modified improved hasktags (can be removed when my changes are merged into ghc)

improved ghcs expression file Now you have tags for all libraries.
I still have to work on speed

svn path=/nixpkgs/trunk/; revision=10657

pkgs/development/tools/misc/hasktags/default.nix

@@ -0,0 +1,24 @@
+args:
+args.stdenv.mkDerivation {
+  name = "hasktags-modified";
+
+  src = args.fetchurl {
+    url = http://mawercer.de/hasktags.hs;
+    sha256 = "112k97g6mgvwa0a9zrq840mqxxw55cn422h1c134xb0fl29llig7";
+  };
+
+  buildInputs =(with args; [ghc]);
+
+  phases = "buildPhase";
+
+  # calling it hasktags-modified to not clash with the one distributed with ghc
+  buildPhase = "
+    ensureDir \$out/bin
+    ghc --make \$src -o \$out/bin/hasktags-modified
+  ";
+
+  meta = { 
+      # this can be removed again when somone comitts my changes into the distribution
+      description = "Marc's modified hasktags";
+  };
+}