Skip to main content

Tackle is a declarative DSL for building modular workflows and code generators. Tool is plugins based and can easily be extended by writing additional hooks or importing external providers that can be turned into a self documenting CLI, all out of yaml, json, toml.

Project description


pypi python codecov codeql

Tackle is an experimental general purpose configuration language for building modular code generators and declarative CLIs. Built as a fork of cookiecutter, it can make any config file into a CLI with both strong and weakly typed programmable flow control common to a general purpose programming language. Basically you can write a fully functional Turing-complete program out of a config file. It's wild.

With tackle, you can build:

  • Modular code generators / repo scaffolding tools that can be updated over time
  • Interactive glue code for infrastructure-as-code deployment strategies
  • Generic utilities like SSH helpers and dotfile managers
  • Combinations of all of the above and anything else you can think of

If this project gets enough adoption / stars, it will be re-written in a compiled language, either Go or Rust. Give it a star if you'd like to see that.



Note: tackle can install dependencies on its own. Check docs for advanced installation methods to isolate tackle from your system python.

python -m venv env && source env/bin/activate
pip install tackle

Quick Demo: tackle sudoblockio/tackle-hello-world

Hello world

Check out the docs for >10 hello worlds that demonstrate the various aspects of the syntax with the simplest one using the print hook, one of >100 hooks.


# Any time a key ends with `->`, we are calling a hook
hw->: print Hello world!

To run, call tackle hello.yaml. Can also be version controlled -> tackle sudoblockio/tackle-hello-world.

Can also use loops, conditionals, and other base methods.


    - Hello
    - cruel
    - world!
one liner->: print {{item}} --for the.words --if "item != 'cruel'"
multiple lines:
  ->: print
  objects: {{item}}
    - Hello
    - world!
  if: item != 'cruel'
# Or combinations of the above with other methods like try/except

New hooks can be made in python which under the hood is a pydantic model.


from tackle import BaseHook

class Greeter(BaseHook):
    hook_type: str = "greeter"
    target: str
    args: list = ['target']
    def exec(self):
      expression = f"Hello {}"
      return expression

Or can be defined inline within your tackle file, imported remotely, or in a hooks directory..


# Keys ending with `<-` mean we are creating a hook / method
  target: str
  args: ['target']
    expression->: var Hello {{target}}  # var hook renders variables
    p->: print {{expression}}
  return: expression

And both can be called the same way.


hello: world!
With a flag->: greeter --target {{hello}}
Target in argument->: greeter {{hello}}
Expanded fields:
  ->: greeter
  target: {{hello}}
Jinja template->: {{ greeter(hello) }}
# Or combinations jinja and compact / expanded hooks allowing chaining of hook calls.

With the declarative hooks being callable from the command line:

tackle hello.yaml greeter --target world!
# Or from a github repo
tackle sudoblockio/tackle-hello-world greeter --target world!

Documentation can be embedded into the hooks.


  help: This is the default hook
    type: union[str, int]
    default->: input
    description: The thing to say hello to
    greeting->: select Who to greet? --choices ['world',target]
    hi->: greeter --target {{greeting}}
    help: A method that greets
    # ... Greeting options / logic
    extends: greeter
  help: A reusable greeter object
  target: str
    hi->: print Hello {{target}}

Which when running tackle hello.yaml help produces its own help screen.

usage: tackle hello.yaml [--target]

This is the default hook

    --target [str] The thing to say hello to
    greeting-method     A method that greets
    greeter     A reusable greeter object

Hooks can be imported within a tackle provider or through hooks, linked, and/or combined with inheritance or composition creating a web of CLIs.

Use Cases

WIP Tutorials

  • Declarative Utilities
  • Infrastructure-as-Code Management
  • Kubernetes Manifest Management
  • Toolchain Management


Known Issues

  • Windows Support
    • tackle is lacking some windows support as shown in the failed tests. If you are a windows user, it is highly recommended to use WSL. Please get in touch if you are motivated to fix these tests to make tackle fully cross-platform. It probably isn't that hard to fix them as they mostly are due to differences in how windows handles paths.
  • Whitespaces
    • tackle relies heavily on parsing based on whitespaces which if you are not careful can easily bite you. Whenever you need to have some whitespaces preserved, make sure to quote the entire expression. Future work will be put in to overhaul the regex based parser with a PEG parser like parsimonious.


Contributions are welcome but please be advised of the following notes.

  • This project uses conventional commits which generates the changelog with release-please-action in the release CI workflow. If commits have been made outside of this convention they will be squashed accordingly.
  • For making changes to providers, please include test coverage using the existing fixtures and patterns from prior tests or communicate any suggestions that deviate from this style. It definitely can be improved but consistency is more important than making directed improvements. Tests should be runnable from the test's directory and via make test.
  • For making changes to the core parser, please create a proposal first outlining your suggestions with examples before spending time working on code.

It is very easy to create new providers / hooks with tackle. Over time, it will adopt the same import pattern of what Ansible does where all provider / hooks (modules) are stored in version controlled locations. In the meantime, please feel free to contribute to this repository for hooks that have general applicability or create your own hooks in other repositories that are more bespoke / opinionated in nature.

Code of Conduct

Everyone interacting in the tackle project's codebases, issue trackers, chat rooms, and mailing lists is expected to follow the PyPA Code of Conduct.


Special thanks to the cookiecutter community for laying the basis for this project.

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

tackle-0.5.1.tar.gz (198.3 kB view hashes)

Uploaded Source

Built Distribution

tackle-0.5.1-py2.py3-none-any.whl (268.2 kB view hashes)

Uploaded Python 2 Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page