argdispatch 🐈 Drop-in replacement for `argparse` dispatching subcommand calls to functions, modules or binaries
================================================================================================================
If your parser has a few subcommands, you can parse them with ``argparse``. If you have more, you still can, but you will get a huge, unreadable code. This module makes this easier by dispatching subcommand calls to functions, modules or binaries.
Examples
--------
Example 1 : Manual definition of subcommands
""""""""""""""""""""""""""""""""""""""""""""
For instance, consider the following code for ``mycommand.py``:
.. code-block:: python
import sys
from argdispatch import ArgumentParser
def foo(args):
"""A function associated to subcommand `foo`."""
print("Doing interesting stuff")
sys.exit(1)
if __name__ == "__main__":
parser = ArgumentParser()
subparser = parser.add_subparsers()
subparser.add_function(foo)
subparser.add_module("bar")
subparser.add_executable("baz")
parser.parse_args()
With this simple code:
* ``mycommand.py foo -v --arg=2`` is equivalent to the python code ``foo(['-v', '--arg=2'])``;
* ``mycommand.py bar -v --arg=2`` is equivalent to ``python -m bar -v --arg=2``;
* ``mycommand.py baz -v --arg=2`` is equivalent to ``baz -v --arg=2``.
Then, each function, module or binary does whatever it wants with the arguments.
Example 2 : Automatic definition of subcommands
"""""""""""""""""""""""""""""""""""""""""""""""
With programs like `git <http://git-scm.com/>`_, if a ``git-foo`` binary exists, then calling ``git foo --some=arguments`` is equivalent to ``git-foo --some=arguments``. The following code, in ``myprogram.py`` copies this behaviour:
.. code-block:: python
import sys
from argdispatch import ArgumentParser
if __name__ == "__main__":
parser = ArgumentParser()
subparser = parser.add_subparsers()
subparser.add_submodules("myprogram")
subparser.add_prefix_executables("myprogram-")
parser.parse_args()
With this program, given that binary ``myprogram-foo`` and python module ``myprogram.bar.__main__.py`` exist:
* ``myprogram foo -v --arg=2`` is equivalent to ``myprogram-foo -v --arg=2``;
* ``myprogram bar -v --arg=2`` is equivalent to ``python -m myprogram.bar -v --arg=2``.
Example 3 : Defining subcommands with entry points
--------------------------------------------------
Now that your program is popular, people start writing plugins. Great! You want to allow them to add subcommands to your program. To do so, simply use this code:
.. code-block:: python
import sys
from argdispatch import ArgumentParser
if __name__ == "__main__":
parser = ArgumentParser()
subparser = parser.add_subparsers()
# You probably should only have one of those.
subparser.add_entrypoints_functions("myprogram.subcommand.function")
subparser.add_entrypoints_modules("myprogram.subcommand.module")
parser.parse_args()
With this code, plugin writers can add lines like those in their ``setup.cfg``:
.. code-block:: cfg
[options.entry_points]
myprogram.subcommand.function =
foo = mypluginfoo:myfunction
myprogram.subcommand.module =
bar = mypluginbar
Then, given than function ``myfunction()`` exists in module ``mypluginfoo``, and than module ``mypluginbar`` exists:
* ``myprogram foo -v --arg=2`` is equivalent to the python code ``myfunction(['-v', '--arg=2'])``;
* ``myprogram bar -v --arg=2`` is equivalent to ``python -m mypluginbar -v --arg=2``.
Documentation
"""""""""""""
The complete documentation is available on `readthedocs <http://argdispatch.readthedocs.io>`_.
To compile it from source, download and run::
cd doc && make html
What's new?
-----------
See `changelog <https://framagit.org/spalax/argdispatch/blob/main/CHANGELOG.md>`_.
Download and install
--------------------
* From sources:
* Download: https://pypi.python.org/pypi/argdispatch
* Install (in a `virtualenv`, if you do not want to mess with your distribution installation system)::
python3 -m pip install .
* From pip::
pip install argdispatch
* Quick and dirty Debian (and Ubuntu?) package
This requires `stdeb <https://github.com/astraw/stdeb>`_ to be installed::
python3 setup.py --command-packages=stdeb.command bdist_deb
sudo dpkg -i deb_dist/argdispatch-<VERSION>_all.deb
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"description": "argdispatch \ud83d\udc08 Drop-in replacement for `argparse` dispatching subcommand calls to functions, modules or binaries\n================================================================================================================\n\nIf your parser has a few subcommands, you can parse them with ``argparse``. If you have more, you still can, but you will get a huge, unreadable code. This module makes this easier by dispatching subcommand calls to functions, modules or binaries.\n\nExamples\n--------\n\nExample 1 : Manual definition of subcommands\n\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\n\nFor instance, consider the following code for ``mycommand.py``:\n\n.. code-block:: python\n\n import sys\n from argdispatch import ArgumentParser\n\n def foo(args):\n \"\"\"A function associated to subcommand `foo`.\"\"\"\n print(\"Doing interesting stuff\")\n sys.exit(1)\n\n if __name__ == \"__main__\":\n parser = ArgumentParser()\n subparser = parser.add_subparsers()\n\n subparser.add_function(foo)\n subparser.add_module(\"bar\")\n subparser.add_executable(\"baz\")\n\n parser.parse_args()\n\nWith this simple code:\n\n* ``mycommand.py foo -v --arg=2`` is equivalent to the python code ``foo(['-v', '--arg=2'])``;\n* ``mycommand.py bar -v --arg=2`` is equivalent to ``python -m bar -v --arg=2``;\n* ``mycommand.py baz -v --arg=2`` is equivalent to ``baz -v --arg=2``.\n\nThen, each function, module or binary does whatever it wants with the arguments.\n\nExample 2 : Automatic definition of subcommands\n\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\n\nWith programs like `git <http://git-scm.com/>`_, if a ``git-foo`` binary exists, then calling ``git foo --some=arguments`` is equivalent to ``git-foo --some=arguments``. The following code, in ``myprogram.py`` copies this behaviour:\n\n.. code-block:: python\n\n import sys\n from argdispatch import ArgumentParser\n\n if __name__ == \"__main__\":\n parser = ArgumentParser()\n subparser = parser.add_subparsers()\n\n subparser.add_submodules(\"myprogram\")\n subparser.add_prefix_executables(\"myprogram-\")\n\n parser.parse_args()\n\nWith this program, given that binary ``myprogram-foo`` and python module ``myprogram.bar.__main__.py`` exist:\n\n* ``myprogram foo -v --arg=2`` is equivalent to ``myprogram-foo -v --arg=2``;\n* ``myprogram bar -v --arg=2`` is equivalent to ``python -m myprogram.bar -v --arg=2``.\n\nExample 3 : Defining subcommands with entry points\n--------------------------------------------------\n\nNow that your program is popular, people start writing plugins. Great! You want to allow them to add subcommands to your program. To do so, simply use this code:\n\n.. code-block:: python\n\n import sys\n from argdispatch import ArgumentParser\n\n if __name__ == \"__main__\":\n parser = ArgumentParser()\n subparser = parser.add_subparsers()\n\n # You probably should only have one of those.\n subparser.add_entrypoints_functions(\"myprogram.subcommand.function\")\n subparser.add_entrypoints_modules(\"myprogram.subcommand.module\")\n\n parser.parse_args()\n\nWith this code, plugin writers can add lines like those in their ``setup.cfg``:\n\n.. code-block:: cfg\n\n [options.entry_points]\n myprogram.subcommand.function =\n foo = mypluginfoo:myfunction\n myprogram.subcommand.module =\n bar = mypluginbar\n\nThen, given than function ``myfunction()`` exists in module ``mypluginfoo``, and than module ``mypluginbar`` exists:\n\n* ``myprogram foo -v --arg=2`` is equivalent to the python code ``myfunction(['-v', '--arg=2'])``;\n* ``myprogram bar -v --arg=2`` is equivalent to ``python -m mypluginbar -v --arg=2``.\n\nDocumentation\n\"\"\"\"\"\"\"\"\"\"\"\"\"\n\nThe complete documentation is available on `readthedocs <http://argdispatch.readthedocs.io>`_.\n\nTo compile it from source, download and run::\n\n cd doc && make html\n\nWhat's new?\n-----------\n\nSee `changelog <https://framagit.org/spalax/argdispatch/blob/main/CHANGELOG.md>`_.\n\nDownload and install\n--------------------\n\n* From sources:\n\n * Download: https://pypi.python.org/pypi/argdispatch\n * Install (in a `virtualenv`, if you do not want to mess with your distribution installation system)::\n\n python3 -m pip install .\n\n* From pip::\n\n pip install argdispatch\n\n* Quick and dirty Debian (and Ubuntu?) package\n\n This requires `stdeb <https://github.com/astraw/stdeb>`_ to be installed::\n\n python3 setup.py --command-packages=stdeb.command bdist_deb\n sudo dpkg -i deb_dist/argdispatch-<VERSION>_all.deb\n",
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