haskell-packages: bring hoogle to the masses by imlementing ghcWithHoogle

Replace `ghcWithPackages` to `ghcWithHoogle` in your config and enjoy.

pkgs/development/haskell-modules/default.nix

@@ -47,18 +47,29 @@ let
       defaultScope = mkScope self;
       callPackage = drv: args: callPackageWithScope defaultScope drv args;
 
+      withPackages = packages: callPackage ./with-packages-wrapper.nix {
+        inherit (self) llvmPackages;
+        haskellPackages = self;
+        inherit packages;
+      };
+
     in
       import ./hackage-packages.nix { inherit pkgs stdenv callPackage; } self // {
 
         inherit mkDerivation callPackage;
 
-        ghcWithPackages = pkgs: callPackage ./with-packages-wrapper.nix {
+        ghcWithPackages = selectFrom: withPackages (selectFrom self);
-          inherit (self) llvmPackages;
-          haskellPackages = self;
-          packages = pkgs self;
-        };
 
-        ghc = ghc // { withPackages = self.ghcWithPackages; };
+        ghcWithHoogle = selectFrom:
+          let
+            packages = selectFrom self;
+            hoogle = callPackage ./hoogle.nix { inherit packages; };
+          in withPackages (packages ++ [ hoogle ]);
+
+        ghc = ghc // {
+          withPackages = self.ghcWithPackages;
+          withHoogle = self.ghcWithHoogle;
+        };
 
       };
 

pkgs/development/haskell-modules/hoogle.nix

@@ -98,6 +98,10 @@ stdenv.mkDerivation {
     chmod +x $out/bin/hoogle
   '';
 
+  passthru = {
+    isHaskellLibrary = false; # for the filter in ./with-packages-wrapper.nix
+  };
+
   meta = {
     description = "A local Hoogle database";
     platforms = ghc.meta.platforms;