julian3xl/clinner

Command Line Interface builder that helps creating an entry point for your application.

Clinner

Version:	1.6.2
Status:	Production/Stable
Author:	José Antonio Perdiguero López

Command Line Interface builder that helps creating an entry point for your application.

Check full Clinner documentation.

Quick start

1. Install this package using pip:

pip install clinner

2. Create a command

from clinner.command import command

@command
def foo(*args, **kwargs):
    return True

3. Create a main file:

from clinner.run.main import Main

if __name__ == '__main__':
    sys.exit(Main().run())

Commands

Commands are declared using a decorator to register given functions. Commands are functions with the follow parameters:

func

Function that will be called when command would be executed.

command_type

Type of the command, could be a bash or python command.

args

Parser arguments for this command.

parser_opts

Command subparser's keywords, such as description.

This decorator allows to be used as a common decorator without arguments, where default type (python) will be used:

@command
def foobar(bar):
    pass

Or specifying the type:

@command(command_type=Type.python)
def foobar(bar):
    pass

But also is possible to provide command line arguments, as expected by argparse.ArgumentParser.add_argument:

@command(args=((('-f', '--foo'), {'help': 'Foo argument that does nothing'}),                   # Command argument
               (('--bar',), {'action': 'store_true', 'help': 'Bar argument stored as True'})),  # Another argument
         parser_opts={'title': 'foobar_command', 'help': 'Help for foobar_command'})            # Parser parameters
def foobar(*args, **kwargs):
    pass

All commands will be registered in a command register that can be accessed through command.register. Each entry in this register is a dictionary with the fields declared at the beginning of this section.

Main

A main class is defined to ease the creation of command line applications. This class follows the process:

1. Create a parser using argparse.ArgumentParser for the application:

   1. Calling all add_arguments(parser) methods from all super classes, e.g: clinner.mixins.HealthCheckMixin.
   2. Addding a subparser for each command with their specific arguments.

2. Parse arguments using the argument parser created previously.

3. Inject variables into environment calling all super classes methods whose name starts with inject_.

4. Load settings module from CLINNER_SETTINGS environment variable. More details below.

Settings

Clinner settings can be specified through CLINNER_SETTINGS environment variable or using -s or --settings command line flags during invocation. The format to specify settings module or class should be either package.module or package.module:Class.

Default Arguments

Default arguments for commands. Let a command foo declared:

default_args = {
    'foo': ['-v', '--bar', 'foobar'],
}

Examples

Some Clinner examples.

Simple Main

Example of a simple main with two defined commands foo and bar.

#!/usr/bin/env python
import os
import shlex
import sys

from clinner.command import command, Type as CommandType
from clinner.run.main import Main


@command(command_type=CommandType.SHELL
         args=(('-i', '--input'),
               ('-o', '--output')))
def foo(*args, **kwargs):
    """List of foo commands"""
    ls_cmd = shlex.split('ls')
    wc_cmd = shlex.split('wc')
    wc_cmd += [kwargs['input'], kwargs['output']]

    return [ls_cmd, wc_cmd]


@command(command_type=CommandType.PYTHON)
def bar(*args, **kwargs):
    """Do a bar."""
    return True


if __name__ == '__main__':
    sys.exit(Main().run())

Builder Main

Example of main module with build utilities such as unit tests, lint, sphinx doc, tox and dist packaging:

#!/usr/bin/env python
import sys

from clinner.run import Main


class Build(Main):
    commands = (
        'clinner.run.commands.nose.nose',
        'clinner.run.commands.prospector.prospector',
        'clinner.run.commands.sphinx.sphinx',
        'clinner.run.commands.tox.tox',
        'clinner.run.commands.dist.dist',
    )


def main():
    return Build().run()


if __name__ == '__main__':
    sys.exit(main())