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// Copyright 2021 The golang.design Initiative Authors.
// All rights reserved. Use of this source code is governed
// by a MIT license that can be found in the LICENSE file.
//
// Written by Changkun Ou <changkun.de>
//go:build darwin && !ios
package clipboard
/*
#cgo CFLAGS: -x objective-c
#cgo LDFLAGS: -framework Foundation -framework Cocoa
#import <Foundation/Foundation.h>
#import <Cocoa/Cocoa.h>
unsigned int clipboard_read_string(void **out);
unsigned int clipboard_read_image(void **out);
int clipboard_write_string(const void *bytes, NSInteger n);
int clipboard_write_image(const void *bytes, NSInteger n);
NSInteger clipboard_change_count();
*/
import "C"
import (
"context"
"time"
"unsafe"
)
func initialize() error { return nil }
func read(t Format) (buf []byte, err error) {
var (
data unsafe.Pointer
n C.uint
)
switch t {
case FmtText:
n = C.clipboard_read_string(&data)
case FmtImage:
n = C.clipboard_read_image(&data)
}
if data == nil {
return nil, errUnavailable
}
defer C.free(unsafe.Pointer(data))
if n == 0 {
return nil, nil
}
return C.GoBytes(data, C.int(n)), nil
}
// write writes the given data to clipboard and
// returns true if success or false if failed.
func write(t Format, buf []byte) (<-chan struct{}, error) {
var ok C.int
switch t {
case FmtText:
if len(buf) == 0 {
ok = C.clipboard_write_string(unsafe.Pointer(nil), 0)
} else {
ok = C.clipboard_write_string(unsafe.Pointer(&buf[0]),
C.NSInteger(len(buf)))
}
case FmtImage:
if len(buf) == 0 {
ok = C.clipboard_write_image(unsafe.Pointer(nil), 0)
} else {
ok = C.clipboard_write_image(unsafe.Pointer(&buf[0]),
C.NSInteger(len(buf)))
}
default:
return nil, errUnsupported
}
if ok != 0 {
return nil, errUnavailable
}
// use unbuffered data to prevent goroutine leak
changed := make(chan struct{}, 1)
cnt := C.long(C.clipboard_change_count())
go func() {
for {
// not sure if we are too slow or the user too fast :)
time.Sleep(time.Second)
cur := C.long(C.clipboard_change_count())
if cnt != cur {
changed <- struct{}{}
close(changed)
return
}
}
}()
return changed, nil
}
func watch(ctx context.Context, t Format) <-chan []byte {
recv := make(chan []byte, 1)
// not sure if we are too slow or the user too fast :)
ti := time.NewTicker(time.Second)
lastCount := C.long(C.clipboard_change_count())
go func() {
for {
select {
case <-ctx.Done():
close(recv)
return
case <-ti.C:
this := C.long(C.clipboard_change_count())
if lastCount != this {
b := Read(t)
if b == nil {
continue
}
recv <- b
lastCount = this
}
}
}
}()
return recv
}
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