#29152: management commands rigid ArgumentParser initialization
-------------------------------------+-------------------------------------
Reporter: Dmitry | Owner: nobody
Type: New | Status: new
feature |
Component: Core | Version: 2.0
(Management commands) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Hello everyone.
Noticed today that there is no way to customize CommandParser
(ArgumentParser subclass), initialized in management commands
(https://github.com/django/django/blob/master/django/core/management/base.py#L227).
There is no option (or i was unable to find it - please correct me in this
case) to pass any kwargs in CommandParser constructor. The public method
create_parser contains some django-related hard-coded add_arguments calls,
so overriding it directly leads to some copy paste.
I needed to use some custom formatter for ArgumentParser
(https://docs.python.org/3/library/argparse.html?highlight=argparse#argparse.ArgumentDefaultsHelpFormatter)
to add default values to help page, but was unable to do this properly.
There is also some other usefull keyword arguments available in
ArgumentParser.
As a proposal a new method could be added to BaseCommand (let's say
BaseCommand.get_parser_instance), for example like this:
{{{
def get_parser_instance(self):
return CommandParser(
self, prog="%s %s" % (os.path.basename(prog_name),
subcommand),
description=self.help or None,
)
def create_parser(self, prog_name, subcommand)::
parser = self.get_parser_instance()
... etc
}}}
This should not break anything in BaseCommand, but will allow have more
control on parser's creation overriding just get_parser_instance method.
Please sorry for mistakes.
--
Ticket URL: <https://code.djangoproject.com/ticket/29152>
Django <https://code.djangoproject.com/>
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