build playground with nix

.gitignore

@@ -1,2 +1,3 @@
+/result
 elm-stuff
 index.html

Makefile

@@ -0,0 +1,6 @@
+nix/elm-srcs.nix: playground/elm.json
+	cd playground && elm2nix convert > ../$@
+
+nix/registry.dat: playground/elm.json
+	cd playground && elm2nix snapshot
+	mv playground/registry.dat $@

default.nix

@@ -0,0 +1,29 @@
+{ ... }:
+let
+  sources = import ./nix/sources.nix;
+  nixpkgs = import sources.nixpkgs { };
+  gitignore = import sources.gitignore { };
+in with nixpkgs;
+stdenv.mkDerivation {
+  name = "datalog";
+  src = gitignore.gitignoreSource ./.;
+
+  buildInputs = [ elmPackages.elm elmPackages.elm-test ];
+  buildPhase = pkgs.elmPackages.fetchElmDeps {
+    elmPackages = import ./nix/elm-srcs.nix;
+    elmVersion = "0.19.1";
+    registryDat = ./nix/registry.dat;
+  };
+
+  doCheck = true;
+  checkPhase = ''
+    env ELM_HOME=.elm elm-test
+  '';
+
+  installPhase = ''
+    mkdir -p $out/share/datalog
+    cd playground
+    elm make --optimize --output $out/share/datalog/index.html src/Main.elm
+  '';
+}
+

nix/elm-srcs.nix

@@ -0,0 +1,52 @@
+{
+
+      "elm/html" = {
+        sha256 = "1n3gpzmpqqdsldys4ipgyl1zacn0kbpc3g4v3hdpiyfjlgh8bf3k";
+        version = "1.0.0";
+      };
+
+      "elm/parser" = {
+        sha256 = "0a3cxrvbm7mwg9ykynhp7vjid58zsw03r63qxipxp3z09qks7512";
+        version = "1.1.0";
+      };
+
+      "elm/browser" = {
+        sha256 = "0nagb9ajacxbbg985r4k9h0jadqpp0gp84nm94kcgbr5sf8i9x13";
+        version = "1.0.2";
+      };
+
+      "rtfeldman/elm-css" = {
+        sha256 = "0nxiyxyw3kw55whkpwhrcgc0dr6a8zlm2nqvsaqdw6mzkykg0ba6";
+        version = "16.1.0";
+      };
+
+      "elm/core" = {
+        sha256 = "19w0iisdd66ywjayyga4kv2p1v9rxzqjaxhckp8ni6n8i0fb2dvf";
+        version = "1.0.5";
+      };
+
+      "elm/json" = {
+        sha256 = "0kjwrz195z84kwywaxhhlnpl3p251qlbm5iz6byd6jky2crmyqyh";
+        version = "1.1.3";
+      };
+
+      "rtfeldman/elm-hex" = {
+        sha256 = "1y0aa16asvwdqmgbskh5iba6psp43lkcjjw9mgzj3gsrg33lp00d";
+        version = "1.0.0";
+      };
+
+      "elm/url" = {
+        sha256 = "0av8x5syid40sgpl5vd7pry2rq0q4pga28b4yykn9gd9v12rs3l4";
+        version = "1.0.0";
+      };
+
+      "elm/time" = {
+        sha256 = "0vch7i86vn0x8b850w1p69vplll1bnbkp8s383z7pinyg94cm2z1";
+        version = "1.0.0";
+      };
+
+      "elm/virtual-dom" = {
+        sha256 = "0q1v5gi4g336bzz1lgwpn5b1639lrn63d8y6k6pimcyismp2i1yg";
+        version = "1.0.2";
+      };
+}

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": "c4662e662462e7bf3c2a968483478a665d00e717",
+        "sha256": "1npnx0h6bd0d7ql93ka7azhj40zgjp815fw2r6smg8ch9p7mzdlx",
+        "type": "tarball",
+        "url": "https://github.com/hercules-ci/gitignore/archive/c4662e662462e7bf3c2a968483478a665d00e717.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "niv": {
         "branch": "master",
         "description": "Easy dependency management for Nix projects",

shell.nix

@@ -11,10 +11,12 @@ stdenv.mkDerivation {
   buildInputs = [
     niv.niv
     git
+    gnumake
 
     # elm
     elmPackages.elm
     elmPackages.elm-format
     elmPackages.elm-test
+    elm2nix
   ];
 }