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