Adding a KDE wrapper, to easily have KDE programs in nix-env.

Specially for those not running KDE.

pkgs/build-support/kdewrapper/default.nix

@@ -0,0 +1,40 @@
+{ stdenv, kde4, shared_mime_info, extraLibs ? [] }:
+
+/* Supply a KDE program, and it will have the necessary KDE vars to
+  get icons, mime types, etc. working.
+  For example:
+  
+  packageOverrides = pkgs : {
+    kdenliveWrapped = kde4.wrapper kde4.kdenlive;
+  };
+  */
+program:
+
+let
+  libs = with kde4; [ kdelibs kde_runtime oxygen_icons shared_mime_info ] + extra;
+in
+stdenv.mkDerivation {
+  name = program.name + "-wrapped";
+
+  inherit libs;
+
+  buildCommand = ''
+    ensureDir $out/bin
+
+    KDEDIRS=
+    QT_PLUGIN_PATH=
+    for a in $libs; do
+      KDEDIRS=$a''${KDEDIRS:+:}$KDEDIRS
+      QT_PLUGIN_PATH=$a''${KDEDIRS:+:}$KDEDIRS
+    done
+    for a in ${program}/bin/*; do 
+      PROG=$out/bin/`basename $a` 
+    cat > $PROG << END
+      export KDEDIRS=$KDEDIRS
+      export QT_PLUGIN_PATH=$KDEDIRS
+      exec $a "\$@"
+    END
+    chmod +x $PROG
+    done
+  '';
+}

pkgs/top-level/all-packages.nix

@@ -8609,6 +8609,8 @@ let
     in kde4 // {
       inherit kde4;
 
+      wrapper = callPackage ../build-support/kdewrapper {};
+
       recurseForRelease = true;
 
       akunambol = callPackage ../applications/networking/sync/akunambol { };