build: Nix package

.gitignore

@@ -1,7 +1,8 @@
-# Devenv
+# Devenv/Nix
 .devenv*
 devenv.local.nix
 devenv.local.yaml
+/result
 
 # direnv
 .direnv

default.nix

@@ -0,0 +1,38 @@
+{ 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;
+  };
+}