refactor: preserve template yaml structure

common/rule.go

@@ -3,17 +3,11 @@ package common
 import (
 	"fmt"
 	"strings"
-
-	"github.com/bestnite/sub2clash/model"
 )
 
 func PrependRuleProvider(
-	sub *model.Subscription, providerName string, group string, provider model.RuleProvider,
+	sub *generatedConfig, providerName string, group string,
 ) {
-	if sub.RuleProvider == nil {
-		sub.RuleProvider = make(map[string]model.RuleProvider)
-	}
-	sub.RuleProvider[providerName] = provider
 	PrependRules(
 		sub,
 		fmt.Sprintf("RULE-SET,%s,%s", providerName, group),
@@ -21,26 +15,29 @@ func PrependRuleProvider(
 }
 
 func AppenddRuleProvider(
-	sub *model.Subscription, providerName string, group string, provider model.RuleProvider,
+	sub *generatedConfig, providerName string, group string,
 ) {
-	if sub.RuleProvider == nil {
-		sub.RuleProvider = make(map[string]model.RuleProvider)
-	}
-	sub.RuleProvider[providerName] = provider
 	AppendRules(sub, fmt.Sprintf("RULE-SET,%s,%s", providerName, group))
 }
 
-func PrependRules(sub *model.Subscription, rules ...string) {
+// PrependRules 用于在规则头部插入新规则。
+// 这通常对应用户显式要求 prepend 的场景。
+func PrependRules(sub *generatedConfig, rules ...string) {
 	if sub.Rule == nil {
 		sub.Rule = make([]string, 0)
 	}
 	sub.Rule = append(rules, sub.Rule...)
 }
 
-func AppendRules(sub *model.Subscription, rules ...string) {
+// AppendRules 在规则尾部追加，但如果尾部已有 MATCH，则保持 MATCH 仍然是最后一条。
+func AppendRules(sub *generatedConfig, rules ...string) {
 	if sub.Rule == nil {
 		sub.Rule = make([]string, 0)
 	}
+	if len(sub.Rule) == 0 {
+		sub.Rule = append(sub.Rule, rules...)
+		return
+	}
 	matchRule := sub.Rule[len(sub.Rule)-1]
 	if strings.Contains(matchRule, "MATCH") {
 		sub.Rule = append(sub.Rule[:len(sub.Rule)-1], rules...)