nixos-gui:

- Reduce the number of call the nix-instantiate.
- Improve the option panel, show the name, type, description, value,
example, default value, declarations and definitions files.

svn path=/nixos/trunk/; revision=26951

gui/chrome/content/optionView.js

@@ -188,10 +188,19 @@ OptionView.prototype = {
           opt.load();
         if (opt.isOption)
           opts.push(opt);
+
+        // FIXME: no need to make things slowing down, because our current
+        // callback do not handle multiple option display.
+        if (!opts.empty)
+          break;
       }
+      // FIXME: no need to make things slowing down, because our current
+      // callback do not handle multiple option display.
+      if (!opts.empty)
+        break;
     }
 
-    if (opts.lenght != 0)
+    if (!opts.empty)
       this.selCallback(opts);
   },