fusiongalaxy / lefthook

Fast and powerful Git hooks manager for any type of projects.

Lefthook

The fastest polyglot Git hooks manager out there

Fast and powerful Git hooks manager for Node.js, Ruby or any other type of projects.

• Fast. It is written in Go. Can run commands in parallel.
• Powerful. With a few lines in the config you can check only the changed files on pre-push hook.
• Simple. It is single dependency-free binary which can work in any environment.

📖 Read the introduction post

# On `git push` lefthook will run spelling and links check for all of the changed files
pre-push:
  parallel: true
  commands:
    spelling:
      files: git diff --name-only HEAD @{push}
      glob: "*.md"
      run: npx yaspeller {files}
    check-links:
      files: git diff --name-only HEAD @{push}
      glob: "*.md"
      run: npx markdown-link-check {files}

Usage

Choose your environment:

• Node.js
• Ruby
• Other environments

Then you can find all Lefthook features in the full guide and explore wiki.

---

Why Lefthook

• Parallel execution

If you want more speed. Example

pre-push:
  parallel: true

• Flexible list of files

If you want your own list. Custom and prebuilt examples.

pre-commit:
  commands:
    frontend-linter:
      run: yarn eslint {staged_files}
    backend-linter:
      run: bundle exec rubocop --force-exclusion {all_files}
    frontend-style:
      files: git diff --name-only HEAD @{push}
      run: yarn stylelint {files}

• Glob and regexp filters

If you want to filter list of files. You could find more glob pattern examples here.

pre-commit:
  commands:
    backend-linter:
      glob: "*.rb" # glob filter
      exclude: "application.rb|routes.rb" # regexp filter
      run: bundle exec rubocop --force-exclusion {all_files}

• Execute in sub-directory

If you want to execute the commands in a relative path

pre-commit:
  commands:
    backend-linter:
      root: "api/" # Careful to have only trailing slash
      glob: "*.rb" # glob filter
      run: bundle exec rubocop {all_files}

• Run scripts

If oneline commands are not enough, you can execute files. Example.

commit-msg:
  scripts:
    "template_checker":
      runner: bash

• Tags

If you want to control a group of commands. Example.

pre-push:
  commands:
    packages-audit:
      tags: frontend security
      run: yarn audit
    gems-audit:
      tags: backend security
      run: bundle audit

• Support Docker

If you are in the Docker environment. Example.

pre-commit:
  scripts:
    "good_job.js":
      runner: docker run -it --rm <container_id_or_name> {cmd}

• Local config

If you a frontend/backend developer and want to skip unnecessary commands or override something into Docker. Description.

# lefthook-local.yml
pre-push:
  exclude_tags:
    - frontend
  commands:
    packages-audit:
      skip: true

• Direct control

If you want to run hooks group directly.

$ lefthook run pre-commit

• Your own tasks

If you want to run specific group of commands directly.

fixer:
  commands:
    ruby-fixer:
      run: bundle exec rubocop --force-exclusion --safe-auto-correct {staged_files}
    js-fixer:
      run: yarn eslint --fix {staged_files}

$ lefthook run fixer

• Optional output

If you don't want to see supporting information:

skip_output:
  - meta #(version and which hook running)
  - success #(output from runners with exit code 0)

---

Table of contents:

Guides

• Node.js
• Ruby
• Other environments
• Full features guide
• Troubleshooting

Migrate from

• Husky
• Husky and lint-staged
• Overcommit

Examples

• Simple script
• Full features

Benchmarks

• vs Overcommit
• vs pre-commit

Comparison list

• vs Overcommit, Husky, pre-commit

Articles

• Lefthook: Knock your team’s code back into shape
• Lefthook + Crystalball
• Keeping OSS documentation in check with docsify, Lefthook, and friends
• Automatically linting docker containers
• Smooth PostgreSQL upgrades in DockerDev environments with Lefthook
• Lefthook for React/React Native apps