Finish porting clipboard kitten to Go

tools/tui/loop/api.go

@@ -20,6 +20,16 @@ type ScreenSize struct {
 
 type IdType uint64
 type TimerCallback func(timer_id IdType) error
+type EscapeCodeType int
+
+const (
+	CSI EscapeCodeType = iota
+	DCS
+	OSC
+	APC
+	SOS
+	PM
+)
 
 type timer struct {
 	interval time.Duration
@@ -47,6 +57,8 @@ type Loop struct {
 	pending_writes                         []*write_msg
 	on_SIGTSTP                             func() error
 
+	// Send strings to this channel to queue writes in a thread safe way
+
 	// Callbacks
 
 	// Called when the terminal has been fully setup. Any string returned is sent to
@@ -76,6 +88,9 @@ type Loop struct {
 	// Called when any input from tty is received
 	OnReceivedData func(data []byte) error
 
+	// Called when an escape code is received that is not handled by any other handler
+	OnEscapeCode func(EscapeCodeType, []byte) error
+
 	// Called when resuming from a SIGTSTP or Ctrl-z
 	OnResumeFromStop func() error