Merge pull request #177 from arqv/nix

Add Nix derivation

default.nix

@@ -0,0 +1,53 @@
+let
+  zig-overlay = import (
+    builtins.fetchGit {
+      url = "https://github.com/arqv/zig-overlay.git";
+      rev = "a56601116906a2f192702e0b97487b8e7f796fdc";
+    }
+  );
+  pkgs = import <nixpkgs> { overlays = [ zig-overlay ]; };
+
+  gitignoreSrc = pkgs.fetchFromGitHub {
+    owner = "hercules-ci";
+    repo = "gitignore";
+    rev = "c4662e662462e7bf3c2a968483478a665d00e717";
+    sha256 = "1npnx0h6bd0d7ql93ka7azhj40zgjp815fw2r6smg8ch9p7mzdlx";
+  };
+  inherit (import gitignoreSrc { inherit (pkgs) lib; }) gitignoreSource;
+
+  zig-default = pkgs.zig.master;
+in { 
+  zig ? zig-default,
+  extraConfig ? {}
+}:
+
+pkgs.stdenvNoCC.mkDerivation {
+  name = "zls";
+  version = "master";
+  src = gitignoreSource ./.;
+  nativeBuildInputs = [
+    zig
+  ];
+
+  dontConfigure = true;
+  buildPhase = ''
+    zig build -Drelease-safe=true
+  '';
+  installPhase = ''
+    mkdir -p $out
+    zig build install --prefix $out
+
+    cat << EOF > $out/bin/zls.json
+      ${builtins.toJSON {
+        zig_lib_path = "${zig}/lib/zig/";
+        zig_exe_path = "${zig}/bin/zig";
+        warn_style = false;
+        enable_snippets = false;
+        enable_semantic_tokens = false;
+        operator_completions = true;
+      } // extraConfig}
+    EOF
+  '';
+
+  XDG_CACHE_HOME = ".cache";
+}