//go:build darwin
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package input
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/*
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#cgo CFLAGS: -x objective-c
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#cgo LDFLAGS: -framework AppKit -framework CoreGraphics -framework Carbon -framework ApplicationServices
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#include <AppKit/AppKit.h>
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#include <CoreGraphics/CoreGraphics.h>
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#include <Carbon/Carbon.h>
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#include <ApplicationServices/ApplicationServices.h>
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#include <stdlib.h>
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#include <string.h>
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static int ensureInputPermission(void) {
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NSDictionary* opts = @{(__bridge NSString*)kAXTrustedCheckOptionPrompt: @YES};
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return AXIsProcessTrustedWithOptions((__bridge CFDictionaryRef)opts) ? 1 : 0;
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}
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static void setClipboardText(const char* text) {
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NSPasteboard* pb = [NSPasteboard generalPasteboard];
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[pb clearContents];
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NSString* str = [NSString stringWithUTF8String:text];
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[pb setString:str forType:NSPasteboardTypeString];
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}
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static void clearClipboardText(void) {
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NSPasteboard* pb = [NSPasteboard generalPasteboard];
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[pb clearContents];
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}
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static char* getClipboardText(void) {
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NSPasteboard* pb = [NSPasteboard generalPasteboard];
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NSString* str = [pb stringForType:NSPasteboardTypeString];
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if (!str) return NULL;
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const char* utf8 = [str UTF8String];
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if (!utf8) return NULL;
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return strdup(utf8);
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}
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static void simulateCmdV() {
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CGEventSourceRef source = CGEventSourceCreate(kCGEventSourceStateCombinedSessionState);
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CGEventRef cmdDown = CGEventCreateKeyboardEvent(source, (CGKeyCode)kVK_Command, true);
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CGEventSetFlags(cmdDown, kCGEventFlagMaskCommand);
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CGEventPost(kCGHIDEventTap, cmdDown);
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CGEventRef vDown = CGEventCreateKeyboardEvent(source, (CGKeyCode)kVK_ANSI_V, true);
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CGEventSetFlags(vDown, kCGEventFlagMaskCommand);
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CGEventPost(kCGHIDEventTap, vDown);
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CGEventRef vUp = CGEventCreateKeyboardEvent(source, (CGKeyCode)kVK_ANSI_V, false);
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CGEventSetFlags(vUp, kCGEventFlagMaskCommand);
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CGEventPost(kCGHIDEventTap, vUp);
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CGEventRef cmdUp = CGEventCreateKeyboardEvent(source, (CGKeyCode)kVK_Command, false);
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CGEventSetFlags(cmdUp, 0);
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CGEventPost(kCGHIDEventTap, cmdUp);
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CFRelease(cmdDown);
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CFRelease(vDown);
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CFRelease(vUp);
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CFRelease(cmdUp);
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CFRelease(source);
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}
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static void typeUnicodeChar(unsigned int codepoint) {
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CGEventSourceRef source = CGEventSourceCreate(kCGEventSourceStateCombinedSessionState);
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UniChar chars[2];
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int len = 0;
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if (codepoint <= 0xFFFF) {
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chars[0] = (UniChar)codepoint;
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len = 1;
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} else {
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codepoint -= 0x10000;
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chars[0] = (UniChar)(0xD800 + (codepoint >> 10));
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chars[1] = (UniChar)(0xDC00 + (codepoint & 0x3FF));
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len = 2;
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}
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CGEventRef keyDown = CGEventCreateKeyboardEvent(source, 0, true);
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CGEventKeyboardSetUnicodeString(keyDown, len, chars);
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CGEventPost(kCGHIDEventTap, keyDown);
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CGEventRef keyUp = CGEventCreateKeyboardEvent(source, 0, false);
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CGEventKeyboardSetUnicodeString(keyUp, len, chars);
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CGEventPost(kCGHIDEventTap, keyUp);
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CFRelease(keyDown);
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CFRelease(keyUp);
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CFRelease(source);
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}
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*/
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import "C"
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import (
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"fmt"
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"sync"
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"time"
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"unsafe"
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)
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const (
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darwinClipboardVerifyTimeout = 500 * time.Millisecond
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darwinClipboardPollInterval = 15 * time.Millisecond
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darwinClipboardRestoreDelay = 900 * time.Millisecond
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)
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type darwinPaster struct{}
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type darwinClipboardSnapshot struct {
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text string
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hasText bool
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}
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type darwinPasteState struct {
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mu sync.Mutex
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generation uint64
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pendingRestore bool
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pendingText string
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restoreTo darwinClipboardSnapshot
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}
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var globalDarwinPasteState darwinPasteState
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func newPlatformPaster() Paster {
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return &darwinPaster{}
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}
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func (p *darwinPaster) Paste(text string, keepClipboard bool) error {
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if C.ensureInputPermission() == 0 {
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return fmt.Errorf("accessibility permission is required to paste")
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}
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state := &globalDarwinPasteState
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state.mu.Lock()
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state.generation++
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generation := state.generation
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originalClipboard := currentDarwinClipboardSnapshot()
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if !keepClipboard {
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originalClipboard = resolveDarwinRestoreTarget(
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originalClipboard,
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state.pendingRestore,
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state.pendingText,
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state.restoreTo,
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)
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}
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cstr := C.CString(text)
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defer C.free(unsafe.Pointer(cstr))
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C.setClipboardText(cstr)
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if !waitForDarwinClipboardText(text, darwinClipboardVerifyTimeout) {
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state.pendingRestore = false
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state.mu.Unlock()
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return fmt.Errorf("clipboard verification failed before paste")
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}
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C.simulateCmdV()
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if keepClipboard {
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state.pendingRestore = false
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state.mu.Unlock()
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return nil
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}
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state.pendingRestore = true
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state.pendingText = text
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state.restoreTo = originalClipboard
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state.mu.Unlock()
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go restoreDarwinClipboardAfterPaste(generation, text, originalClipboard)
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return nil
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}
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func (p *darwinPaster) TypeText(text string) error {
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if C.ensureInputPermission() == 0 {
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return fmt.Errorf("accessibility permission is required to type")
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}
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for _, r := range text {
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C.typeUnicodeChar(C.uint(r))
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}
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return nil
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}
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func currentDarwinClipboardSnapshot() darwinClipboardSnapshot {
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cText := C.getClipboardText()
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if cText == nil {
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return darwinClipboardSnapshot{}
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}
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defer C.free(unsafe.Pointer(cText))
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return darwinClipboardSnapshot{
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text: C.GoString(cText),
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hasText: true,
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}
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}
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func resolveDarwinRestoreTarget(current darwinClipboardSnapshot, pending bool, pendingText string, restoreTo darwinClipboardSnapshot) darwinClipboardSnapshot {
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if pending && current.hasText && current.text == pendingText {
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return restoreTo
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}
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return current
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}
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func waitForDarwinClipboardText(expected string, timeout time.Duration) bool {
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deadline := time.Now().Add(timeout)
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for {
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current := currentDarwinClipboardSnapshot()
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if current.hasText && current.text == expected {
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return true
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}
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if time.Now().After(deadline) {
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return false
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}
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time.Sleep(darwinClipboardPollInterval)
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}
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}
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func restoreDarwinClipboardAfterPaste(generation uint64, pastedText string, restoreTo darwinClipboardSnapshot) {
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time.Sleep(darwinClipboardRestoreDelay)
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state := &globalDarwinPasteState
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state.mu.Lock()
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defer state.mu.Unlock()
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if state.generation != generation || !state.pendingRestore || state.pendingText != pastedText {
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return
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}
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current := currentDarwinClipboardSnapshot()
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if !shouldRestoreDarwinClipboard(
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state.generation,
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generation,
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state.pendingRestore,
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state.pendingText,
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pastedText,
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current,
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) {
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state.pendingRestore = false
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return
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}
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restoreDarwinClipboardSnapshot(restoreTo)
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state.pendingRestore = false
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}
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func shouldRestoreDarwinClipboard(currentGeneration, restoreGeneration uint64, pending bool, pendingText, pastedText string, current darwinClipboardSnapshot) bool {
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if currentGeneration != restoreGeneration || !pending || pendingText != pastedText {
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return false
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}
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return current.hasText && current.text == pastedText
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}
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func restoreDarwinClipboardSnapshot(snapshot darwinClipboardSnapshot) {
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if !snapshot.hasText {
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C.clearClipboardText()
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return
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}
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cText := C.CString(snapshot.text)
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defer C.free(unsafe.Pointer(cText))
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C.setClipboardText(cText)
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}
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