MCP Code Analysis Server

# Nix-based Pre-commit Hooks This project now uses a Nix-based pre-commit solution that works correctly on NixOS, including full support for Ruff and all other Python tools. ## Why Nix-based Pre-commit? Traditional pre-commit hooks install tools via pip in isolated environments. On NixOS, this causes issues because: - Binary tools like Ruff expect system libraries in standard locations (/usr/lib) - NixOS stores libraries in /nix/store with unique paths - The dynamic linker can't find required libraries without Nix's environment setup Our Nix-based solution ensures all tools are properly linked and work correctly on NixOS. ## Features The `nix-pre-commit` script runs the following checks: - **Black** - Python code formatting - **isort** - Import sorting - **Ruff** - Fast Python linting (now works on NixOS!) - **Bandit** - Security vulnerability scanning ## Usage ### Enter the Nix development shell ```bash nix develop ``` ### Run checks manually ```bash # Check staged files (default) nix-pre-commit # Check all files nix-pre-commit --all-files ``` ### Install as a Git hook ```bash # Create the pre-commit hook echo '#!/bin/sh' > .git/hooks/pre-commit echo 'exec nix develop --command nix-pre-commit' >> .git/hooks/pre-commit chmod +x .git/hooks/pre-commit ``` ## Migrating from pip-based pre-commit If you were using the traditional pre-commit setup: 1. Uninstall old hooks: ```bash pre-commit uninstall ``` 2. Clean up: ```bash rm -rf ~/.cache/pre-commit ``` 3. Use the new Nix-based hooks as described above ## Benefits 1. **Full NixOS compatibility** - All tools work correctly, including Ruff 2. **Reproducible** - Same tool versions for everyone using the flake 3. **Fast** - No need to create isolated virtualenvs for each tool 4. **Simple** - Just one script that uses the project's development environment ## Customization To modify the checks, edit the `nixPreCommit` definition in `flake.nix`. The script is a simple bash script that runs each tool and reports results.