Major Haskell packages overhaul.

Several changes, some highlights:

  * Structure of haskell-packages.nix updated. It's now easier to
    select different default versions of packages for different
    versions of GHC.

  * GHC 7.0.2 is now default.

  * Haskell Platform 2011.2.0.0 has been added and is now default.

  * Several packages have been updated
    (gtk2hs, gitit, xmonad, darcs, ...).

  * Some old packages have been removed.

svn path=/nixpkgs/trunk/; revision=26288

pkgs/development/tools/documentation/haddock/2.9.2.nix

@@ -0,0 +1,18 @@
+{cabal, ghcPaths, xhtml, alex, happy, makeWrapper}:
+
+cabal.mkDerivation (self : {
+  pname = "haddock";
+  version = "2.9.2"; # Haskell Platform 2011.2.0.0
+  name = self.fname;
+  sha256 = "189vvp173pqc69zgzqqx6vyhvsc13p1s86ql60rs1j5qlhh8ajg8";
+  extraBuildInputs = [alex happy makeWrapper];
+  propagatedBuildInputs = [ghcPaths xhtml];
+
+  postInstall = ''
+   wrapProgram $out/bin/haddock --add-flags "\$(${self.ghc.GHCGetPackages} ${self.ghc.ghcVersion} \"\$(dirname \$0)\" \"--optghc=-package-conf --optghc=\")"
+  '';
+
+  meta = {
+    description = "a tool for automatically generating documentation from annotated Haskell source code";
+  };
+})