git like commands in python

Question

My goal is to have

myScript init without more run the class/action InitAction.
myScript foo /tmp run the class/action FooAction using the given "/tmp"

With argparse I made up this parser

parser = argparse.ArgumentParser(description="Look like GIT!")

parserCommands = parser.add_subparsers(title="Actions")

init_parser = parserCommands.add_argument('init', help='Set up')
destroy_parser = parserCommands.add_parser('destroy', help='Tear down')

Good till here but I want to bind init to the InitAction(argparse.Action). Something that works like action=InitAction but unfortunately this isn't allowed there.

Do you have a clue how to run InitAction when writing myScript.py init in the terminal?

Community · Accepted Answer · 2020-06-20 09:12:55Z

The argparse documentation has an example of calling functions based on the subparser command

16.4.5.1. Sub-commands

One particularly effective way of handling sub-commands is to combine the use of the add_subparsers() method with calls to set_defaults() so that each subparser knows which Python function it should execute. For example:

>>> # create the parser for the "foo" command
>>> parser_foo = subparsers.add_parser('foo')
>>> ...
>>> parser_foo.set_defaults(func=foo)
...
>>> # parse the args and call whatever function was selected
>>> args = parser.parse_args('foo 1 -x 2'.split())
>>> args.func(args)

Following that is an example using the 'dest':

the dest keyword argument to the add_subparsers() call will work'

I don't think you want to subclass argparse.Action. Normally an Action puts a value in the args namespace. The 'init' string is actually a value that subparsers Action uses to pass control to the init_parser. That's why your own Action class does not fit. What you want is function that can be run after parse_args is done, and all it needs to use is args.

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