move rule merging to python plugin

filter_plugins/filters.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+import collections
+
+class FilterModule(object):
+	def filters(self):
+		return {
+				'expand_nft_rules': self.expand_nft_rules
+			}
+
+	def expand_nft_rules(self, input_rules, rule_defaults):
+		rules = []
+		for rule_name in input_rules:
+			rule = {
+					'name': rule_name,
+					'comment': rule_name,
+				}
+			for override in rule_defaults:
+				rule.update(override)
+			if not isinstance(input_rules[rule_name], collections.Mapping):
+				rule['matches'] = input_rules[rule_name]
+			else:
+				rule.update(input_rules[rule_name])
+			rules.append(rule)
+		return rules