From d7b150732858e98a563a89fa331fbc481e45f4ee Mon Sep 17 00:00:00 2001
From: Maxim Kurbatov <max@cubly.ru>
Date: Sun, 17 Nov 2024 19:09:29 +0500
Subject: [PATCH] Make code compatible with golang 1.20 to support armv7-2.6
 and x86-2.6

---
 go.mod        |  2 +-
 lib/router.go | 21 ++++++++++++++++++---
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/go.mod b/go.mod
index dcc9761..e786ea7 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module maksimkurb/keenetic-pbr
 
-go 1.22
+go 1.20
 
 require github.com/BurntSushi/toml v1.4.0
diff --git a/lib/router.go b/lib/router.go
index a2872d8..ab172e2 100644
--- a/lib/router.go
+++ b/lib/router.go
@@ -7,7 +7,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"slices"
+	"sort"
 	"strings"
 )
 
@@ -118,8 +118,7 @@ func ApplyLists(config *Config) error {
 			}
 			defer f.Close()
 
-			slices.Sort(domains)
-			domains = slices.Compact(domains)
+			domains = removeDuplicates(domains)
 
 			writer := bufio.NewWriter(f)
 			for _, domain := range domains {
@@ -134,3 +133,19 @@ func ApplyLists(config *Config) error {
 	log.Print("Configuration applied successfully")
 	return nil
 }
+
+func removeDuplicates(strings []string) []string {
+	sort.Strings(strings)
+	// Remove duplicates
+	if len(strings) > 0 {
+		j := 1
+		for i := 1; i < len(strings); i++ {
+			if strings[i] != strings[i-1] {
+				strings[j] = strings[i]
+				j++
+			}
+		}
+		strings = strings[:j]
+	}
+	return strings
+}