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# QMK CLI Development

This document has useful information for developers wishing to write new `qmk` subcommands.

# Overview

The QMK CLI operates using the subcommand pattern made famous by git. The main `qmk` script is simply there to setup the environment and pick the correct entrypoint to run. Each subcommand is a self-contained module with an entrypoint (decorated by `@cli.subcommand()`) that performs some action and returns a shell returncode, or None.

## Developer mode:

If you intend to maintain keyboards and/or contribute to QMK, you can enable the CLI's "Developer" mode:

`qmk config user.developer=True`

This will allow you to see all available subcommands.  
**Note:** You will have to install additional requirements:  
```bash
python3 -m pip install -r requirements-dev.txt
```

# Subcommands

[MILC](https://github.com/clueboard/milc) is the CLI framework `qmk` uses to handle argument parsing, configuration, logging, and many other features. It lets you focus on writing your tool without wasting your time writing glue code.

Subcommands in the local CLI are always found in `qmk_firmware/lib/python/qmk/cli`.

Let's start by looking at an example subcommand. This is `lib/python/qmk/cli/hello.py`:

```python
"""QMK Python Hello World

This is an example QMK CLI script.
"""
from milc import cli


@cli.argument('-n', '--name', default='World', help='Name to greet.')
@cli.subcommand('QMK Hello World.')
def hello(cli):
    """Log a friendly greeting.
    """
    cli.log.info('Hello, %s!', cli.config.hello.name)


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