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argparse: Allow usage without optspecs

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It's still useful without, for instance to implement a command that
takes no options, or to check min-args or max-args.

(technically no optspecs, no min/max args and --ignore-unknown does
nothing, but that's a very specific error that we don't need to forbid)

Fixes #9006
This commit is contained in:
Fabian Boehm
2022-06-27 16:59:12 +02:00
parent fee5a9125a
commit 993448d552
3 changed files with 26 additions and 19 deletions
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5
doc_src/cmds/argparse.rst
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@@ -64,10 +64,11 @@ If ``$argv`` is empty then there is nothing to parse and ``argparse`` returns ze
The ``or return`` means that the function returns ``argparse``'s status if it failed, so if it goes on ``argparse`` succeeded.
The ``--`` argument is required. You do not have to include any arguments after the ``--`` but you must include the ``--``. For example, this is acceptable::
The ``--`` argument is required. You do not have to include any option specifications or arguments after the ``--`` but you must include the ``--``. For example, this is acceptable::
set -l argv
set -l argv foo
argparse 'h/help' 'n/name' -- $argv
argparse --min-args=1 -- $argv
But this is not::