Open the app's folder in Processing, cross-platform

appfolder.pde

import java.awt.Desktop;

void setup(){
  openAppFolderHandler();
}

void openAppFolderHandler(){
  String os = "Mac OS X";
  try{
    os = System.getProperty("os.name");
    println("OS appears to be " + os + ".");
  }catch(Exception e){
    println("Couldn't determine OS.");
  }
  if(os.charAt(0)==char('W')&&os.charAt(1)==char('i')&&os.charAt(2)==char('n')){
    try{
      print("Trying Windows method.");
      Desktop.getDesktop().open(new File(sketchPath("")));
    }catch(Exception e){ }
  }else{
    try{
      print("Trying OS X/Linux method.");
      open(sketchPath(""));
    }catch(Exception e){ }
  }
}