chore: better converter

docs/config.yaml

@@ -942,7 +942,12 @@ rule-providers:
     interval: 259200
     path: /path/to/save/file.yaml
     type: file
-  rule3: # mrs类型ruleset，目前仅支持domain和ipcidr，可以通过“mihomo convert-ruleset domain yaml XXX.yaml XXX.mrs”转换得到
+  rule3:
+    # mrs类型ruleset，目前仅支持domain和ipcidr(即不支持classical），
+    # behavior=domain,format=yaml 可以通过“mihomo convert-ruleset domain yaml XXX.yaml XXX.mrs”转换得到
+    # behavior=domain,format=text 可以通过“mihomo convert-ruleset domain text XXX.text XXX.mrs”转换得到
+    # behavior=ipcidr,format=yaml 可以通过“mihomo convert-ruleset ipcidr yaml XXX.yaml XXX.mrs”转换得到
+    # behavior=ipcidr,format=text 可以通过“mihomo convert-ruleset ipcidr text XXX.text XXX.mrs”转换得到
     type: http
     url: "url"
     format: mrs

rules/provider/domain_strategy.go

@@ -3,6 +3,7 @@ package provider
 import (
 	"errors"
 	"io"
+	"strings"
 
 	"github.com/metacubex/mihomo/component/trie"
 	C "github.com/metacubex/mihomo/constant"
@@ -43,6 +44,10 @@ func (d *domainStrategy) Reset() {
 }
 
 func (d *domainStrategy) Insert(rule string) {
+	if strings.ContainsRune(rule, '/') {
+		log.Warnln("invalid domain:[%s]", rule)
+		return
+	}
 	err := d.domainTrie.Insert(rule, struct{}{})
 	if err != nil {
 		log.Warnln("invalid domain:[%s]", rule)

rules/provider/mrs_converter.go

@@ -2,6 +2,7 @@ package provider
 
 import (
 	"encoding/binary"
+	"errors"
 	"io"
 	"os"
 
@@ -16,6 +17,9 @@ func ConvertToMrs(buf []byte, behavior P.RuleBehavior, format P.RuleFormat, w io
 	if err != nil {
 		return err
 	}
+	if strategy.Count() == 0 {
+		return errors.New("empty rule")
+	}
 	if _strategy, ok := strategy.(mrsRuleStrategy); ok {
 		var encoder *zstd.Encoder
 		encoder, err = zstd.NewWriter(w)