nodePackages: add support for recursive dependencies

This is a drop-in replacement that handles nodejs recursive dependencies by
propagating already visited nodejs packages and creating shims for recursive
ones. This implementation handles both, new and old npm2nix output format.

pkgs/development/web/nodejs/build-node-package.nix

@@ -1,6 +1,6 @@
 { stdenv, runCommand, nodejs, neededNatives}:
 
-args @ { name, src, deps ? [], peerDependencies ? [], flags ? [], preShellHook ? "",  postShellHook ? "", ... }:
+args @ { name, src, deps ? {}, peerDependencies ? [], flags ? [], preShellHook ? "",  postShellHook ? "", resolvedDeps ? {}, bin ? null, ... }:
 
 with stdenv.lib;
 
@@ -12,12 +12,30 @@ let
     mv *node* $out
   '';
 
+  # Convert deps to attribute set
+  attrDeps = if isAttrs deps then deps else
+    (listToAttrs (map (dep: nameValuePair dep.name dep) deps));
+
+  # All required node modules, without already resolved dependencies
+  requiredDeps = removeAttrs attrDeps (attrNames resolvedDeps);
+
+  # Recursive dependencies that we want to avoid with shim creation
+  recursiveDeps = removeAttrs attrDeps (attrNames requiredDeps);
+
   peerDeps = listToAttrs (concatMap (dep: map (name: {
     inherit name;
     value = dep;
   }) (filter (nm: !(elem nm (args.passthru.names or []))) dep.names)) (peerDependencies));
-in
+
-stdenv.mkDerivation ({
+  self = let
+    # Pass resolved dependencies to dependencies of this package 
+    deps = map (
+      dep: dep.override {
+        resolvedDeps = resolvedDeps // { "${name}" = self; };
+      }
+    ) (attrValues requiredDeps);
+
+  in stdenv.mkDerivation ({
     unpackPhase = "true";
 
     inherit src;
@@ -25,12 +43,28 @@ stdenv.mkDerivation ({
     configurePhase = ''
       runHook preConfigure
       mkdir node_modules
+
+      # Symlink dependencies for node modules
       ${concatStrings (concatMap (dep: map (name: ''
         ln -sv ${dep}/lib/node_modules/${name} node_modules/
       '') dep.names) deps)}
+
+      # Symlink peer dependencies
       ${concatStrings (mapAttrsToList (name: dep: ''
         ln -sv ${dep}/lib/node_modules/${name} node_modules/
       '') peerDeps)}
+
+      # Create shims for recursive dependenceies
+      ${concatStrings (concatMap (dep: map (name: ''
+        mkdir -p node_modules/${name}
+        cat > node_modules/${name}/package.json <<EOF
+        {
+            "name": "${name}",
+            "version": "${(builtins.parseDrvName dep.name).version}"
+        }
+        EOF
+      '') dep.names) (attrValues recursiveDeps))}
+
       export HOME=$(pwd)
       runHook postConfigure
     '';
@@ -43,6 +77,13 @@ stdenv.mkDerivation ({
 
     installPhase = ''
       runHook preInstall
+
+      # Remove shims
+      ${concatStrings (concatMap (dep: map (name: ''
+        rm  node_modules/${name}/package.json
+        rmdir node_modules/${name}
+      '') dep.names) (attrValues recursiveDeps))}
+
       mkdir -p $out/lib/node_modules
       ${concatStrings (map (name: ''
         mv node_modules/${name} $out/lib/node_modules
@@ -90,10 +131,16 @@ stdenv.mkDerivation ({
       '') dep.names) deps)}
       ${postShellHook}
     '';
-} // args // {
+  } // (filterAttrs (n: v: n != "deps" && n != "resolvedDeps") args) // {
+    name = "${
+      if bin == true then "bin-" else if bin == false then "node-" else ""
+    }${name}";
+
     # Run the node setup hook when this package is a build input
     propagatedNativeBuildInputs = (args.propagatedNativeBuildInputs or []) ++ [ nodejs ];
 
     # Make buildNodePackage useful with --run-env
     nativeBuildInputs = (args.nativeBuildInputs or []) ++ deps ++ peerDependencies ++ neededNatives;
-} )
+  });
+
+in self