Git Hooks Manager

Setup automated git hooks for pre-commit and pre-push workflows. Enforce code quality, run tests, format code, and prevent bad commits from reaching your repository.

What This Skill Does

• Creates pre-commit hooks (lint, format, test)
• Sets up pre-push hooks (full test suite)
• Installs commit-msg hooks (enforce conventions)
• Configures husky or manual hooks
• Prevents commits with failing checks
• Auto-formats code before commit

Instructions

Phase 1: Detect Project Type

Use Read to check:
- package.json → Node.js (use husky)
- pyproject.toml → Python (use pre-commit)
- .git/hooks → Manual hooks

Phase 2: Node.js Setup (Husky)

Install husky:

npm install --save-dev husky lint-staged
npx husky init

Configure package.json:

{
  "scripts": {
    "prepare": "husky"
  },
  "lint-staged": {
    "*.{js,jsx,ts,tsx}": [
      "eslint --fix",
      "prettier --write"
    ],
    "*.{json,md,yml}": [
      "prettier --write"
    ]
  }
}

Pre-commit hook (.husky/pre-commit):

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

echo "🔍 Running pre-commit checks..."

# Run linter
npm run lint || exit 1

# Format code
npx lint-staged || exit 1

# Run tests on staged files
npm test -- --findRelatedTests $(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(js|jsx|ts|tsx)$' | tr '\n' ' ') || exit 1

echo "✅ Pre-commit checks passed!"

Pre-push hook (.husky/pre-push):

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

echo "🔍 Running pre-push checks..."

# Run full test suite
npm test || exit 1

# Check types (if TypeScript)
npm run type-check || exit 1

# Build check
npm run build || exit 1

echo "✅ Pre-push checks passed!"

Commit-msg hook (.husky/commit-msg):

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

# Enforce conventional commits
npx --no -- commitlint --edit $1 || exit 1

Phase 3: Python Setup (pre-commit)

.pre-commit-config.yaml:

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.5.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
      - id: check-yaml
      - id: check-added-large-files
      - id: check-json
      - id: check-merge-conflict
      - id: detect-private-key

  - repo: https://github.com/psf/black
    rev: 23.12.1
    hooks:
      - id: black
        language_version: python3.11

  - repo: https://github.com/pycqa/flake8
    rev: 7.0.0
    hooks:
      - id: flake8
        args: ['--max-line-length=88', '--extend-ignore=E203']

  - repo: https://github.com/pycqa/isort
    rev: 5.13.2
    hooks:
      - id: isort
        args: ['--profile', 'black']

  - repo: https://github.com/pre-commit/mirrors-mypy
    rev: v1.8.0
    hooks:
      - id: mypy
        additional_dependencies: [types-all]

  - repo: local
    hooks:
      - id: pytest
        name: pytest
        entry: pytest
        language: system
        pass_filenames: false
        always_run: true

Install:

pip install pre-commit
pre-commit install
pre-commit install --hook-type commit-msg

Phase 4: Manual Hooks

For projects without package managers:

.git/hooks/pre-commit:

#!/bin/sh

echo "🔍 Running pre-commit checks..."

# Check for TODOs
if git diff --cached | grep -i "TODO"; then
    echo "❌ Found TODO comments. Please remove or track them properly."
    exit 1
fi

# Check for console.log
if git diff --cached --name-only | grep -E '\.(js|jsx|ts|tsx)$' | xargs grep -n "console\.log"; then
    echo "❌ Found console.log statements. Please remove them."
    exit 1
fi

# Check for hardcoded secrets
if git diff --cached | grep -E '(password|secret|api_key|apikey)\s*=\s*["\'][^"\']+["\']'; then
    echo "❌ Possible hardcoded secret detected!"
    exit 1
fi

# Check file size
for file in $(git diff --cached --name-only); do
    if [ -f "$file" ]; then
        size=$(wc -c < "$file")
        if [ $size -gt 1048576 ]; then # 1MB
            echo "❌ File $file is too large (>1MB)"
            exit 1
        fi
    fi
done

echo "✅ Pre-commit checks passed!"

Hook Types

pre-commit

• Linting (ESLint, Flake8, Pylint)
• Formatting (Prettier, Black, rustfmt)
• Type checking (TypeScript, mypy)
• Unit tests on changed files
• Secret detection

pre-push

• Full test suite
• Build verification
• Coverage check
• Integration tests

commit-msg

• Conventional Commits enforcement
• Ticket number requirement
• Message length validation

post-commit

• Notifications
• Log generation
• Cleanup tasks

Advanced Features

Skip Hooks (When Needed)

# Skip pre-commit
git commit -n -m "Emergency fix"

# Skip pre-push
git push --no-verify

Selective Hooks

# Only run on specific branches
if [ "$(git branch --show-current)" = "main" ]; then
    echo "Running extra checks on main branch..."
fi

Performance Optimization

# Cache linter results
if [ ! -f .lint-cache ] || [ "$(git diff --cached | md5sum)" != "$(cat .lint-cache)" ]; then
    npm run lint
    git diff --cached | md5sum > .lint-cache
fi

Tool Requirements

• Write: Create hook files
• Read: Detect project configuration
• Bash: Make hooks executable

Examples

Example 1: Full Setup

User: "Setup git hooks for my Node.js project"

Output:

• Installs husky + lint-staged
• Creates pre-commit hook (lint, format, test)
• Creates pre-push hook (full tests)
• Creates commit-msg hook (conventional commits)

Example 2: Python Project

User: "Setup pre-commit hooks for Python"

Output:

• Installs pre-commit framework
• Configures black, flake8, isort, mypy
• Adds pytest hook
• Installs hooks to .git/hooks/

Best Practices

1. Fast pre-commit: Only run on changed files
2. Comprehensive pre-push: Full test suite before push
3. Allow skip: Provide --no-verify escape hatch
4. Team consistency: Commit hooks config to repo
5. Clear feedback: Show what's running and why it failed

Changelog

Version 1.0.0

• Husky setup for Node.js
• pre-commit framework for Python
• Manual hooks for any project
• Conventional Commits enforcement
• Secret detection

Author

GLINCKER Team

• Repository: claude-code-marketplace