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A python framwork to write large CLIs using dependency injection

Project description

======
bigcli
======


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A python framework to write large CLIs. The concept is to automagically derive CLI commands and args based on the object graph of a callable class that implements a CLI command (command name is derived from the class name). It uses argparse_ to create the CLI parser and pinject_ as the Dependency_Injection_ engine. You implement a class - e.g.: ``DoSomething``- and that generates the name of a subcommand - e.g: ``do-something``. Then, based on the dependencies of class ``DoSomething``, we will derive the arguments, e.g.: if ``DoSomething`` depends on ``Dependency``, which in turn declares ``__args__ = [bigcli.arg('--option', required=False, help='help')]`` (add_argument_ method from argparse_), then command ``do-something`` will have a '--option' argument.

In theory, the auto-generation of arguments should enables and encourage the reuse of internal components for rapid development of consistent and testable rich CLIs, especially those that operate platforms.

* Free software: MIT license
* Documentation: https://bigcli.readthedocs.io.

Minimal example:
-------

.. code-block:: python

#!/usr/bin/env python
import bigcli


class Dependency(object):
__args__ = [
bigcli.arg('--option') # short for ``lambda p: p.add_argument('--option')``
]

def __init__(self, args):
self.option = args.option


class Command(object):
__parent__ = 'sub-command'
__depends_on__ = [Dependency]

def __init__(self, dependency):
self.dependency = dependency

def __call__(self):
print "dependency option: {}".format(self.dependency.option)


if __name__ == "__main__":
bigcli.BigCli(commands=[Command]).execute()


# $ ./example.py sub-command command --option value
# > dependency option: value


Features (see tests for example)
--------

* Auto generates parsers and commands using the ``__depends_on__`` and ``__args__`` attributes.
* Supports adding single subcommand using the ``__parent__ = 'subcommand'`` attribute.

Known Issues:
-------------

* Only supports python 2.7 because pinject_ only supports python 2.7.
* Class names should have more than a single letter (pinject know issue, not documented anywhere AFAIK).

Credits
---------

This package was created with Cookiecutter_ and the `audreyr/cookiecutter-pypackage`_ project template.
.. _Dependency_Injection: https://en.wikipedia.org/wiki/Dependency_injection
.. _Cookiecutter: https://github.com/audreyr/cookiecutter
.. _`audreyr/cookiecutter-pypackage`: https://github.com/audreyr/cookiecutter-pypackage
.. _add_argument: https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser.add_argument
.. _argparse: https://docs.python.org/2/howto/argparse.html
.. _pinject: https://github.com/google/pinject


=======
History
=======

0.1.0 (2017-07-25)
------------------

* First release on PyPI.


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0.1.3

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