new version - annotated derivation proposal - used to install addtiontal /src

and /tag/ source code which to build up develop environments more easily ( TODO
make this optional for ghcWrapper )

svn path=/nixpkgs/trunk/; revision=10648

pkgs/development/compilers/ghc/createGhcWrapper/default.nix

@@ -1,9 +1,15 @@
-args: with args;
+args: with args; with lib; with annotatedDerivations;
 
 stdenv.mkDerivation {
   inherit suffix name ghc ;
 
-  buildInputs = libraries ++ [ghcPkgUtil];
+  buildInputs = map delAnnotation (libraries ++ [ghcPkgUtil]);
+  #tags = if (installSourceAndTags == true) then
+  #        map sourceWithTagsDerivation ( uniqList { inputList = 
+  #            ( filterAnnotated ( concatLists (map uniqAnnotatedDeps libraries ) ) ) ; } )
+  #        else [];
+  tags = map (x : sourceWithTagsDerivation (x.sourceWithTags)) 
+          (uniqList { inputList=  filter annotatedWithSourceAndTagInfo libraries; } );
 
   phases="installPhase";
 
@@ -21,5 +27,12 @@ GHC_PACKAGE_PATH=\${GHC_PACKAGE_PATH}\${g} \$ghc/bin/$app \"\\\$@\"
 EOF
       chmod +x \"\$out/bin/\$a$suffix\"
     done
+
+    ensureDir \$out/{src,tags}
+    for i in \$tags; do
+      for path in src tags; do
+        ln -s \$i/\$path/* \$out/\$path
+      done
+    done
 ";
 }