ls2sl for mac

ls2sl.cc

//g++ -framework ApplicationServices ls2sl.cc
//enable [System Preferences -> Universal Access -> Access for assistive devices]
#include <stdio.h>
#include <ApplicationServices/ApplicationServices.h>
#include <sys/time.h>

#define BUFSIZE 100
int keyBuffer[BUFSIZE];
struct timeval timeBuffer[BUFSIZE];

int bufferIndex=0;
void push(int key){
  int i=bufferIndex%BUFSIZE;
  bufferIndex++;
  keyBuffer[i]=key;
  gettimeofday(timeBuffer+i,NULL);
}
int get(int i){
  if(i>=bufferIndex||i>=BUFSIZE)return -1;
  return keyBuffer[(bufferIndex-i-1)%BUFSIZE];
}
double getTime(int i){
  if(i>=bufferIndex||i>=BUFSIZE)return 1.0E+512;
  struct timeval time;
  gettimeofday(&time,NULL);
  int index=(bufferIndex-i-1)%BUFSIZE;
  return time.tv_sec-timeBuffer[index].tv_sec-(time.tv_usec-timeBuffer[index].tv_usec)/1000000.0;
}
CGEventRef keyFilter(CGEventTapProxy proxy,CGEventType type,CGEventRef event,void *refcon){
  CGEventFlags flags=CGEventGetFlags(event);
  //printf("flag=%d\n",(int)flags);
  if(type==kCGEventFlagsChanged){
    push(-1);
  }else if(type==kCGEventKeyDown){
    int key=CGEventGetIntegerValueField(event,kCGKeyboardEventKeycode);
    if(flags==256)push(key);
    else push(-1);
    //printf("%d %d %d\n",get(2),get(1),get(0));
    if(get(2)==37&&get(1)==1&&get(0)==36&&(getTime(3)-getTime(2)>0.4||get(3)==36)&&getTime(2)-getTime(1)<0.2&&getTime(1)<2){
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,51,true));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,51,false));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,51,true));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,51,false));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,1,true));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,1,false));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,37,true));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,37,false));
      CGEventTapPostEvent(proxy,CGEventCreateKeyboardEvent(NULL,36,true));
      return NULL;
    }
  }
  return event;
}

int main(){
  int mask=0;
  mask|=CGEventMaskBit(kCGEventFlagsChanged);
  mask|=CGEventMaskBit(kCGEventKeyUp);
  mask|=CGEventMaskBit(kCGEventKeyDown);

  CFMachPortRef eventTap=CGEventTapCreate(kCGHIDEventTap,kCGHeadInsertEventTap,kCGEventTapOptionDefault,mask,keyFilter,NULL);
  CFRunLoopSourceRef runLoopSourceRef=CFMachPortCreateRunLoopSource(NULL,eventTap,0);
  CFRunLoopAddSource(CFRunLoopGetCurrent(),runLoopSourceRef,kCFRunLoopDefaultMode);
  CFRunLoopRun();
}