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Gallium - A Micro CLI Framework for Python

Gallium Framework is designed to eliminate the need of setting up bootstrap and allow fast-pace CLI development where it only relies on built-in libraries such as ArgumentParser to let the developers define the argument in the way commonly known to any Python developers without asking them to learn new things.

So, the user can use run gallium <sub-command> [...] where the subcommands are imported and defined in cli.json from the current working directory.

To override the default path of the configuration file, just run as GA_CONF=/path/to/config/anyname.json gallium ....

Please remember that when you are in doubt, use the classic -h or --help to find out more.

How to install

You can install either with PIP by executing pip3 install gallium or by using

This will install the supplied executables for both Python 3.

This only supports Python 3.4 or newer.

Supplied Executables

For UNIX, BSD, Linux and Mac OS X Only,

  • gallium and g3 use Python 3 interpreter.

For Windows, see the section regarding to Windows way below.


Here is the desired syntax.

    "paths": [
        /* optional, additional python paths */
    "services": [
        /* optional, paths to the XML configuration for an Imagination Framework app

            This is the setup with Imagination Framework (
    "imports": [
        /* optional, fully qualified class names, e.g., "sampleapp.cli.BasicHW"
            where the module name is "sampleapp.cli" and the class name is "BasicHW".

            This is the basic setup.
    "settings": {
        /* optional, shared settings across all commands. */

The name of each subcommand is defined by either ICommand.identifier() for any commands via the basic setup or the ID of the command entity defined in the setup with Imagination Framework (the identifier method will be ignored in this type of setup).

See an example from the sample folder.

How Gallium read configuration

The supplied Gallium interface (gallium and g3) will read the configuration files in the following order.

  • /usr/local/gallium/etc/config.json (the system-wide config file)
  • ~/.gallium/config.json (the user config file)
  • ./cli.json (the local config file)


As the goal is to allow developers to get started on writing what really matters instead of implementing the setup like a digital janitor, the basic implementation only requires the pure-old-Python class. For example, here is a basic command.

# imaginary module name: sampleapp.cli
from gallium.interface import ICommand

class HelloWorld(ICommand):
    def identifier(self):
        return 'hi'

    def define(self, parser):

    def execute(self, args):

Then, you can call this command by executing gallium hi or g3 hi.

Prompt the user for input

gallium.interface.ICommand.ask(message, choices : dict = None, default = None, repeat_limit = None, kind : type = None, validate : callable = None)

(Added in Version 1.0.0a4)

Ask the user for response.

The parameter message will is the message when the prompt is triggered. For example, suppose this is implemented in g3 init

# in an ICommand instance
full_name = self.ask('What is the app name?')

Sample output:

$ g3 init
What is the app name?: ▌

The parameter choices is to limited user response to a certain set of possible answers.

# in an ICommand instance
confirmation = self.ask(
    'Are you sure?',
    choices = ['yes', 'no']

Sample output:

$ g3 init
... (omitted) ...
Are you sure? [yes/no]: ▌

The parameter default is the default response.

# in an ICommand instance
confirmation = self.ask(
    'Are you sure?',
    choices = ['yes', 'no'],
    default = 'no'

Sample output:

$ g3 init
... (omitted) ...
Are you sure? [yes/no] (no): ▌

The parameter repeat_limit is to allow the user to correct invalid response. By default, there is no retry (repeat_limit is 1).

The parameter kind is the type of the response.

The parameter validate is the callable to validate the input outside the simple restricting options. The callable must take only one parameter which is of the given data type (default to string). The callable also must return None or True on valid response. Otherwise, it must return False (generic error will be used) or raise AssertionError which the custom error message from the error object will be used.

gallium.interface.ICommand.stand_by(self, message, delay, on_sigint = None)

(Added in Version 1.0.0a4)

Stand by and wait until the user sends SIGINT via keyboard.

Incorporating with Imagination Framework

Simply define an ICommand class as an entity, e.g.,

    <entity id="apple" class="sampleapp.cli.HellowWorld"/>
    <!-- ... -->

Then, you can call this command by executing gallium apple.

Extend the core.

You can extend the core by implement gallium.interface.IExtension. Please check out the extentions for Imagination Framework and Passerine ORM with Gallium Core


Limited supports on Windows

The support for Windows 10 is added since version 0.8.

Please note that the command line will be installed but not usable as it is designed to work with Bash or UNIX/BSD/Linux shell. It might work when Microsoft releases the updates for Windows 10 with Bash.

Until then, you can create a Python script with the following code.

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from gallium.starter   import main

if __name__ == '__main__':
    main() # which requires "cli.json"

    # Alternatively you can pass a config dictionary like this:
    # main({
    #     'imports': [
    #         # ...
    #     ]
    # })