rxvt-unicode: add optional perl support (I'm keen on tabs and the search feature)

svn path=/nixpkgs/trunk/; revision=17025

pkgs/applications/misc/rxvt_unicode/default.nix

@@ -1,20 +1,34 @@
 args: with args;
-stdenv.mkDerivation (rec {
-  pname = "rxvt-unicode";
+# args.perlSupport: enables perl interpreter support
+# see man urxvtperl for details
+let 
+  name = "rxvt-unicode";
   version = "9.06";
+  n = "${name}-${version}";
+in
+stdenv.mkDerivation (rec {
 
-  name = "${pname}-${version}";
+  name = "${n}${if perlSupport then "-with-perl" else ""}";
 
- src = fetchurl {
-    url = "http://dist.schmorp.de/rxvt-unicode/Attic/${name}.tar.bz2";
+  src = fetchurl {
+    url = "http://dist.schmorp.de/rxvt-unicode/Attic/${n}.tar.bz2";
     sha256 = "8ef9359c01059efd330626c6cd7b082be9bf10587f2b9fe84caa43a84aa576d1";
   };
 
-  buildInputs = [ libX11 libXt libXft ncurses /* required to build the terminfo file */ ];
+  buildInputs = [ libX11 libXt libXft ncurses /* required to build the terminfo file */ ]
+          ++ lib.optional perlSupport perl;
 
   preConfigure=''
-    configureFlags="--disable-perl";
+    configureFlags="${if perlSupport then "--enable-perl" else "--disable-perl"}";
     export TERMINFO=$out/share/terminfo # without this the terminfo won't be compiled by tic, see man tic
+  ''
+  # make urxvt find its perl file lib/perl5/site_perl is added to PERL5LIB automatically
+  + (if perlSupport then ''
+      ensureDir $out/lib/perl5
+      ln -s $out/{lib/urxvt,lib/perl5/site_perl}
+  '' else "");
+
+  postInstall = ''
   '';
 
   meta = {

pkgs/top-level/all-packages.nix

@@ -7075,9 +7075,10 @@ let
   };
 
   # = urxvt
-  rxvt_unicode = import ../applications/misc/rxvt_unicode {
+  rxvt_unicode = makeOverridable (import ../applications/misc/rxvt_unicode) {
     inherit lib fetchurl stdenv perl ncurses;
     inherit (xlibs) libXt libX11 libXft;
+    perlSupport = false;
   };
 
   sbagen = import ../applications/misc/sbagen {