RegisterLibFunc(&sdlFree, h, "SDL_free")
 	loaded = true
 	return nil
 }
@@ -197,3 +203,21 @@ func GetAudioPlaybackDevices() []AudioDevice {
 // Input wrappers
 func StartTextInput(window uintptr) { sdlStartTextInput(window) }
 func StopTextInput(window uintptr)  { sdlStopTextInput(window) }
+
+func GetClipboardText() string {
+	text := sdlGetClipboardText()
+	if text == 0 {
+		return ""
+	}
+	result := cstr(text)
+	sdlFree(text)
+	return result
+}
+
+func SetClipboardText(text string) bool {
+	bytes := make([]byte, len(text)+1)
+	copy(bytes, text)
+	result := sdlSetClipboardText(&bytes[0])
+	runtime.KeepAlive(bytes)
+	return result
+}