Skip to main content

A python framwork to write large CLIs using dependency injection

Project description


.. image::

.. image::

.. image::
:alt: Documentation Status

.. image::
:alt: Updates

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:

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__":

# $ ./ 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).


This package was created with Cookiecutter_ and the `audreyr/cookiecutter-pypackage`_ project template.

.. _Dependency_Injection:
.. _Cookiecutter:
.. _`audreyr/cookiecutter-pypackage`:
.. _add_argument:
.. _argparse:
.. _pinject:


0.1.0 (2017-07-25)

* First release on PyPI.

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for bigcli, version 0.2.0
Filename, size File type Python version Upload date Hashes
Filename, size bigcli-0.2.0-py2.py3-none-any.whl (6.4 kB) File type Wheel Python version py2.py3 Upload date Hashes View
Filename, size bigcli-0.2.0.tar.gz (14.4 kB) File type Source Python version None Upload date Hashes View

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring DigiCert DigiCert EV certificate Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page