add nsfw class to relevant gallery items

but only on galleries showing nsfw at all

make-pages/Depend.hs

@@ -63,13 +63,15 @@ dependGallery' (GalleryInfo {title, prefix, filters}) infos' build data_ tmp =
     $@path: $@pages' $@files'
     	echo "[gallery] "$$@
     	mkdir -p $$(dir $$@)
-    	$$(MAKEPAGES) $$(MPFLAGS) gallery -t "$*title" -o "$$@" \
+    	$$(MAKEPAGES) $$(MPFLAGS) gallery -t "$*title" $flags -o "$$@" \
     	  $$(filter $$(DATADIR)/%/$$(INFONAME),$$^)
 
     $rules
 
     $incs
   |]
+ where
+  flags = filtersToFlags filters
 
 makeRules :: FilePath -- ^ prefix
           -> GalleryFilters