add nix packaging

default.nix

@@ -0,0 +1,18 @@
+{ ... }:
+let
+  sources = import ./nix/sources.nix;
+  nixpkgs = import sources.nixpkgs { };
+  gitignore = import sources.gitignore { };
+in with nixpkgs;
+stdenv.mkDerivation {
+  name = "notes";
+  src = gitignore.gitignoreSource ./.;
+
+  buildInputs = [ elmPackages.elm ninja nodePackages.uglify-js ];
+  buildPhase = ''
+    ./script/ninja.sh > build.ninja
+    env ELM_HOME=.elm ninja
+  '';
+
+  installPhase = "cp -r dist/ $out/";
+}

nix/sources.json

@@ -1,4 +1,16 @@
 {
+    "gitignore": {
+        "branch": "master",
+        "description": "Nix function for filtering local git sources",
+        "homepage": "",
+        "owner": "hercules-ci",
+        "repo": "gitignore",
+        "rev": "00b237fb1813c48e20ee2021deb6f3f03843e9e4",
+        "sha256": "186pvp1y5fid8mm8c7ycjzwzhv7i6s3hh33rbi05ggrs7r3as3yy",
+        "type": "tarball",
+        "url": "https://github.com/hercules-ci/gitignore/archive/00b237fb1813c48e20ee2021deb6f3f03843e9e4.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "niv": {
         "branch": "master",
         "description": "Easy dependency management for Nix projects",