Added conditional concatenation and used it for name and configureFlags generation.

svn path=/nixpkgs/trunk/; revision=9136

pkgs/applications/editors/vim/default.nix

@@ -12,6 +12,15 @@ let
 	["true" "ncurses"]
 	["false" "libSM"]
 	];
+	nameSuffixes = [
+	"hugeFeatures" "-huge"
+	"x11Support" "-X11"
+	];
+	configFlags = [
+	"true" " --disable-xim "
+	"x11Support" " --enable-gui=auto "
+	"hugeFeatures" "--with-features=huge --enable-cscope --enable-multibyte --enable-xsmp"
+	];
 	buildInputsNames = args.lib.filter (x: (null!=getVal x)) 
 		(args.lib.uniqList {inputList = 
 		(args.lib.concatLists (map 
@@ -20,12 +29,7 @@ let
 in
 	assert args.lib.checkReqs args defList reqsList;
 args.stdenv.mkDerivation {
-  name = "vim-7.1" +
+  name = args.lib.condConcat "vim-7.1" nameSuffixes check;
-	(if (check "hugeFeatures") then 
-	"-huge" else "")
-	+ (if (check "x11Support")
-	then "-X11" else "")
-	;
  
   src = args.fetchurl {
     url = ftp://ftp.nluug.nl/pub/editors/vim/unix/vim-7.1.tar.bz2;
@@ -38,10 +42,7 @@ args.stdenv.mkDerivation {
 
   postInstall = "ln -s $out/bin/vim $out/bin/vi";
   preBuild="touch src/auto/link.sed";
-  configureFlags=" --enable-gui=auto --disable-xim "+
+  configureFlags = args.lib.condConcat "" configFlags check;
-	(if (check "hugeFeatures") then 
-	"--with-features=huge --enable-cscope --enable-multibyte --enable-xsmp "
-	else "");
 
   meta = {
     description = "The most popular clone of the VI editor";

pkgs/lib/default.nix

@@ -172,4 +172,14 @@ rec {
 	in uniqList {outputList=newOutputList; 
 		inputList = (tail inputList);};
 
+  condConcat = name: list: checker:
+	if list == [] then name else
+	if checker (head list) then 
+		condConcat 
+			(name + (head (tail list))) 
+			(tail (tail list)) 
+			checker
+	else condConcat
+		name (tail (tail list)) checker;
+
 }

pkgs/top-level/all-packages.nix

@@ -3363,9 +3363,7 @@ rec {
     inherit (xlibs) libX11 libXext libSM libXpm
 	libXt libXaw libXau;
     inherit (gtkLibs) glib gtk;
-    hugeFeatures = true;
+    flags = ["hugeFeatures" "gtkGUI" "x11Support"];
-    gtkGUI = true;
-    x11Support = true;
   };
 
   vlc = import ../applications/video/vlc {

pkgs/top-level/template.nix

@@ -16,18 +16,26 @@ let
 		(args.lib.concatLists (map 
 		(x:(if (x==[]) then [] else builtins.tail x)) 
 		reqsList));});
+	configFlags = [
+		"true" ""
+(assert false) - fill it; list consists of pairs "condition" "flags". "True" means always.
+	];
+	nameSuffixes = [
+(assert false) - fill it if needed, or blank it.
+	];
 in
 	assert args.lib.checkReqs args defList reqsList;
 with args; 
 args.stdenv.mkDerivation {
-  name = "
+  name = args.lib.condConcat "
-#!!! Fill me //
+#Fill the name //
-" ;
+" nameSuffixes check;
  
   src = args.
 #Put fetcher here 
  
   buildInputs = args.lib.filter (x: x!=null) (map getVal buildInputsNames);
+  configureFlags = args.lib.condConcat "" configFlags check;
 
   meta = {
     description = "