From 3bf0d2b9608b6c2da2996b601783f30afd8e6765 Mon Sep 17 00:00:00 2001
From: Patrick John Wheeler <Patrick.John.Wheeler@gmail.com>
Date: Wed, 17 Apr 2013 00:06:10 +0200
Subject: [PATCH] ghc-wrapper: install the GHC documentation into the user's
 profile

The freaky implementation was done that way in order to avoid unnecessary
re-builds of all Haskell packages by changing the wrapper script used
internally in those builds.

See <https://github.com/NixOS/nixpkgs/pull/466> for further details.
---
 pkgs/development/compilers/ghc/wrapper.nix | 11 +++++++++--
 pkgs/top-level/haskell-packages.nix        | 10 ++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/compilers/ghc/wrapper.nix b/pkgs/development/compilers/ghc/wrapper.nix
index bc28fdc91319..55fd16be5edb 100644
--- a/pkgs/development/compilers/ghc/wrapper.nix
+++ b/pkgs/development/compilers/ghc/wrapper.nix
@@ -1,4 +1,4 @@
-{ stdenv, ghc, makeWrapper, coreutils }:
+{ stdenv, ghc, makeWrapper, coreutils, forUserEnv ? false }:
 
 let
   ghc761OrLater = !stdenv.lib.versionOlder ghc.version "7.6.1";
@@ -54,4 +54,11 @@ stdenv.mkDerivation ({
   inherit ghc;
   inherit (ghc) meta;
   ghcVersion = ghc.version;
-} // (stdenv.lib.optionalAttrs ghc761OrLater { preFixup = "sed -i -e 's|-package-conf|${packageDBFlag}|' $out/bin/ghc-get-packages.sh"; }))
+} // (stdenv.lib.optionalAttrs ghc761OrLater { preFixup = "sed -i -e 's|-package-conf|${packageDBFlag}|' $out/bin/ghc-get-packages.sh"; })
+  // (stdenv.lib.optionalAttrs forUserEnv {
+       postFixup= ''
+         ln -s $ghc/lib $out/lib;
+         mkdir -p $out/share/doc
+         ln -s $ghc/share/doc/ghc $out/share/doc/ghc-${ghc.version}
+       '';
+     }))
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 7c6c237b194b..3bf5d3d7f749 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -89,6 +89,16 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
     ghc = ghc; # refers to ghcPlain
   };
 
+  # The normal GHC wrapper doesn't create links to the documentation in
+  # ~/.nix-profile. Having this second wrapper allows us to remedy the
+  # situation without re-building all Haskell packages. At the next
+  # stdenv-updates merge, this second wrapper will go away.
+
+  ghcUserEnvWrapper = pkgs.appendToName "new" (callPackage ../development/compilers/ghc/wrapper.nix {
+    ghc = ghc; # refers to ghcPlain
+    forUserEnv = true;
+  });
+
   # An experimental wrapper around ghcPlain that does not automatically
   # pick up packages from the profile, but instead has a fixed set of packages
   # in its global database. The set of packages can be specified as an