Git Log - Commit & Documentation

Generate structured commit messages and maintain comprehensive git log documentation for the VRP toolkit project.

When to Use

Use this skill when:

• Preparing to commit changes to the repository
• Reviewing git history to understand recent changes
• Maintaining the project's change documentation
• Need quick reference for common git commands
• Want to ensure consistent commit message formatting

Core Workflow: Commit & Log

Step 1: Analyze Changes

Before committing, analyze the current changes:

git status
git diff --staged  # If changes already staged
git diff           # If changes not staged

Key questions to answer:

• What files were modified/added/deleted?
• What is the nature of changes (feature, bug fix, docs, refactor)?
• What scope is affected (e.g., architecture, setup, migration)?

Step 2: Generate Commit Message

Based on the changes, generate a commit message following Conventional Commits format:

Format: <type>(<scope>): <subject>

Common types for this project:

• feat: New feature or functionality
• fix: Bug fix
• docs: Documentation changes
• refactor: Code refactoring (no behavior change)
• test: Adding or updating tests
• chore: Maintenance tasks, dependency updates
• style: Code style changes (formatting, etc.)

Common scopes for this project:

• architecture: Changes to overall architecture
• migration: File migrations from SDR_stochastic
• setup: Project setup, installation, dependencies
• alns: ALNS algorithm changes
• pdptw: PDPTW problem definition
• data: Data layer changes
• visualization: Visualization tools
• tutorials: Tutorial notebooks

Subject guidelines:

• Use imperative mood: "add" not "added" or "adds"
• First letter lowercase
• No period at end
• Keep under 50 characters if possible

Body (optional but recommended):

• Explain what changed and why
• Use bullet points for multiple changes
• Reference issues or related work

Examples:

feat(architecture): implement unified Solver interface for problem-algorithm separation

- Create VRPProblem, VRPSolution, Solver abstract base classes
- Implement ALNSSolver adapter pattern
- Update quickstart tutorial to demonstrate new interface

chore: update migration progress (9/9 files)

- Update CLAUDE.md completed tasks section
- Add migration entry to MIGRATION_LOG.md
- Update progress statistics

Step 3: Maintain Git Log Documentation

After committing, update the git log documentation file (.claude/GIT_LOG.md):

File structure:

# Git Log - VRP Toolkit Project

*Comprehensive record of all commits with detailed information.*

## Recent Commits (newest first)

### 2026-01-01 - feat(architecture): implement unified Solver interface
**Hash:** 4569fa1
**Author:** [Author Name]
**Date:** 2026-01-01 12:34:56

**Changes:**
- Created base.py module with abstract base classes
- Implemented adapter pattern for backward compatibility
- Updated quickstart tutorial

**Files modified:**
- vrp_toolkit/algorithms/base.py
- vrp_toolkit/algorithms/alns/solver.py
- tutorials/01_quickstart.ipynb

---

### 2025-12-31 - chore: update migration progress (9/9)
**Hash:** 9590014
**Author:** [Author Name]
**Date:** 2025-12-31 10:20:30

**Changes:**
- Updated CLAUDE.md with completed migration status
- Added final migration entry to MIGRATION_LOG.md

**Files modified:**
- .claude/CLAUDE.md
- .claude/MIGRATION_LOG.md

Update process:

1. Extract commit information: git log -1 --pretty=format:"%H|%an|%ad|%s" --date=iso
2. Get changed files: git show --name-only --pretty=format:"" HEAD
3. Format entry using template above
4. Add to top of "Recent Commits" section in .claude/GIT_LOG.md
5. Keep only last 20-30 commits in main section (archive older ones if needed)

Step 4: Execute Commit

Provide the user with exact commands to execute:

# Stage changes
git add [file1] [file2] ...

# Commit with generated message
git commit -m "feat(architecture): implement unified Solver interface

- Create VRPProblem, VRPSolution, Solver abstract base classes
- Implement ALNSSolver adapter pattern
- Update quickstart tutorial to demonstrate new interface"

# Push to remote (if desired)
git push

Quick Command Reference

Status & Diff

git status -s          # Short status
git diff               # Unstaged changes
git diff --staged      # Staged changes
git diff HEAD~1        # Compare with previous commit

Commit Operations

git commit -am "msg"   # Stage tracked files and commit
git commit --amend     # Amend last commit
git commit --amend --no-edit  # Amend without changing message

Branch Operations

git checkout -b feature-name  # Create and switch branch
git switch -c feature-name    # Modern equivalent
git branch -d branch-name     # Delete local branch

History & Log

git log --oneline -10         # Last 10 commits, one line
git log --oneline --graph --all  # Graphical history
git show HEAD                 # Show last commit details

Undo & Reset

git restore --staged file.py  # Unstage file
git restore file.py           # Discard unstaged changes
git reset --soft HEAD~1       # Undo commit, keep changes

Integration with Other Skills

update-progress: After updating CLAUDE.md and MIGRATION_LOG.md, use git-workflow to commit the documentation updates.

migrate-module: After migrating files, use git-workflow to commit the migrated code.

build-session-context: Read GIT_LOG.md to understand recent changes when starting a session.

update-task-board: Use GIT_LOG.md to track completion of development tasks.

Project-Specific Patterns

Migration Commits

git add vrp_toolkit/problems/pdptw.py
git commit -m "feat(migration): migrate instance.py to pdptw.py

- Extract generic Instance class
- Add type hints and docstrings
- Create basic test suite"

Progress Update Commits

git add .claude/CLAUDE.md .claude/MIGRATION_LOG.md
git commit -m "chore: update migration progress (5/9 files)

- Mark instance.py migration as completed
- Update progress statistics
- Add detailed migration entry"

Tutorial/Example Commits

git add tutorials/01_quickstart.ipynb
git commit -m "docs: add quickstart tutorial

- Show basic instance creation
- Demonstrate ALNS solving
- Include visualization examples"

GIT_LOG.md Maintenance

Initial Setup

If .claude/GIT_LOG.md doesn't exist, create it with the structure above.

Regular Updates

After each commit, update GIT_LOG.md with the new commit information.

Archive Strategy

• Keep last 20 commits in "Recent Commits" section
• Move older commits to "Archive" section at bottom
• Consider monthly archives if volume is high

Automation Notes

When AI uses this skill, it should:

1. Analyze current git changes
2. Generate appropriate commit message
3. Show user exact commands to execute
4. After commit, update GIT_LOG.md with new entry
5. Keep GIT_LOG.md organized and readable

Troubleshooting

Empty Commit Message

If commit message seems generic, ask:

• What specific functionality was added/fixed?
• Which files were most significantly changed?
• What problem does this change solve?

Multiple Change Types

If changes include mixed types (e.g., feat and fix):

• Create separate commits if possible
• If must combine, use most significant type and explain in body

Missing GIT_LOG.md

If file doesn't exist, create it with current commit history:

# Get last 20 commits for initial log
git log --oneline -20