dj-command 0.5.0

Run commands with `dj {command_name}`. Uses aliases defined in a simple config file or defaults to Django management commands.

Why?

It is available everywhere if you install via pip, has cute aliases defined in a JSON file (.dj-config.json) per project, will run as many commands as you want, and defaults to Django management commands if an alias cannot be found.

Commands can be run sequentially by dj (e.g. dj makemigrations migrate). However, calling a long-running process (e.g. dj runserver) will prevent any other commands from being run. For example, dj runserver migrate will never run the migrate command because runserver will block the process.

Configuration file

Example .dj-config.toml

disable_django_management_command = false
python_interpreter = "python"
environment_file_path = ".env"

[[commands]]
name = "m"
help = "Does the migration dance"
execute = "./manage.py makemigrations && ./manage.py migrate"
requires_virtualenv = true

[[commands]]
name = "r"
help = "Runs all the servers"
execute = "./manage.py runserver"
requires_virtualenv = true
long_running = true

[[commands]]
name = "ls"
help = "Lists all the files, of course"
execute = "ls"

[[commands]]
name = "up"
help = "Up all the things"
execute = "pip3 install -r requirements/development.txt && ./manage.py migrate && ./manage.py runserver"
requires_virtualenv = true
long_running = true

[[commands]]
name = "restore_database"
help = "Restores a Postgres database from live to local"
execute = "PGPASSWORD=$PGPASSWORD pg_dump $DATABASE_NAME --host=$DATABASE_HOST --port=$DATABASE_PORT --username=$DATABASE_USERNAME --format=tar | pg_restore --clean --dbname=$DATABASE_NAME --no-owner --host=localhost --port=5432"

Config file location

If the --config argument is used to specify a particular file location, that is the only place dj looks for a configuration file.

Otherwise, dj will search for appropriate config files and "merge" them together. This allows you to have a base config file in ~/.dj-config.toml, but override it on a per-folder basis. dj prioritizes .toml config files over .json. So, it will look for ~/.dj-config.toml first and, if it's missing, then look for ~/.dj-config.json. Then, it will follow the same pattern for the current directory. The current directory's config file will take precedence if there is an overlap in configuration settings.

Using environment variables in commands

dj will look for a .env file to load environment variables using the wonderful python-dotenv library. You can specify environment variables in an execute command just like you would from the shell (i.e. $VARIABLE_NAME).

Basic arguments and options

• dj --help to see all of the options
• dj --list to see all of the available custom commands
• dj {command_name} to run a custom command or Django management command (e.g. dj migrate)
• dj {command_name} {command_name} {command_name} to run multiple commands (e.g. dj makemigrations migrate)
• dj {command_name} --dry_run to show what commands would run without actually executing them

How to work on the source

1. Clone the repo
2. Run the source locally: poetry run python dj
3. Test the source: poetry run pytest
4. Build and install locally: poetry build && pip3 install --user --force-reinstall .
5. Test with ~/.local/bin/dj migrate
6. Publish the source to pypi: poetry publish --build --username USERNAME --password PASSWORD

Acknowledgements

• poetry: please, please, please continue to help wrangle the complexity of 1) creating Python projects, and 2) installing dependencies; seriously, it's baffling out there without you
• click: ridiculously full-featured library to help implement CLI programs in Python; it has all the bells and most of the whistles
• attrs: would you like easy classes in Python? yes, please
• delegator.py: subprocess is a pain, but delegator hides all the ugly cruft behind a nice API
• python-dotenv: 12-factor all the things with .env files
• toml: the fewer braces in my life the better

Prior art

This isn't a new idea and there are a few other implementations out there that do similar things. But, uh, I like mine. 😀

• dj-cmd
• Django-dj
• dj-cli