SimpleGitHooks

Write pretty and concise Git hooks in Python. SimpleGitHooks lets you write an entire Git hook directly in Python, without using YAML. It’s ideal when you want full control and all your logic contained in a single file.

• Installing
• Hooks
  • PreCommit
  • PrePush
• Common config
  • Ignoring files
    • Support for Python's pathlib.Path pattern matching
  • Filter results
  • Check commands which RC=0 means failure
• Creating a symlink
  • Troubleshooting
• License

Installing

You can install via pip:

pip install simplegithooks

Hooks

PreCommit

Write simple pre-commit Git hook in your .git/hooks/pre-commit:

#!/usr/bin/env python
from simplegithooks import PreCommit

pre_commit = PreCommit(__file__)
pre_commit.add_ignored_file("src/simplegithooks/pre-commit.py")
pre_commit.check_content_for("FIXME", "❌", "error")
pre_commit.check_content_for("NotImplemented", "🚧", "fail")
pre_commit.check_content_for("TODO", "⚠️", "warning", prevent=False)
pre_commit.check_command("ruff check")
print(pre_commit.results())
print(pre_commit.summary())
exit(pre_commit.rc)

Let's say you have such file in staged changes main_1.py because you've forgot to finish:

import math

def add(b, c):
    # TODO add typing
    return b + c

def divide(a, b):
    # FIXME secure dividing by zero
    return a / b

def sqrt():
    raise NotImplementedError

And when you try to commit this file using git commit -m "message" the output will be:

What happened here? Let's focus only on checks that prevents us from commit this change:

• by default all checks prevents commit, unless you explicitly pass prevent=False
• check_content_for("FIXME", "❌", "error") failed because FIXME was found in main_1.py
• check_content_for("NotImplemented", "🚧", "fail") failed because NotImplemented was found in main_1.py
• check_command("ruff check") failed because command ruff check returned non-zero output (because of unused import math)

Then if you fix issues the code now looks more on less like this:

import math

def add(b, c):
    # TODO add typing
    return b + c

def divide(a, b):
    try:
        return a / b
    except Exception:
        return float("inf")

def sqrt(x):
    return math.sqrt(x)

The output after commit will be:

Now check_content_for("TODO", "⚠️", "warning", prevent=False) failed because TODO was found in main_1.py, yet this is not preventing us from commit changes, so commit command was succeeded but with warningCommit allowed conditionally.

Still we can do better 😉, so let's try harder:

import math
from typing import Any

def add(b:Any, c:Any):
    return b + c

def divide(a, b):
    try:
        return a / b
    except Exception:
        return float("inf")

def sqrt(x):
    return math.sqrt(x)

Finally we reached our goal:

PrePush

Write simple pre-push Git hook in your .git/hooks/pre-push:

#!/usr/bin/env python
import sys

from simplegithooks import GitHook, PrePushConfig

pre_push = GitHook(__file__, PrePushConfig())
pre_push.add_ignored_files(["pre_push_example.py", "*.svg", "README.md"])
pre_push.check_command("rm -rf build/")
pre_push.check_command("rm -rf dist/")
pre_push.check_command("pytest")
print(pre_push.results())
print(pre_push.summary())
sys.exit(pre_push.rc)

You'll get similar outputs like for pre-commit.

Common config

Ignoring files

pre_commit.add_ignored_file("src/obsolete.py")
pre_commit.add_ignored_files(["src/stub1.py", "src/stub2.py"])

Support for Python's pathlib.Path pattern matching

pre_commit.add_ignored_files(["pre-commit.py", "*.svg", "README.md"])

Filter results

print(pre_commit.results("error"))
print(pre_commit.results("warning"))
print(pre_commit.results("error", preventing_only=True))
print(pre_commit.results("warning", preventing_only=True))

Check commands which RC=0 means failure

pre_commit.check_command("true", rc_zero_succes=False)  # ❯ true (ERROR, RC!=0 SUCCESS) 🔒
pre_commit.check_command("false", rc_zero_succes=False) # ❯ false (OK, RC!=0 SUCCESS)

Creating a symlink

Run simplegithooks pre-commit --install path/to/pre_commit.py or simplegithooks pre-push --install path/to/pre_push.py to create a symlink for you repository:

If a hook file already exists, an additional message e.g. WARNING: file '/home/user/project/.git/hooks/pre-commit' already exists and will be overwritten. will be shown as below

Troubleshooting

If you pass a bad hook name you'll receive a hint if there is a typo e.g. Unknown or unsupported hook: preccomyt, did you mean: pre-commit

In case of any problem while creating a symlink you'll get Failure, couldn't create the symbolic link. instead of success message.

License

This repository is licensed under the MIT License