Commit - Git Commit Generator

Analyze staged changes and generate semantic commit messages.

Commands

Workflow

Step 1: Pre-flight Check

# Verify git repository
git rev-parse --is-inside-work-tree

# Check staged changes
git diff --staged --quiet

# Get staged files
git diff --staged --name-only

If no staged changes: Check git status, prompt user to stage changes first.

Step 2: Analyze Staged Changes

git diff --staged
git diff --staged --stat

Analysis Focus:

1. Change Type Detection

   • New files → feat
   • Modified files → Based on content
   • Deleted files → refactor or chore

2. Semantic Type Classification

   • feat: New feature/functionality
   • fix: Bug fix
   • refactor: Code restructuring without behavior change
   • docs: Documentation only
   • style: Formatting, whitespace
   • test: Tests
   • chore: Build, dependencies, tooling
   • perf: Performance improvements
   • ci: CI/CD changes
   • build: Build system changes

3. Scope Identification

   • Extract from file paths: src/auth/login.ts → scope: auth

Step 3: Generate Commit Message

Format:

\x3Ctype>(\x3Cscope>): \x3Csubject>

[optional body]

[optional footer(s)]

Rules:

• Subject in imperative mood: "add" not "added"
• No period at end
• Max 50 characters for subject
• Body wrap at 72 characters
• Footer: BREAKING CHANGE:, Closes #123, Fixes #456

Examples:

feat(auth): add JWT token refresh mechanism

fix(payment): handle duplicate callback correctly

Payment callback was processing duplicates due to missing idempotency
check. Added unique constraint on (order_id, callback_id).

Fixes #234

refactor(db)!: migrate from MySQL to PostgreSQL

BREAKING CHANGE: Database migration required.

Step 4: Execute Commit

# Commit with generated message (author is global git user)
git commit -m "type(scope): subject" [-m "optional body"]

Or use heredoc for multi-line:

git commit -m "$(cat \x3C\x3C'EOF'
type(scope): subject

optional body
EOF
)"

Verify:

git log -1 --oneline
git show HEAD --stat

Best Practices

DO:

• ✅ Analyze ALL staged changes before generating
• ✅ Use imperative mood ("add" not "added")
• ✅ Keep subject under 50 characters
• ✅ Add body for complex changes
• ✅ Reference issues when applicable
• ✅ Group related changes in one commit

DON'T:

• ❌ Commit without staged changes
• ❌ Mix unrelated changes
• ❌ Use past tense
• ❌ End subject with period
• ❌ Include sensitive information
• ❌ Skip pre-commit hooks (unless explicitly requested)

Edge Cases

No Staged Changes

git status
# Prompt: "No staged changes. Would you like to stage all changes?"

Empty Repository (Initial Commit)

git rev-parse HEAD 2>/dev/null || git commit -m "chore: initial commit"

Large Diff (>500 lines)

git diff --staged --stat
git diff --staged --unified=1
# Suggest splitting into multiple commits

Merge Conflicts

git status | grep "both modified"
git commit -m "merge: resolve conflicts in \x3Cfiles>"

Hooks Integration

• pre-commit: Runs automatically
• commit-msg: Runs automatically
• If hooks fail: Report error, suggest fixes
• Bypass with --no-verify only if explicitly requested