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// Map right-side Option to Enter in OS X // by Henrik Nyh <http://henrik.nyh.se> 2008-03-15. // Free to modify and redistribute with credit. // // Based on http://www.osxbook.com/book/bonus/chapter2/alterkeys/. // // See http://henrik.nyh.se/2008/03/map-option-to-enter for what this application does. // // Compile like: // gcc -Wall -o opt2enter opt2enter.c -framework ApplicationServices -arch i386 -arch ppc // and put the binary in /usr/local/bin. Then keep the app running by sticking // // <?xml version="1.0" encoding="UTF-8"?> // <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> // <plist version="1.0"> // <dict> // <key>KeepAlive</key> // <true/> // <key>Label</key> // <string>name.henriknyh.opt2enter</string> // <key>Program</key> // <string>/usr/local/bin/opt2enter</string> // <key>RunAtLoad</key> // <true/> // </dict> // </plist> // // in /Library/LaunchDaemons/name.henriknyh.opt2enter.plist and running the command // sudo launchctl load -w /Library/LaunchDaemons/name.henriknyh.opt2enter.plist // // Half-broken bonus feature: // Enter is only sent if you press no other key at the same // time; otherwise it still sends Option. So you can still e.g. use // right-Option plus "." for ellipsis. Half-broken because you'll get // a line break too, after you hit Option and before you hit "." // TODO: Fix this by attaching to keyup instead? But then we'd need to // make sure we don't send Option+Enter, and keep-pressed-for-multiples // would become trickier. // // TODO: Respect other modifiers, so eg Ctrl+Enter works. // TODO: Bit logic instead of just checking integer. Necessary for the "other modifiers" TODO. // TODO: Keeping it pressed should send multiple Enters every few milliseconds. // // http://gemma.apple.com/documentation/Carbon/Reference/QuartzEventServicesRef/Reference/reference.html // is a helpful reference for parts of this code. #include <ApplicationServices/ApplicationServices.h> const CGKeyCode ENTER = (CGKeyCode)76; const CGKeyCode RIGHT_OPT = (CGKeyCode)61; const int RIGHT_OPT_DOWN = 524608; const int MODIFIER_UP = 256; CGEventRef myCGEventCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) { CGKeyCode keycode = (CGKeyCode)CGEventGetIntegerValueField(event, kCGKeyboardEventKeycode); CGEventFlags modifiers = CGEventGetFlags(event); // Debug // printf("Type: %i Modifiers: %i Keycode: %i\n", type, (int)modifiers, keycode); if (modifiers == RIGHT_OPT_DOWN && keycode == RIGHT_OPT) { // Debug // printf("Swap!\n"); CGEventRef press, release; press = CGEventCreateKeyboardEvent(NULL, ENTER, true); release = CGEventCreateKeyboardEvent(NULL, ENTER, false); CGEventPost(kCGHIDEventTap, press); CGEventPost(kCGHIDEventTap, release); } return event; } int main(void) { CFMachPortRef eventTap; CFRunLoopSourceRef runLoopSource; CGEventFlags oldFlags = CGEventSourceFlagsState(kCGEventSourceStateCombinedSessionState); eventTap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap, 0, CGEventMaskBit(kCGEventFlagsChanged), myCGEventCallback, &oldFlags); if (!eventTap) { fprintf(stderr, "Failed to create event tap!\n"); exit(1); } runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0); CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes); CGEventTapEnable(eventTap, true); CFRunLoopRun(); exit(0); }

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