Metadata-Version: 2.3
Name: tach
Version: 0.5.3
Classifier: Programming Language :: Python :: 3
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Classifier: Development Status :: 4 - Beta
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: 3.12
Classifier: Programming Language :: Python :: 3 :: Only
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Software Development :: Quality Assurance
Requires-Dist: pyyaml ~=6.0
Requires-Dist: pydantic ~=2.0
Requires-Dist: rich ~=13.0
Requires-Dist: prompt-toolkit ~=3.0
Requires-Dist: stdlib-list >=0.10.0 ; python_version < '3.10'
Requires-Dist: eval-type-backport >=0.2.0 ; python_version < '3.10'
License-File: LICENSE
Summary: A Python tool to maintain a modular package architecture.
Keywords: python,module,package,guard,enforcement,boundary,enforcer,domain,architecture
Author-email: Caelean Barnes <caeleanb@gmail.com>, Evan Doyle <evanmdoyle@gmail.com>
Requires-Python: >=3.8
Description-Content-Type: text/markdown; charset=UTF-8; variant=GFM
Project-URL: Homepage, https://github.com/gauge-sh/tach
Project-URL: Issues, https://github.com/gauge-sh/tach/issues


# Tach

[![downloads](https://static.pepy.tech/badge/tach/month)](https://pepy.tech/project/tach)
[![version](https://img.shields.io/pypi/v/tach.svg)](https://pypi.Python.org/pypi/tach)
[![license](https://img.shields.io/pypi/l/tach.svg)](https://pypi.Python.org/pypi/tach)
[![python](https://img.shields.io/pypi/pyversions/tach.svg)](https://pypi.Python.org/pypi/tach)
[![ci](https://github.com/gauge-sh/tach/actions/workflows/ci.yml/badge.svg)](https://github.com/gauge-sh/tach/actions/workflows/ci.yml)
[![pyright](https://microsoft.github.io/pyright/img/pyright_badge.svg)](https://microsoft.github.io/pyright/)
[![ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)

a Python tool to enforce modular design, written in Rust.

[Docs](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/)

<div align="center">
    <img src="./logo.png" alt="gauge-logo" width="30%"  style="border-radius: 50%; padding-bottom: 20px"/>
</div>

Tach lets you define and enforce dependencies between Python modules in your project.

This enforces a decoupled, modular architecture, which makes maintenance and development easier. If a module tries to import from another module that is not listed as a dependency, `tach` will report an error.


Here's an example:

![tach_demo](https://github.com/gauge-sh/tach/assets/10570340/6fc1e9b4-5a78-4330-a329-9187bd9c374d)

Tach is:
- 🌎 Open source
- 🐍 Installable via pip
- 🔧 Able to be adopted incrementally
- ⚡  Implemented with no runtime impact
- ♾️ Interoperable with your existing systems (cli, hooks, ci, etc.)

## Getting Started

### Installation
```bash
pip install tach
```
### Setup
Tach allows you to configure where you want to place module boundaries in your project.

You can do this interactively! From the root of your python project, run:
```bash
 tach mod
# Up/Down: Navigate  Enter: Mark/unmark module  Right: Expand  Left: Collapse  Ctrl + Up: Jump to parent
# Ctrl + s: Exit and save  Ctrl + c: Exit without saving  Ctrl + a: Mark/unmark all
```
Mark and unmark each module boundary you want to create with 'Enter' (or 'Ctrl + a' to mark all sibling modules). Common choices would be to mark all of your top-level Python source packages, or just a few packages which you want to isolate.

Once you have marked all the modules you want to enforce constraints between, run:
```bash
tach sync
```
This will create the main configuration file for your project, `tach.yml`, with the dependencies that currently exist between each module you've marked.

You can then see what Tach has found by viewing the `tach.yml`'s contents: 
```
cat tach.yml
```

NOTE: Your 'project root' directory (the directory containing your `tach.yml`) will implicitly be treated as a module boundary, and may show up in your dependency constraints as '<root>'.

### Enforcement
Tach comes with a simple cli command to enforce the boundaries that you just set up! From the root of your Python project, run:
```bash
tach check
```
You will see:
```bash
✅ All module dependencies validated!
```

You can validate that Tach is working by either commenting out an item in a `depends_on` key in `tach.yml`, or by adding an import between modules that didn't previously import from each other. 

Give both a try and run `tach check` again. This will generate an error:
```bash
❌ path/file.py[LNO]: Cannot import 'path.other'. Tags ['scope:other'] cannot depend on ['scope:file']. 
```

### Extras

If an error is generated that is an intended dependency, you can sync your actual dependencies with `tach.yml`:
```bash
tach sync
```
After running this command, `tach check` will always pass.

If your configuration is in a bad state, from the root of your python project you can run: 
```bash
tach clean
```
This will wipe all the configuration generated and enforced by Tach.


If you just want to see the dependencies and usages of a given file or module in your project, you can use `tach report`.

```bash
tach report my_package/
# OR
tach report my_module.py
```

Tach also supports:
- [Manual file configuration](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/configuration/)
- [Strict public interfaces for modules](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/strict-mode/)
- [Inline exceptions](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/tach-ignore/)
- [Pre-commit hooks](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/usage/#tach-install)


More info in the [docs](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/). Tach logs anonymized usage statistics which are easily [opted out](https://gauge-sh.github.io/tach-python-modular-monorepo-framework-tool/faq/) of.
If you have any feedback, we'd love to talk!

If you have any questions or run into any issues, let us know by either reaching out on [Discord](https://discord.gg/a58vW8dnmw) or submitting a [Github Issue](https://github.com/gauge-sh/tach/issues)!

