support exclude filter #3 (category)

tree.go

@@ -104,6 +104,14 @@ func (t Tree) Filter(filter map[string][]string) (Tree, bool) {
 					}
 					continue
 				}
+				if negative && option == "category" {
+					for _, category := range f.Category {
+						if category == value {
+							exclude = true
+						}
+					}
+					continue
+				}
 				if !negative && strings.Contains(f.Meta[option], value) {
 					addFile = true
 					continue