Skip completion for specific argument

[dirk-thomas]

I would like a specific argument (e.g. --foo) to not appear in the completion. Since the application is pretty modular I can't configure e.g. the global CompletionFinder. I found the option to set help=argparse.SUPPRESS but I still want a help text to be shown for --help.

I was thinking if something like this would be feasible:

arg = parser.add_argument('--foo', help='awesome option')
arg.completer = False

If anyone could be give me some pointers I am happy to provide a PR for this feature idea.

[kislyuk]

Sounds like a good idea. My preference would be to create a special completer class in https://github.com/kislyuk/argcomplete/blob/master/argcomplete/completers.py, class SuppressCompleter or something like that, and then its optional strings will be suppressed from completions. So you'd say:

arg = parser.add_argument('--foo', help='awesome option')
arg.completer = argcomplete.completers.SuppressCompleter

You need to add the new class, logic to

argcomplete/argcomplete/__init__.py

Lines 348 to 350 in e72c5fb

	for action in parser._actions:
	if action.help == argparse.SUPPRESS and not self.print_suppressed:
	continue

(same branch path as the one triggered by argparse.SUPPRESS), and a test.

[dirk-thomas]

@kislyuk Thank you for the detailed pointers. Based on that I was able to create #224. Beside on test related question on that PR it seemed pretty straight forward.