Improve clipboard handling on macOS

v2/internal/frontend/desktop/darwin/clipboard.go

@@ -3,34 +3,55 @@
 package darwin
 
 import (
-	"os/exec"
+	"fmt"
 )
 
+/*
+#cgo CFLAGS: -mmacosx-version-min=10.13 -x objective-c
+#cgo LDFLAGS: -framework Cocoa -mmacosx-version-min=10.13
+
+#import <Cocoa/Cocoa.h>
+#import <stdlib.h>
+
+bool setClipboardText(const char* text) {
+	NSPasteboard *pasteBoard = [NSPasteboard generalPasteboard];
+	NSError *error = nil;
+	NSString *string = [NSString stringWithUTF8String:text];
+	[pasteBoard clearContents];
+	return [pasteBoard setString:string forType:NSPasteboardTypeString];
+}
+
+const char* getClipboardText() {
+	NSPasteboard *pasteboard = [NSPasteboard generalPasteboard];
+	NSString *text = [pasteboard stringForType:NSPasteboardTypeString];
+	return [text UTF8String];
+}
+
+*/
+import "C"
+import (
+	"sync"
+	"unsafe"
+)
+
+var clipboardLock sync.RWMutex
+
 func (f *Frontend) ClipboardGetText() (string, error) {
-	pasteCmd := exec.Command("pbpaste")
-	out, err := pasteCmd.Output()
-	if err != nil {
-		return "", err
-	}
-	return string(out), nil
+	clipboardLock.RLock()
+	defer clipboardLock.RUnlock()
+	clipboardText := C.getClipboardText()
+	result := C.GoString(clipboardText)
+	return result, nil
 }
 
 func (f *Frontend) ClipboardSetText(text string) error {
-
-	copyCmd := exec.Command("pbcopy")
-	in, err := copyCmd.StdinPipe()
-	if err != nil {
-		return err
+	clipboardLock.Lock()
+	defer clipboardLock.Unlock()
+	cText := C.CString(text)
+	success := C.setClipboardText(cText)
+	C.free(unsafe.Pointer(cText))
+	if !success {
+		return fmt.Errorf("unable to set clipboard text")
 	}
-
-	if err := copyCmd.Start(); err != nil {
-		return err
-	}
-	if _, err := in.Write([]byte(text)); err != nil {
-		return err
-	}
-	if err := in.Close(); err != nil {
-		return err
-	}
-	return copyCmd.Wait()
+	return nil
 }