treefmt.nix

{
  # treefmt configuration
  # Reference: https://github.com/numtide/treefmt-nix
  # Formats multiple file types with a single command
  # Usage: treefmt (or nix run .#treefmt)
  projectRootFile = "flake.nix";
  programs = {
    # Nix formatters
    nixfmt.enable = true; # Official Nix formatter (RFC-style is now default)
    deadnix.enable = true; # Find unused Nix code

    # Shell script formatters
    shfmt.enable = true;
    # Note: shellcheck is a linter, not a formatter - run separately if needed

    # Python formatters
    ruff-format.enable = true;
    ruff-check.enable = true;

    # YAML formatter
    yamlfmt.enable = true;

    # Multi-language formatter
    prettier.enable = true; # JS/TS/JSON/CSS/HTML/etc

    # GitHub Actions linter
    actionlint.enable = true;
  };
}