Added Nix derivation.

default.nix

@@ -0,0 +1,51 @@
+let
+  sources = import ./nix/sources.nix;
+  pkgs = import sources.nixpkgs {};
+  gitignore = import sources.gitignore {};
+  
+  zig = pkgs.stdenvNoCC.mkDerivation rec {
+    name = "zig";
+    version = "0.6.0+91a1c20e7";
+    src = pkgs.fetchurl {
+      url = "https://ziglang.org/builds/zig-linux-x86_64-${version}.tar.xz";
+      sha256 = "7d715ea8948611734986d8a056fdec98d0f39b064e38efcd088823c02b1afba8";
+    };
+    dontConfigure = true;
+    dontBuild = true;
+    installPhase = ''
+      mkdir -p $out $out/bin $out/doc
+      mv lib/ $out/
+      mv zig $out/bin
+      mv langref.html $out/doc
+    '';
+  };
+in
+  pkgs.stdenvNoCC.mkDerivation {
+    name = "zls";
+    version = "master";
+    src = gitignore.gitignoreSource ./.;
+    nativeBuildInputs = [ zig ];
+    dontConfigure = true;
+    
+    buildPhase = ''
+      zig build -Drelease-safe=true
+    '';
+    installPhase = ''
+      mkdir -p $out
+      zig build install --prefix $out
+
+      # write configuration according to defaults described in README.md
+      cat << EOF > $out/bin/zls.json
+        {
+          "zig_lib_path": "${zig}/lib/zig/",
+          "zig_exe_path": "${zig}/bin/zig",
+          "warn_style": false,
+          "enable_snippets": false,
+          "enable_semantic_tokens": false,
+          "operator_completions": true
+        }
+      EOF
+    '';
+
+    XDG_CACHE_HOME = ".";
+  }