{ pkgs ? import <nixpkgs> {} }:

pkgs.stdenv.mkDerivation {
  pname = "gulie";
  version = "0.1.0";

  src = ./.;

  nativeBuildInputs = [ pkgs.makeWrapper ];
  buildInputs = [ pkgs.guile ];

  dontBuild = true;

  installPhase = ''
    runHook preInstall

    # Install Guile source modules
    install -d $out/share/guile/site/3.0
    cp -r gulie $out/share/guile/site/3.0/

    # Install binary, patching the shebang to use the Nix store guile
    install -D -m 755 bin/gulie $out/bin/gulie
    substituteInPlace $out/bin/gulie \
      --replace-fail '#!/usr/bin/env -S guile' '#!${pkgs.guile}/bin/guile'

    # Wrap so GUILE_LOAD_PATH is set at runtime — modules live under site/3.0
    wrapProgram $out/bin/gulie \
      --set GUILE_LOAD_PATH "$out/share/guile/site/3.0"

    runHook postInstall
  '';

  meta = with pkgs.lib; {
    description = "Linter and formatter for Guile Scheme";
    mainProgram = "gulie";
    platforms = platforms.unix;
  };
}