parameters: (env)
docstring: Check, whether the tool exists
docstring_summary: Check, whether the tool exists
docstring_tokens: Check whether the tool exists
function: def exists(env):
      """ Check, whether the tool exists """
      try:
          return _xgettext_exists(env)
      except:
          return False
function_tokens: def exists ( env ) : try : return _xgettext_exists ( env ) except : return False