phy-pre-commit-gen — Pre-commit Config Generator

Analyzes your project and generates a .pre-commit-config.yaml with the right hooks for your specific stack. No generic templates — actual configuration based on what your project uses.

Quick Start

# Generate config for the current directory
python3 ~/.claude/skills/phy-pre-commit-gen/scripts/pre_commit_gen.py .

# Preview without writing
python3 ~/.claude/skills/phy-pre-commit-gen/scripts/pre_commit_gen.py . --dry-run

# Audit an existing .pre-commit-config.yaml
python3 ~/.claude/skills/phy-pre-commit-gen/scripts/pre_commit_gen.py . --audit

# Overwrite an existing config
python3 ~/.claude/skills/phy-pre-commit-gen/scripts/pre_commit_gen.py . --overwrite

# Write to a specific path
python3 ~/.claude/skills/phy-pre-commit-gen/scripts/pre_commit_gen.py . --output .pre-commit-config.yaml

Then activate:

pip install pre-commit
pre-commit install          # activate for this repo
pre-commit autoupdate       # update all hook revs to latest
pre-commit run --all-files  # run on existing code

What It Detects

Hook Selection Logic

Python:

• Has Ruff config → use ruff + ruff-format (replaces black+isort+flake8)
• Has Black config → use black + isort (if isort configured) + flake8 (if configured)
• Neither → add Ruff as recommended default

JS/TypeScript:

• Has ESLint → use eslint mirror hook
• Has Prettier → use prettier mirror hook
• Neither → add Prettier as baseline

Always included:

• pre-commit-hooks — trailing whitespace, EOF fixer, YAML/JSON/TOML check, large files, merge conflict detection, no-commit-to-branch (main/master)
• detect-secrets — secret baseline scanning
• markdownlint-cli — Markdown quality

Conditionally included:

• Go → go-fmt, go-vet, go-unit-tests
• Rust → rustfmt (local), clippy (local)
• Terraform → terraform_fmt, terraform_validate, terraform_tflint
• Docker → hadolint (Dockerfile security)
• Shell → shellcheck
• SQL → sqlfluff
• YAML CI present → yamllint
• Commitizen/commitlint detected → commitizen (commit-msg stage)

Audit Mode

Checks an existing .pre-commit-config.yaml for:

• Unpinned revs (latest, main, HEAD) — can break unexpectedly
• No secret detection hook (detect-secrets or gitleaks)
• Missing trailing-whitespace hook
• Local hooks that may not work cross-platform

python3 ~/.claude/skills/phy-pre-commit-gen/scripts/pre_commit_gen.py . --audit

Output:

📋  Auditing: .pre-commit-config.yaml

  🔴 Unpinned rev 'main' — pre-commit hooks should be pinned to a specific tag
  🟠 No secret detection hook — add detect-secrets or gitleaks
  ✅ trailing-whitespace present

Example Outputs

Python + Ruff project

# Generated by phy-pre-commit-gen
# Run: pre-commit install && pre-commit autoupdate

repos:

  # Universal quality checks
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.6.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
      - id: check-yaml
      - id: check-json
      - id: check-toml
      - id: check-merge-conflict
      - id: check-added-large-files
        args: [--maxkb=1000]
      - id: mixed-line-ending
      - id: no-commit-to-branch
        args: [--branch, main, --branch, master]

  # Secret detection
  - repo: https://github.com/Yelp/detect-secrets
    rev: v1.5.0
    hooks:
      - id: detect-secrets
        args: [--baseline, .secrets.baseline]

  # Python — Ruff (linter + formatter)
  - repo: https://github.com/astral-sh/ruff-pre-commit
    rev: v0.4.7
    hooks:
      - id: ruff
        args: [--fix]
      - id: ruff-format

  # Markdown
  - repo: https://github.com/igorshubovych/markdownlint-cli
    rev: v0.41.0
    hooks:
      - id: markdownlint

Full-stack polyglot (JS + Python + Terraform + Docker)

# Generated by phy-pre-commit-gen

repos:

  # Universal
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.6.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
      ... (+ 6 more)

  # Secret detection
  - repo: https://github.com/Yelp/detect-secrets
    rev: v1.5.0
    hooks:
      - id: detect-secrets

  # Python — Ruff
  - repo: https://github.com/astral-sh/ruff-pre-commit
    rev: v0.4.7
    hooks:
      - id: ruff
        args: [--fix]
      - id: ruff-format

  # JS/TS — ESLint
  - repo: https://github.com/pre-commit/mirrors-eslint
    rev: v9.7.0
    hooks:
      - id: eslint

  # JS/TS — Prettier
  - repo: https://github.com/pre-commit/mirrors-prettier
    rev: v3.3.2
    hooks:
      - id: prettier

  # Terraform
  - repo: https://github.com/antonbabenko/pre-commit-terraform
    rev: v1.92.1
    hooks:
      - id: terraform_fmt
      - id: terraform_validate
      - id: terraform_tflint

  # Dockerfile security
  - repo: https://github.com/hadolint/hadolint
    rev: v2.13.0-beta
    hooks:
      - id: hadolint-docker

  # Shell
  - repo: https://github.com/shellcheck-py/shellcheck-py
    rev: v0.10.0.1
    hooks:
      - id: shellcheck

  # YAML
  - repo: https://github.com/adrienverge/yamllint
    rev: v1.35.1
    hooks:
      - id: yamllint
        args: [-d, relaxed]

  # Markdown
  - repo: https://github.com/igorshubovych/markdownlint-cli
    rev: v0.41.0
    hooks:
      - id: markdownlint

Hook Revisions

All revisions are pinned to stable releases as of early 2026. Always run pre-commit autoupdate after generating to get the latest pinned versions:

pre-commit autoupdate
git add .pre-commit-config.yaml
git commit -m "chore: update pre-commit hook revisions"

Integration with CI

# GitHub Actions — run pre-commit on all files
- uses: pre-commit/action@v3.0.1
  with:
    extra_args: --all-files

# Or manual:
- name: pre-commit
  run: |
    pip install pre-commit
    pre-commit run --all-files

Technical Notes

• Zero external dependencies — pure Python 3.7+ stdlib
• Duplicate detection — reads existing .pre-commit-config.yaml to avoid adding already-present hooks
• Idempotent — running on a project with existing config uses --overwrite flag; safe default is to not overwrite
• YAML output — valid YAML, human-readable comments, standard pre-commit format

Companion Skills

Author

Canlah AI — Run performance marketing without breaking your brand.

• GitHub: github.com/PHY041
• All Skills: clawhub.ai/PHY041