libass: refactor & 0.11.1 -> 0.12.1

pkgs/development/libraries/libass/default.nix

@@ -1,34 +1,53 @@
 { stdenv, fetchurl, pkgconfig, yasm
-, freetype, fribidi, fontconfig
-, enca ? null
-, harfbuzz ? null
+, freetype ? null
+, fribidi ? null
+, encaSupport ? true, enca ? null # enca support
+, fontconfigSupport ? true, fontconfig ? null # fontconfig support
+, harfbuzzSupport ? true, harfbuzz ? null # harfbuzz support
+, rasterizerSupport ? false # Internal rasterizer
+, largeTilesSupport ? false # Use larger tiles in the rasterizer
 }:
 
+assert ((freetype != null) && (fribidi != null));
+assert encaSupport -> (enca != null);
+assert fontconfigSupport -> (fontconfig != null);
+assert harfbuzzSupport -> (harfbuzz != null);
+
 let
-  version = "0.11.1";
-  sha256 = "1b0ki1zdkhflszzj5qr45j9qsd0rfbb6ws5pqkny8jhih0l3lxwx";
-  baseurl = "https://github.com/libass/libass/releases/download";
-in stdenv.mkDerivation rec {
+  mkFlag = optSet: flag: if optSet then "--enable-${flag}" else "--disable-${flag}";
+in
+
+with stdenv.lib;
+stdenv.mkDerivation rec {
   name = "libass-${version}";
+  version = "0.12.1";
 
   src = fetchurl {
-    url = "${baseurl}/${version}/${name}.tar.xz";
-    inherit sha256;
+    url = "https://github.com/libass/libass/releases/download/${version}/${name}.tar.xz";
+    sha256 = "1mwj2nk9g6cq6f8m1hf0ijg1299rghhy9naahqq43sc2whblb1l7";
   };
 
+  configureFlags = [
+    (mkFlag encaSupport "enca")
+    (mkFlag fontconfigSupport "fontconfig")
+    (mkFlag harfbuzzSupport "harfbuzz")
+    (mkFlag rasterizerSupport "rasterizer")
+    (mkFlag largeTilesSupport "large-tiles")
+  ];
+
   nativeBuildInputs = [ pkgconfig yasm ];
 
-  buildInputs = [
-    freetype fribidi fontconfig
-    enca harfbuzz
-  ];
+  buildInputs = [ freetype fribidi ]
+    ++ optional encaSupport enca
+    ++ optional fontconfigSupport fontconfig
+    ++ optional harfbuzzSupport harfbuzz;
 
   meta = {
     description = "Portable ASS/SSA subtitle renderer";
-    homepage = http://code.google.com/p/libass/;
-    license = stdenv.lib.licenses.isc;
-    platforms = stdenv.lib.platforms.linux;
-    maintainers = [ stdenv.lib.maintainers.urkud ];
+    homepage    = https://github.com/libass/libass;
+    license     = licenses.isc;
+    platforms   = platforms.linux;
+    maintainers = with maintainers; [ codyopel urkud ];
     repositories.git = git://github.com/libass/libass.git;
   };
 }