argparse-autogen 1.4
Parser with automatic creation of parsers and subparsers for paths.
License: MIT License
Keywords: python,argparse,generate

argparse-autogen
================

|PyPI| |PyPI| |PyPI version| |GitHub release| |Build Status| |codecov|
|GitHub license|

Parser with automatic creation of parsers and subparsers for paths.

Installation
------------

Supported versions of python: **``3.3+``** (because of
inspect.Signature, which was introduced in python 3.3)

.. code:: shell

    pip install argparse-autogen

Usage
-----

``argparse_autogen.EndpointParser`` is intended to replace basic
``argparse.ArgumentParser``. It extends subparsers creation logic, and
adds a new special method ``add_endpoint``.

Simple example:

.. code:: python

    import argparse_autogen

    class MyCli():
      def do_stuff(self, target, force=False):
        """
        This does cool stuff!
        
        :param str target: Target to execute a cool stuff
        :param bool force: Force doing cool stuff
        """
        print(target, force)

    cli = MyCli()

    parser = argparse_autogen.EndpointParser()
    parser.add_endpoint('do_stuff', cli.do_stuff)
    parser.parse_and_call(['do_stuff', 'my target']) # this will print "my target false"
    parser.parse_and_call(['do_stuff', '--force', 'my target']) # this will print "my target true"

``add_endpoint`` method is clever enough to parse methods docstring and
add corresponding helps in arguments. For example,
``parser.parse_args(['do_stuff', '--help'])`` in above example will show
something like

::

    usage: example.py do_stuff [-h] [--force]

    This does cool stuff!

    optional arguments:
      -h, --help  show this help message and exit
      --force     Force doing cool stuff

This magic is done by ``argparse_autogen.autospec`` function. It
introspects function signature, and adds corresponding argparse
arguments to parser. ``**kwargs`` are supported and can be passed as
``[key=value [key=value ...]]``. You can override argument settings by
passing ``argument_overrides`` option to ``add_endpoint``. This must be
a ``dict[str, dict]`` where keys are parameter name, and values are
parameters to override defaults passed to ``parser.add_argument``

More endpoint examples
----------------------

Nested class and complex paths:

.. code:: python

    import argparse_autogen

    class MyCli():
      def __init__(self):
        self.users = self.Users()
        self.groups = self.Groups()
      
      class Users():
        def get(self, user_id): pass
        def list(self, **filter): pass
        def set_roles(self, user_id, *role): pass
        def update(self, user_id, **fields): pass
       
      class Groups():
        def get(self, group_id): pass

    cli = MyCli()

    parser = argparse_autogen.EndpointParser()

    parser.add_endpoint('users.get', cli.users.get, argument_overrides={'user_id': {'help': 'Users id'}})
    parser.add_endpoint('users.list', cli.users.list)
    parser.add_endpoint(cli.users.update) 
    # this will use __qualname__ of update func as path, lowercased and trailing and ending underscores removed.
    # The first item of qualname is skipped, so it would be `users.update`, not `mycli.users.update`

    # Alternatively, you can use autogeneration of paths and endpoints:
    # parser.generate_endpoints(cli.users, root_path='users', endpoint_kwargs={'users.get': {'argument_overrides': {'user_id': {'help': 'Users id'}}}})
    # Will create endpoints from class methods.

    groups_get_parser = parser.add_endpoint('groups get', cli.groups.get, autospec=False)
    groups_get_parser.add_argument('group_id', help='Group id')

    users_parser = parser.get_endpoint_parser('users')
    users_parser.description = 'Users operations'

    parser.parse_and_call()

History
-------

1.2 (2017-03-01)
~~~~~~~~~~~~~~~~

-  Ability to automatically generate path from func's qualname

1.1 (2017-02-28)
~~~~~~~~~~~~~~~~

-  Filter args from func signature in call method #1

1.0 (2017-02-26)
~~~~~~~~~~~~~~~~

-  First release

0.1 (2017-02-25)
~~~~~~~~~~~~~~~~

-  Initial commit

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   :target: https://travis-ci.org/sashgorokhov/argparse-autogen
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