helputils.py 文件源码

def UsageString(component, trace=None, verbose=False):
  """Returns a string showing how to use the component as a Fire command."""
  command = trace.GetCommand() + ' ' if trace else ''

  if inspect.isroutine(component) or inspect.isclass(component):
    spec = inspectutils.GetFullArgSpec(component)
    return _UsageStringFromFullArgSpec(command, spec)

  if isinstance(component, (list, tuple)):
    length = len(component)
    if length == 0:
      return command
    if length == 1:
      return command + '[0]'
    return command + '[0..{cap}]'.format(cap=length - 1)

  completions = completion.Completions(component, verbose)
  if command:
    completions = [''] + completions
  return '\n'.join(command + end for end in completions)