jdiskreport: cleanup and add desktop item

pkgs/tools/misc/jdiskreport/default.nix

@@ -1,22 +1,51 @@
-{ stdenv, fetchurl, unzip, jre }:
+{ stdenv, fetchurl, unzip, jre, makeDesktopItem }:
 
+let
+  desktopItem = makeDesktopItem {
+    desktopName = "JDiskReport";
+    genericName = "A graphical utility to visualize disk usage";
+    categories = "Utility;";
+    exec = "jdiskreport";
+    name = "jdiskreport";
+    type = "Application";
+  };
+in
 stdenv.mkDerivation {
   name = "jdiskreport-1.4.1";
 
-  builder = ./builder.sh;
-
   src = fetchurl {
     url = http://www.jgoodies.com/download/jdiskreport/jdiskreport-1_4_1.zip;
     sha256 = "0d5mzkwsbh9s9b1vyvpaawqc09b0q41l2a7pmwf7386b1fsx6d58";
   };
 
   buildInputs = [ unzip ];
-
   inherit jre;
 
-  meta = {
+  installPhase = ''
+    source $stdenv/setup
+
+    unzip $src
+
+    jar=$(ls */*.jar)
+
+    mkdir -p $out/share/java
+    mv $jar $out/share/java
+
+    mkdir -p $out/bin
+    cat > $out/bin/jdiskreport <<EOF
+    #! $SHELL -e
+    exec $jre/bin/java -jar $out/share/java/$(basename $jar)
+    EOF
+    chmod +x $out/bin/jdiskreport
+
+    ${desktopItem.buildCommand}
+  '';
+
+  meta = with stdenv.lib; {
     homepage = http://www.jgoodies.com/freeware/jdiskreport/;
     description = "A graphical utility to visualize disk usage";
-    license = stdenv.lib.licenses.unfreeRedistributable; #TODO freedist, libs under BSD-3
+    license = licenses.unfreeRedistributable; #TODO freedist, libs under BSD-3
+    platforms = [ "x86_64-linux" ];
+    maintainers = with maintainers; [ kylesferrazza ];
   };
 }