Bits of .NET

⚙️ Run Scripts Automatically on Git Events

Run tests before commit? Lint before push? Format code? Git hooks automate anything. No more forgotten steps.

📝 Available Hooks

.git/hooks/ (create executable files)

Client-side:
- pre-commit        # Run tests before commit (cancel if fails)
- prepare-commit-msg # Edit commit message before editor opens
- commit-msg        # Validate commit message
- post-commit       # Notify after commit
- pre-push          # Run before push (CI checks)
- pre-rebase        # Cancel rebase if conditions not met

Server-side:
- pre-receive       # Before accepting push
- update            # Per-branch check
- post-receive      # After push (deploy, notify)

🎯 pre-commit Example

#!/bin/bash
# .git/hooks/pre-commit

# Run linter
npm run lint
if [ $? -ne 0 ]; then
  echo "❌ Linter failed. Fix errors before commit."
  exit 1
fi

# Run tests (only staged files)
npm test -- --findRelatedTests $(git diff --cached --name-only --diff-filter=ACM | grep '\.js$')
if [ $? -ne 0 ]; then
  echo "❌ Tests failed. Fix before commit."
  exit 1
fi

# Format code
npm run format
git add $(git diff --name-only)  # Stage formatted files

echo "✅ pre-commit checks passed"
exit 0

✅ Tools for Hook Management

• Husky (Node.js): Manage hooks in package.json
• pre-commit (Python): Framework for hooks
• lefthook (Cross-language): Fast, polyglot hooks
• overcommit (Ruby): Extensive hook library