public static String findCeylonScript(File defaultValue,Project project){
  String scriptName=getScriptName("ceylon");
  if (defaultValue != null) {
    if (!defaultValue.exists())     throw new BuildException("Failed to find '" + scriptName + "' executable in "+ defaultValue.getPath());
    if (!defaultValue.canExecute())     throw new BuildException("Cannot execute '" + scriptName + "' executable in "+ defaultValue.getPath()+ " (not executable)");
    return defaultValue.getAbsolutePath();
  }
  File ceylonHome=null;
  try {
    ceylonHome=LauncherUtil.determineHome();
  }
 catch (  URISyntaxException e) {
    throw new BuildException("Failed to determine Ceylon home",e);
  }
  if (ceylonHome == null)   throw new BuildException("Failed to find Ceylon home, specify the ceylon.home property or set the CEYLON_HOME environment variable");
  File script=new File(new File(ceylonHome,"bin"),scriptName);
  if (!script.exists())   throw new BuildException("Failed to find '" + scriptName + "' executable in "+ ceylonHome);
  if (!script.canExecute())   throw new BuildException("Cannot execute '" + scriptName + "' executable in "+ ceylonHome+ " (not executable)");
  return script.getAbsolutePath();
}

public static String findCeylonScript ( File defaultValue , Project project ) { String scriptName = getScriptName ( "ceylon" ) ; if ( defaultValue != null ) { if ( ! defaultValue . exists ( ) ) throw new BuildException ( "Failed to find '" + scriptName + "' executable in " + defaultValue . getPath ( ) ) ; if ( ! defaultValue . canExecute ( ) ) throw new BuildException ( "Cannot execute '" + scriptName + "' executable in " + defaultValue . getPath ( ) + " (not executable)" ) ; return defaultValue . getAbsolutePath ( ) ; } File ceylonHome = null ; try { ceylonHome = LauncherUtil . determineHome ( ) ; } catch ( URISyntaxException e ) { throw new BuildException ( "Failed to determine Ceylon home" , e ) ; } if ( ceylonHome == null ) throw new BuildException ( "Failed to find Ceylon home, specify the ceylon.home property or set the CEYLON_HOME environment variable" ) ; File script = new File ( new File ( ceylonHome , "bin" ) , scriptName ) ; if ( ! script . exists ( ) ) throw new BuildException ( "Failed to find '" + scriptName + "' executable in " + ceylonHome ) ; if ( ! script . canExecute ( ) ) throw new BuildException ( "Cannot execute '" + scriptName + "' executable in " + ceylonHome + " (not executable)" ) ; return script . getAbsolutePath ( ) ; }
tries to find the given script either user - specified or detected
