push sheeet

pkgs/development/compilers/elm/lib/default.nix

@@ -0,0 +1,22 @@
+{
+  writeScriptBin,
+  stdenv,
+  lib,
+  elm,
+}:
+let
+  patchNpmElm =
+    pkg:
+    pkg.override (old: {
+      preRebuild = (old.preRebuild or "") + ''
+        rm node_modules/elm/install.js
+        echo "console.log('Nixpkgs\' version of Elm will be used');" > node_modules/elm/install.js
+      '';
+      postInstall = (old.postInstall or "") + ''
+        ln -sf ${elm}/bin/elm node_modules/elm/bin/elm
+      '';
+    });
+in
+{
+  inherit patchNpmElm;
+}

pkgs/development/compilers/elm/lib/fetchElmDeps.nix

@@ -0,0 +1,26 @@
+{
+  stdenv,
+  lib,
+  fetchurl,
+}:
+
+{
+  elmPackages,
+  registryDat,
+  elmVersion,
+}:
+
+let
+  makeDotElm = import ./makeDotElm.nix {
+    inherit
+      stdenv
+      lib
+      fetchurl
+      registryDat
+      ;
+  };
+in
+''
+  export ELM_HOME=`pwd`/.elm
+''
++ (makeDotElm elmVersion elmPackages)

pkgs/development/compilers/elm/lib/makeDotElm.nix

@@ -0,0 +1,42 @@
+{
+  stdenv,
+  lib,
+  fetchurl,
+  registryDat,
+}:
+
+ver: deps:
+let
+  cmds = lib.mapAttrsToList (
+    name: info:
+    let
+      pkg = stdenv.mkDerivation {
+        name = lib.replaceStrings [ "/" ] [ "-" ] name + "-${info.version}";
+
+        src = fetchurl {
+          url = "https://github.com/${name}/archive/${info.version}.tar.gz";
+          meta.homepage = "https://github.com/${name}/";
+          inherit (info) sha256;
+        };
+
+        dontConfigure = true;
+        dontBuild = true;
+
+        installPhase = ''
+          mkdir -p $out
+          cp -r * $out
+        '';
+      };
+    in
+    ''
+      mkdir -p .elm/${ver}/packages/${name}
+      cp -R ${pkg} .elm/${ver}/packages/${name}/${info.version}
+    ''
+  ) deps;
+in
+(lib.concatStrings cmds)
++ ''
+  mkdir -p .elm/${ver}/packages;
+  cp ${registryDat} .elm/${ver}/packages/registry.dat;
+  chmod -R +w .elm
+''