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Name: argh
Version: 0.26.2
Summary: An unobtrusive argparse wrapper with natural syntax
Home-page: http://github.com/neithere/argh/
Author: Andrey Mikhaylenko
Author-email: neithere@gmail.com
License: GNU Lesser General Public License (LGPL), Version 3
Description: Argh: The Natural CLI
=====================
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Building a command-line interface? Found yourself uttering "argh!" while
struggling with the API of `argparse`? Don't like the complexity but need
the power?
.. epigraph::
Everything should be made as simple as possible, but no simpler.
-- Albert Einstein (probably)
`Argh` is a smart wrapper for `argparse`. `Argparse` is a very powerful tool;
`Argh` just makes it easy to use.
In a nutshell
-------------
`Argh`-powered applications are *simple* but *flexible*:
:Modular:
Declaration of commands can be decoupled from assembling and dispatching;
:Pythonic:
Commands are declared naturally, no complex API calls in most cases;
:Reusable:
Commands are plain functions, can be used directly outside of CLI context;
:Layered:
The complexity of code raises with requirements;
:Transparent:
The full power of argparse is available whenever needed;
:Namespaced:
Nested commands are a piece of cake, no messing with subparsers (though
they are of course used under the hood);
:Term-Friendly:
Command output is processed with respect to stream encoding;
:Unobtrusive:
`Argh` can dispatch a subset of pure-`argparse` code, and pure-`argparse`
code can update and dispatch a parser assembled with `Argh`;
:DRY:
The amount of boilerplate code is minimal; among other things, `Argh` will:
* infer command name from function name;
* infer arguments from function signature;
* infer argument type from the default value;
* infer argument action from the default value (for booleans);
* add an alias root command ``help`` for the ``--help`` argument.
:NIH free:
`Argh` supports *completion*, *progress bars* and everything else by being
friendly to excellent 3rd-party libraries. No need to reinvent the wheel.
Sounds good? Check the tutorial!
Relation to argparse
--------------------
`Argh` is fully compatible with `argparse`. You can mix `Argh`-agnostic and
`Argh`-aware code. Just keep in mind that the dispatcher does some extra work
that a custom dispatcher may not do.
Installation
------------
Using pip::
$ pip install argh
Arch Linux (AUR)::
$ yaourt python-argh
Examples
--------
A very simple application with one command:
.. code-block:: python
import argh
def main():
return 'Hello world'
argh.dispatch_command(main)
Run it:
.. code-block:: bash
$ ./app.py
Hello world
A potentially modular application with multiple commands:
.. code-block:: python
import argh
# declaring:
def echo(text):
"Returns given word as is."
return text
def greet(name, greeting='Hello'):
"Greets the user with given name. The greeting is customizable."
return greeting + ', ' + name
# assembling:
parser = argh.ArghParser()
parser.add_commands([echo, greet])
# dispatching:
if __name__ == '__main__':
parser.dispatch()
Of course it works:
.. code-block:: bash
$ ./app.py greet Andy
Hello, Andy
$ ./app.py greet Andy -g Arrrgh
Arrrgh, Andy
Here's the auto-generated help for this application (note how the docstrings
are reused)::
$ ./app.py help
usage: app.py {echo,greet} ...
positional arguments:
echo Returns given word as is.
greet Greets the user with given name. The greeting is customizable.
...and for a specific command (an ordinary function signature is converted
to CLI arguments)::
$ ./app.py help greet
usage: app.py greet [-g GREETING] name
Greets the user with given name. The greeting is customizable.
positional arguments:
name
optional arguments:
-g GREETING, --greeting GREETING 'Hello'
(The help messages have been simplified a bit for brevity.)
`Argh` easily maps plain Python functions to CLI. Sometimes this is not
enough; in these cases the powerful API of `argparse` is also available:
.. code-block:: python
@arg('text', default='hello world', nargs='+', help='The message')
def echo(text):
print text
The approaches can be safely combined even up to this level:
.. code-block:: python
# adding help to `foo` which is in the function signature:
@arg('foo', help='blah')
# these are not in the signature so they go to **kwargs:
@arg('baz')
@arg('-q', '--quux')
# the function itself:
def cmd(foo, bar=1, *args, **kwargs):
yield foo
yield bar
yield ', '.join(args)
yield kwargs['baz']
yield kwargs['quux']
Links
-----
* `Project home page`_ (GitHub)
* `Documentation`_ (Read the Docs)
* `Package distribution`_ (PyPI)
* Questions, requests, bug reports, etc.:
* `Issue tracker`_ (GitHub)
* `Mailing list`_ (subscribe to get important announcements)
* Direct e-mail (neithere at gmail com)
.. _project home page: http://github.com/neithere/argh/
.. _documentation: http://argh.readthedocs.org
.. _package distribution: http://pypi.python.org/pypi/argh
.. _issue tracker: http://github.com/neithere/argh/issues/
.. _mailing list: http://groups.google.com/group/argh-users
Author
------
Developed by Andrey Mikhaylenko since 2010.
See file `AUTHORS` for a complete list of contributors to this library.
Support
-------
The fastest way to improve this project is to submit tested and documented
patches or detailed bug reports.
Otherwise you can "flattr" me: |FlattrLink|_
.. _FlattrLink: https://flattr.com/submit/auto?user_id=neithere&url=http%3A%2F%2Fpypi.python.org%2Fpypi%2Fargh
.. |FlattrLink| image:: https://api.flattr.com/button/flattr-badge-large.png
:alt: Flattr the Argh project
Licensing
---------
Argh is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Argh is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Argh. If not, see <http://gnu.org/licenses/>.
Keywords: cli command line argparse optparse argument option
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: Intended Audience :: Information Technology
Classifier: License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Software Development :: User Interfaces
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Provides: argh
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