[interchange] Allow gift certificates to be counted correctly as one item by [nitems] tag.

commit 069f95c4a1b7ce7ddcb309c79e71e1f2ed251d9f
Author: Peter Ajamian <[email protected]>
Date:   Wed Apr 25 00:31:22 2012 +1200

    Allow gift certificates to be counted correctly as one item by [nitems] tag.
    
    Currently gift certificates will be counted as several items by [nitems] due to
    the quantity being the amount.  This change allows [nitems] to count a gift
    certificate line as a single item provided:
    
    * The gift_cert field (or equivalent) is added to the AutoModifier line in
      catalog.cfg, and...
    
    * The name of the gift_cert field is passed to the [nitems] tag in the
      gift_cert attribute, typically as [nitems gift_cert=gift_cert]

 lib/Vend/Util.pm |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/lib/Vend/Util.pm b/lib/Vend/Util.pm
index d92e776..ce76ad9 100644
--- a/lib/Vend/Util.pm
+++ b/lib/Vend/Util.pm
@@ -1460,6 +1460,12 @@ sub tag_nitems {
     $total = 0;
     foreach $item (@$cart) {
 		next if $attr and ! $sub->($item->{$attr});
+
+                if ($opt->{gift_cert} && $item->{$opt->{gift_cert}}) {
+                    $total++;
+                    next;
+                }
+
 		$total += $item->{'quantity'};
     }
     $total;