Ultrastar (#26524)

* ultrastardx-beta: init at 1.3.5

* libbass, libbass_fx: init at 24

* ultrastar-creator: init at 2017-04-12

* buildSupport/plugins.nix: add diffPlugins

Helper function to compare expected plugin lists to the found plugins.

* ultrastar-manager: init at 2017-05-24

The plugins are built in their own derivations, speeding up (re-)compilation.
The `diffPlugins` function from `beets` is reused to test for changes in the
plugin list on updates.

* beets: switch to diffPlugins

The function is basically just extracted for better reusability.

pkgs/tools/misc/ultrastar-creator/default.nix

@@ -0,0 +1,41 @@
+{ stdenv, fetchFromGitHub
+, qmakeHook, qtbase, makeQtWrapper
+, pkgconfig, taglib, libbass, libbass_fx }:
+
+stdenv.mkDerivation rec {
+  name = "ultrastar-creator-${version}";
+  version = "2017-04-12";
+
+  src = fetchFromGitHub {
+    owner = "UltraStar-Deluxe";
+    repo = "UltraStar-Creator";
+    rev = "ac519a003f8283bfbe5e2d8e9cdff3a3faf97001";
+    sha256 = "00idr8a178gvmylq722n13bli59kpxlsy5d8hlplqn7fih48mnzi";
+  };
+
+  postPatch = with stdenv.lib; ''
+    # we don’t want prebuild binaries checked into version control!
+    rm -rf lib include
+    sed -e "s|DESTDIR =.*$|DESTDIR = $out/bin|" \
+        -e 's|-L".*unix"||' \
+        -e "/QMAKE_POST_LINK/d" \
+        -e "s|../include/bass|${getLib libbass}/include|g" \
+        -e "s|../include/bass_fx|${getLib libbass_fx}/include|g" \
+        -e "s|../include/taglib|${getLib taglib}/include|g" \
+        -i src/UltraStar-Creator.pro
+  '';
+
+  preConfigure = ''
+    cd src
+  '';
+
+  nativeBuildInputs = [ qmakeHook makeQtWrapper pkgconfig ];
+  buildInputs = [ qtbase taglib libbass libbass_fx ];
+
+  meta = with stdenv.lib; {
+    description = "Ultrastar karaoke song creation tool";
+    homepage = https://github.com/UltraStar-Deluxe/UltraStar-Creator;
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ profpatsch ];
+  };
+}