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HitchKey

HitchKey is a multiplatform project python task runner.

It can tie together building code, running tests, generating docs, linting and any other automated tasks under one command line interface environment running in docker, either in windows, mac or linux.

It runs ad hoc tasks from a file called key.py with an isolated, self-updating python 3 virtualenv. Installing packages for use by your tasks is as simple as adding their names in the requirements file and running your task.

It is especially well suited to team projects as the project can be used to build consistent development environments and development tasks that are more or less invariant no matter which machine

hitch/key.py

from commandlib import CommandError, Command, python, python_bin
from hitchrun import DIR, expected

# Usable path.py objects -- https://pathpy.readthedocs.io/en/stable/api.html

# DIR.gen -- build directory (~/.hitch/xxxxxx, where the symlink 'gen' links to)
# DIR.project -- the directory containng the "hitch" folder.
# DIR.key -- the directory this file - key.py is in.
# DIR.share -- ~/.hitch/share - build folder shared build artefacts.
# DIR.cur -- the directory "hk" was run in.


# If "expected" is used, no stacktrace will be displayed for that exception
@expected(CommandError)
def hello(argument):
    """
    Try running "hk hello world".
    """
    # https://pathpy.readthedocs.io/en/stable/api.html
    DIR.gen.joinpath("hello.txt").write_text(argument)

    # https://hitchdev.com/commandlib/
    Command("cat", "hello.txt").in_dir(DIR.gen).run()


@expected(CommandError)
def runcommand():
    """
    Run python 3 code with the hk virtualenv.
    """
    python("pythoncode.py").run()             # run python code using this project's virtualenv
    python_bin.python("pythoncode.py").run()  # equivalent

hitch/hitchreqs.in:

hitchrun
# add python packages here and they will be installed automagically
$ hk

Usage: hk command [args]

       hello - Try running "hk hello world".
  runcommand - Run python 3 code with the hk virtualenv.

Run 'hk help [command]' to get more help on a particular command.


  hk --upgradepip - Upgrade hitch virtualenv's setuptools and pip
     hk --upgrade - Upgrade all dependencies in hitchreqs.in
  hk --cleanshare - Delete ~/.hitch/share/ folder.
       hk --clean - Delete gen folder

Getting started

On windows:

hk --demo key

hk helloworld

This will create a new directory called "hitch" and put five things in there:

  • key.py - the methods which you can run with "hk command".
  • gen - a symlink to the gen folder (e.g. ~/.hitch/ltnd0x) which contains the hitchkey's python 3 virtualenv and build folder.
  • hitchreqs.in - the python packages which you want installed in this virtualenv.
  • hitchreqs.txt - the compiled and frozen list of all the packages (does not need to be edited by hand).
  • __pycache__ - folder containing the compiled version of key.py.

If you open hitch/key.py in a text editor and poke around and run 'hk' in that folder you can see what it is capable of.

Using hitchkey when you already have a key.py

Once installed, you can simply cd to any project directory with a key.py file or a hitch/key.py file and run 'hk' and it will set up the environment, installing all the packages specified in hitchreqs.txt.

Why hitchkey instead of make/pyinvoke/rake?

This project grew out of a bash script that I kept creating repeatedly called "dev.sh" that I used to keep in the root of every project. I would use it to run various development environment workflow tasks like rebuilding code, running tests or deploying.

Over time I found myself building more and more complex workflows, and it became easier just to use python and its ecosystem of packages.