Routine to determine profile directory

def locateProfileDir():
    """
    Locate the Chandler repository.
    The location is determined either by parameters, or if not specified, by
    the presence of a .chandler directory in the users home directory.
    """
      # if a profileDir is specified then just use it
    if application.Globals.options.profileDir:
        application.Globals.options.profileDir = os.path.expanduser(application.Globals.options.profileDir)
    else:
        profileDir = None
        homeDir    = os.path.expanduser('~')
        macDir     = os.path.join(homeDir, 'Library', 'Application Support')

          # try to find any existing directories
        dirs = [ os.path.join(homeDir, '.chandler'),    # look in posix home dir
                 os.path.join(macDir, 'Chandler'),      # special case for OS/X
                 application.Globals.chandlerDirectory, # finally look in the application dir
               ]
    
        for path in dirs:
            if path:
                path = os.path.expanduser(path)
      
                if os.path.isdir(path): 
                    if os.path.isdir(os.path.join(path, '__repository__')):
                        profileDir = path
                        break

          # if not found, then figure out where to create one
        if not profileDir:
            if os.path.isdir(homeDir):
                if os.path.isdir(macDir):
                    profileDir = os.path.join(macDir, 'Chandler')
                else:
                    profileDir = os.path.join(homeDir, '.chandler')
                
                os.mkdir(profileDir)
            else:
                profileDir = application.Globals.chandlerDirectory
  
        application.Globals.options.profileDir = profileDir