taskr-cli 1.1.0

A language agnostic make-like tool meant for python projects

Taskr

A magical, zero dependency, easy to use task runner with an original name. Inspired by Mage, a task runner for go. Made for python projects, but usable for any.

All that's needed is a tasks.py file.

A few highlights

• Basically make(1) without a build system
• Zero dependencies
• Auto load environment variable files
• Easily pass arguments
• Auto generated cli docs
• Usable in any subdirectory of your project
• Built functions to easily run system commands inside venvs
• Built in helper functions for python development

Installing

pip install taskr-cli

Check the version

taskr --version

Generate a default tasks file

taskr --init

Using

Make sure you have a tasks.py file defined in the root of your repo. taskr can be used from any sub directory if PYENV_DIR or 'TASKR_DIR' is set to the projects root. There is a utility function "injectPath()" that can do this for you, included in the template. See other utility functions at the bottom of the readme.

CLI:

[master●] » taskr -h
usage: taskr [-h] [-v] [-l] [-i]

A small utility to run tasks

optional arguments:
  -h, --help     show this help message and exit
  -v, --version  Show the version number
  -l, --list     Show defined tasks
  -i, --init     Generate a template task file

When listing tasks, taskr will attempt to grab either the docblock or a single # comment above the function name and show it for cli documentation. Taskr will prefer the single # comment over the docblock to display if both exist.

Also note, any functions in tasks.py that start with an underscore are ignored when listing.

[master●] » taskr -l

Tasks:
 all         : Runs all static analysis tools
 build       : Builds the wheel
 clean       : Remove build artifacts, cache, etc.
 flake       : Check flake8
 fmt         : Run black
 mypy        : Checks types
 *reinstall  : Re-installs taskr
 sort        : Sort imports
 test        : Run tests
 upload_prod : Send it for real!
 upload_test : Send it!

* = default

To run a task, just pass the name of a function. Output from a task will be displayed

[master●] » taskr format
All done! ✨ 🍰 ✨
11 files left unchanged.

Configuration Variables

There are a few configuration setting, set in tasks.py itself.

Placing VENV_REQUIRED = True in your tasks.py file, taskr will only run if it detects it's running in a virtual environment. You can delete it otherwise

Default tasks are run when taskr is run without any arguments. You can set this by setting a variable DEFAULT = "some_func" to the name of a task in tasks.py.

If you want an environment file to be loaded before every task, set ENV = path/to/file.env at the top of tasks.py

from taskr import runners

DEFAULT = "test"
VENV_REQUIRED = True
ENVS = "dev.env"

# Run tests, and passed dev.env vars when running
def test
  runners.run("python -m pytest tests/")

Helpful functions for running tasks

A few task running methods are provided for system running tasks. Taskr expects task functions to return either True (The task was successful) for Falseit failed. To determine if a subprocess/system call was successful or not, taskr looks at the return code of the called program. 0 is success, anything else fails.

Taskr will auto copy your existing environment variables when running tasks, so running tasks with programs installed in a virual environment (i.e. dev tools though pip) will work.

You can also run any code you want as well under a task, these are just helpful wrappers around subprocess that work nicely with taskr.

run

run's argument can be either a list, or a string. A list is parsed into one command, not multiple

Optionally pass a an environment dictionary to be used at runtime.

from taskr import runners

# Run flake8
def flake_list() -> bool:
    return runners.run(["python", "-m", "flake8", "taskr/*.py"])

# Run tests
def flake() -> bool:
    return runners.run("python -m pytest tests/ -v")

# Build a wheel
def build():
  ENV = {
    "PRODUCTION": "true"
  }
  return runners.run("python setup.py install", ENV)

run_conditional

run_conditional is a way to run tasks (functions) in order, as long as the previous task returns a non failure return code (False). You can throw normal python functions in here to

from taskr import runners
import some_package as sp

# Run black
def fmt():
    return runners.run("python -m black .")

# Check flake8
def flake():
    return runners.run(["python", "-m", "flake8", "taskr/*.py"])

# Run all static tools
def all():
    return runners.run_conditional(flake, fmt, sp.function)

run_output

run_output' will run a command and return the output

from taskr import runners

# Get the number of env variables
def _get_count():
    ret = runners.run_output("env | wc -l")
    print(ret.status) # True 
    print(ret.stdout) # "90"
    print(ret.sterr)  # ""

You can an environment dict to this function.

Passing arguments to functions

You can also pass arbitrary arguments to any defined function. For example, passing the environment to starting a server. This requires the function to have a default argument set.

def start(env: str = "Dev"):
  ENVS = {
    "ENV": env
    "WATCH": "true"
  }
  return taskr.run("python start.py", ENVS)

And from the command line

taskr start dev
# Or
taskr start
# Or
taskr start prod

You can also use key word arguments so pass only selected arguments. This requires all previous arguments to have a default value.

def start(env: str = "dev", timeout: int = 180):
  ENVS = {
    "ENV": env
    "WATCH": "true"
    "TIMEOUT": timeout
  }
  return taskr.run("python start.py", ENVS)

Only passing timeout in this example, and keeping env to be the default dev

taskr start timeout=60

Utilities

There are a few utility functions included, mostly for python package development.

from taskr import utils

# Removes dist/build folders
utils.cleanBuilds()

# Remove compiled files and folders
utils.cleanCompiles()

# In a venv or not
utils.inVenv()

# Transforms an ENV file into a dict
utils.readEnvFile(filename)

# Bumps setup.py's version number by 0.0.1, or replaces it with argument
utils.bumpVersion(version=None):

# Adds `export TASKR_DIR=CWD' to your VENV activation, so
# you can use taskr from any location in the VENV (e.g. sub directories)
utils.addTaskrToEnv()

Developing

This project uses pipenv. Make sure it's installed. Then call

python -m pipenv shell
pipenv install --dev
taskr check
taskr test

There are numerous tests in taskr/tests which cover most functionality that's testable, as well as examples