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Name: argcomplete
Version: 0.6.9
Summary: Bash tab completion for argparse
Home-page: https://github.com/kislyuk/argcomplete
Author: Andrey Kislyuk
Author-email: kislyuk@gmail.com
License: Apache Software License
Description: argcomplete - Bash completion for argparse
==========================================
*Tab complete all the things!*
Argcomplete provides easy, extensible command line tab completion of arguments for your Python script.
It makes two assumptions:
* You're using bash or zsh as your shell
* You're using `argparse <http://docs.python.org/2.7/library/argparse.html>`_ to manage your command line arguments/options
Argcomplete is particularly useful if your program has lots of options or subparsers, and if your program can
dynamically suggest completions for your argument/option values (for example, if the user is browsing resources over
the network).
Installation
------------
::
pip install argcomplete
activate-global-python-argcomplete
See `Activating global completion`_ below if the second step reports an error.
Refresh your bash environment (start a new shell or ``source /etc/profile``).
Synopsis
--------
Python code (e.g. ``my-awesome-script.py``):
.. code-block:: python
#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK
import argcomplete, argparse
parser = argparse.ArgumentParser()
...
argcomplete.autocomplete(parser)
args = parser.parse_args()
...
Shellcode (only necessary if global completion is not activated - see `Global completion`_ below), to be put in e.g. ``.bashrc``::
eval "$(register-python-argcomplete my-awesome-script.py)"
argcomplete.autocomplete(*parser*)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This method is the entry point to the module. It must be called **after** ArgumentParser construction is complete, but
**before** the ``ArgumentParser.parse_args()`` method is called. The method looks for an environment variable that the
completion hook shellcode sets, and if it's there, collects completions, prints them to the output stream (fd 8 by
default), and exits. Otherwise, it returns to the caller immediately.
.. admonition:: Side effects
Argcomplete gets completions by running your program. It intercepts the execution flow at the moment
``argcomplete.autocomplete()`` is called. After sending completions, it exits using ``exit_method`` (``os._exit``
by default). This means if your program has any side effects that happen before ``argcomplete`` is called, those
side effects will happen every time the user presses ``<TAB>`` (although anything your program prints to stdout or
stderr will be suppressed). For this reason it's best to construct the argument parser and call
``argcomplete.autocomplete()`` as early as possible in your execution flow.
Specifying completers
---------------------
You can specify custom completion functions for your options and arguments. Two styles are supported: callable and
readline-style. Callable completers are simpler. They are called with the following keyword arguments:
* ``prefix``: The prefix text of the last word before the cursor on the command line. All returned completions should begin with this prefix.
* ``action``: The ``argparse.Action`` instance that this completer was called for.
* ``parser``: The ``argparse.ArgumentParser`` instance that the action was taken by.
* ``parsed_args``: The result of argument parsing so far (the ``argparse.Namespace`` args object normally returned by
``ArgumentParser.parse_args()``).
Completers should return their completions as a list of strings. An example completer for names of environment
variables might look like this:
.. code-block:: python
def EnvironCompleter(prefix, **kwargs):
return (v for v in os.environ if v.startswith(prefix))
To specify a completer for an argument or option, set the ``completer`` attribute of its associated action. An easy
way to do this at definition time is:
.. code-block:: python
from argcomplete.completers import EnvironCompleter
parser = argparse.ArgumentParser()
parser.add_argument("--env-var1").completer = EnvironCompleter
parser.add_argument("--env-var2").completer = EnvironCompleter
argcomplete.autocomplete(parser)
If you specify the ``choices`` keyword for an argparse option or argument (and don't specify a completer), it will be
used for completions.
A completer that is initialized with a set of all possible choices of values for its action might look like this:
.. code-block:: python
class ChoicesCompleter(object):
def __init__(self, choices=[]):
self.choices = choices
def __call__(self, prefix, **kwargs):
return (c for c in self.choices if c.startswith(prefix))
The following two ways to specify a static set of choices are equivalent for completion purposes:
.. code-block:: python
from argcomplete.completers import ChoicesCompleter
parser.add_argument("--protocol", choices=('http', 'https', 'ssh', 'rsync', 'wss'))
parser.add_argument("--proto").completer=ChoicesCompleter(('http', 'https', 'ssh', 'rsync', 'wss'))
The following `script <https://raw.github.com/kislyuk/argcomplete/master/docs/examples/describe_github_user.py>`_ uses
``parsed_args`` and `Requests <http://python-requests.org/>`_ to query GitHub for publicly known members of an
organization and complete their names, then prints the member description:
.. code-block:: python
#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK
import argcomplete, argparse, requests, pprint
def github_org_members(prefix, parsed_args, **kwargs):
resource = "https://api.github.com/orgs/{org}/members".format(org=parsed_args.organization)
return (member['login'] for member in requests.get(resource).json() if member['login'].startswith(prefix))
parser = argparse.ArgumentParser()
parser.add_argument("--organization", help="GitHub organization")
parser.add_argument("--member", help="GitHub member").completer = github_org_members
argcomplete.autocomplete(parser)
args = parser.parse_args()
pprint.pprint(requests.get("https://api.github.com/users/{m}".format(m=args.member)).json())
`Try it <https://raw.github.com/kislyuk/argcomplete/master/docs/examples/describe_github_user.py>`_ like this::
./describe_github_user.py --organization heroku --member <TAB>
Readline-style completers
~~~~~~~~~~~~~~~~~~~~~~~~~
The readline_ module defines a completer protocol in rlcompleter_. Readline-style completers are also supported by
argcomplete, so you can use the same completer object both in an interactive readline-powered shell and on the bash
command line. For example, you can use the readline-style completer provided by IPython_ to get introspective
completions like you would get in the IPython shell:
.. _readline: http://docs.python.org/2/library/readline.html
.. _rlcompleter: http://docs.python.org/2/library/rlcompleter.html#completer-objects
.. _IPython: http://ipython.org/
.. code-block:: python
import IPython
parser.add_argument("--python-name").completer = IPython.core.completer.Completer()
Printing warnings in completers
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Normal stdout/stderr output is suspended when argcomplete runs. Sometimes, though, when the user presses ``<TAB>``, it's
appropriate to print information about why completions generation failed. To do this, use ``warn``:
.. code-block:: python
from argcomplete import warn
def AwesomeWebServiceCompleter(prefix, **kwargs):
if login_failed:
warn("Please log in to Awesome Web Service to use autocompletion")
return completions
Global completion
-----------------
In global completion mode, you don't have to register each argcomplete-capable executable separately. Instead, bash
will look for the string **PYTHON_ARGCOMPLETE_OK** in the first 1024 bytes of any executable that it's running
completion for, and if it's found, follow the rest of the argcomplete protocol as described above.
.. admonition:: Bash version compatibility
Global completion requires bash support for ``complete -D``, which was introduced in bash 4.2. On older
systems, you will need to update bash to use this feature. Check the version of the running copy of bash with
``echo $BASH_VERSION``.
.. note:: If you use setuptools/distribute ``scripts`` or ``entry_points`` directives to package your module,
argcomplete will follow the wrapper scripts to their destination and look for ``PYTHON_ARGCOMPLETE_OK`` in the
destination code.
Activating global completion
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The script ``activate-global-python-argcomplete`` will try to install the file
``bash_completion.d/python-argcomplete.sh`` (`see on GitHub`_) into an appropriate location on your system
(``/etc/bash_completion.d/`` or ``~/.bash_completion.d/``). If it
fails, but you know the correct location of your bash completion scripts directory, you can specify it with ``--dest``::
activate-global-python-argcomplete --dest=/path/to/bash_completion.d
Otherwise, you can redirect its shellcode output into a file::
activate-global-python-argcomplete --dest=- > file
The file's contents should then be sourced in e.g. ``~/.bashrc``.
.. _`see on GitHub`: https://github.com/kislyuk/argcomplete/blob/master/argcomplete/bash_completion.d/python-argcomplete.sh
Acknowledgments
---------------
Inspired and informed by the optcomplete_ module by Martin Blais.
.. _optcomplete: http://pypi.python.org/pypi/optcomplete
Links
-----
* `Project home page (GitHub) <https://github.com/kislyuk/argcomplete>`_
* `Documentation (Read the Docs) <https://argcomplete.readthedocs.org/en/latest/>`_
* `Package distribution (Crate) <https://crate.io/packages/argcomplete>`_ `(PyPI) <http://pypi.python.org/pypi/argcomplete>`_
Bugs
~~~~
Please report bugs, issues, feature requests, etc. on `GitHub <https://github.com/kislyuk/argcomplete/issues>`_.
License
-------
Licensed under the terms of the `Apache License, Version 2.0 <http://www.apache.org/licenses/LICENSE-2.0>`_.
.. image:: https://travis-ci.org/kislyuk/argcomplete.png
:target: https://travis-ci.org/kislyuk/argcomplete
.. image:: https://pypip.in/v/argcomplete/badge.png
:target: https://crate.io/packages/argcomplete
.. image:: https://pypip.in/d/argcomplete/badge.png
:target: https://crate.io/packages/argcomplete
Platform: MacOS X
Platform: Posix
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Operating System :: MacOS :: MacOS X
Classifier: Operating System :: POSIX
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Unix Shell
Classifier: Development Status :: 4 - Beta
Classifier: Topic :: Software Development :: Libraries :: Python Modules
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