From 7c33c24f80ee43e3cbf81c263d875f4a67461cc6 Mon Sep 17 00:00:00 2001
From: Sofia <253282481+sofia-riese@users.noreply.github.com>
Date: Mon, 12 Jan 2026 22:31:03 +0800
Subject: [PATCH] style: redesign the install script interface

---
 install.sh | 703 ++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 533 insertions(+), 170 deletions(-)

diff --git a/install.sh b/install.sh
index ebcaff6c..9609ae45 100644
--- a/install.sh
+++ b/install.sh
@@ -1,16 +1,93 @@
 #!/usr/bin/env bash
 # Copyright (C) Juewuy
 
+# ================================= table format tools =================================
+# >>>>>>>>>>>>>>
+
+# set the total width of the menu
+# (adjusting this number will automatically change the entire menu, including the separator lines)
+# note: The number represents the number of columns that appear when the "||" appears on the right
+TABLE_WIDTH=60
+
+# define two extra-long template strings in advance
+# (the length should be greater than the expected TABLE_WIDTH)
+FULL_EQ="===================================================================================================="
+FULL_DASH="- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "
+
+# function to print content lines
+# (using cursor jump)
+content_line() {
+    echo -e " ${1}\033[${TABLE_WIDTH}G||"
+}
+
+# function to print sub content lines
+# for printing accompanying instructions
+sub_content_line() {
+    echo -e "    ${1}\033[${TABLE_WIDTH}G||"
+    content_line
+}
+
+# increase the spacing between the front
+# and back forms to improve readability
+double_line_break() {
+    printf "\n\n"
+}
+
+# function to print separators
+# (using string slicing)
+# parameter $1: pass in "=" or "-"
+separator_line() {
+    local separator_type="$1"
+    local output_line=""
+    local len=$((TABLE_WIDTH - 1))
+
+    if [ "$separator_type" == "=" ]; then
+        output_line="${FULL_EQ:0:$len}"
+    else
+        output_line="${FULL_DASH:0:$len}"
+    fi
+
+    echo "${output_line}||"
+}
+# <<<<<<<<<<<<<<
+# ================================= table format tools =================================
+
+# =============================== display prompt message ===============================
+# >>>>>>>>>>>>>>
+
+abort_install() {
+    double_line_break
+    separator_line "="
+    content_line "安装已取消"
+    separator_line "="
+    double_line_break
+
+    exit 1
+}
+
+invalid_input_retry() {
+    double_line_break
+    separator_line "="
+    content_line "\033[31m输入错误！\033[0m"
+    content_line "\033[31m请重新设置！\033[0m"
+    separator_line "="
+
+    sleep 1
+}
+
+# <<<<<<<<<<<<<<
+# =============================== display prompt message ===============================
+
 [ -z "$url" ] && url="https://testingcf.jsdelivr.net/gh/juewuy/ShellCrash@dev"
 type bash &>/dev/null && shtype=bash || shtype=sh
-[ -n "$(echo -e | grep e)" ] && echo=echo || echo='echo -e'
-echo "***********************************************"
-echo "**                 欢迎使用                  **"
-echo "**                ShellCrash                 **"
-echo "**                             by  Juewuy    **"
-echo "***********************************************"
 
-# Check available capacity
+error_down() {
+    content_line "\033[33m请参考：\033[0m"
+    content_line "\033[33mgithub.com/juewuy/ShellCrash/blob/master/README_CN.md\033[0m"
+    content_line "\033[33m或使用其他安装源重新安装！\033[0m"
+}
+
+# check available capacity
 dir_avail() {
     df -h >/dev/null 2>&1 && h="$2"
     df -P $h "${1:-.}" 2>/dev/null | awk 'NR==2 {print $4}'
@@ -32,7 +109,17 @@ webget() {
         [ "$3" = "echooff" ] && progress='-s' || progress='-#'
         [ -z "$4" ] && redirect='-L' || redirect=''
         result=$(curl -w %{http_code} --connect-timeout 5 $progress $redirect -ko $1 $2)
-        [ -n "$(echo $result | grep -e ^2)" ] && result="200"
+
+        # === original version ===
+        # [ -n "$(echo $result | grep -e ^2)" ] && result="200"
+
+        # === fixed version ===
+        # strictly match the 200 status code to avoid 204 (empty content)
+        # or 202 being mistakenly interpreted as success
+        if [ "$result" = "200" ]; then
+            result="200"
+        fi
+
     else
         if wget --version >/dev/null 2>&1; then
             [ "$3" = "echooff" ] && progress='-q' || progress='-q --show-progress'
@@ -47,28 +134,21 @@ webget() {
     fi
 }
 
-error_down() {
-    $echo "请参考 \033[32mhttps://github.com/juewuy/ShellCrash/blob/master/README_CN.md"
-    $echo "\033[33m使用其他安装源重新安装！\033[0m"
-}
-
 # 安装及初始化
 set_alias() {
     while true; do
-        echo "-----------------------------------------------"
-        $echo "\033[36m请选择一个别名，或使用自定义别名：\033[0m"
-        echo "-----------------------------------------------"
-        $echo " 1 【\033[32mcrash\033[0m】"
-        $echo " 2 【\033[32m sc \033[0m】"
-        $echo " 3 【\033[32m mm \033[0m】"
-        $echo " 0 退出安装"
-        echo "-----------------------------------------------"
-        read -p "请输入相应数字或自定义别名 > " res
+        double_line_break
+        separator_line "="
+        content_line "\033[36m请选择一个别名\033[0m"
+        content_line "\033[36m或直接输入自定义别名\033[0m"
+        separator_line "-"
+        content_line "1) 【\033[32mcrash\033[0m】"
+        content_line "2) 【\033[32m sc  \033[0m】"
+        content_line "3) 【\033[32m mm  \033[0m】"
+        content_line "E) 退出安装"
+        separator_line "="
+        read -p "请输入相应数字/自定义别名> " res
         case "$res" in
-        0)
-            echo "安装已取消"
-            exit 1
-            ;;
         1)
             my_alias=crash
             ;;
@@ -78,41 +158,62 @@ set_alias() {
         3)
             my_alias=mm
             ;;
+        "E" | "e")
+            abort_install
+            ;;
         *)
             my_alias=$res
             ;;
         esac
         cmd=$(ckcmd "$my_alias" | grep 'menu.sh')
         ckcmd "$my_alias" && [ -z "$cmd" ] && {
-            $echo "\033[33m此别名和当前系统内置命令/别名冲突，请换一个！\033[0m"
+            double_line_break
+            separator_line "="
+            content_line "该别名【\033[32m$my_alias\033[0m】和当前系统内置命令／别名\033[33m冲突\033[0m，请更换"
+            separator_line "="
+
             sleep 1
             continue
         }
-        break
+        break 1
     done
 }
 
 gettar() {
-    webget /tmp/ShellCrash.tar.gz "$url/ShellCrash.tar.gz"
+    webget /tmp/ShellCrash.tar.gz "$url/ShellCrash.tar.gz" >/dev/null 2>&1
     if [ "$result" != "200" ]; then
-        $echo "\033[33m文件下载失败！\033[0m"
+        content_line "\033[31m下载失败！\033[0m"
         error_down
+        separator_line "="
+        double_line_break
         exit 1
     else
+        content_line "下载成功"
         $CRASHDIR/start.sh stop 2>/dev/null
         # 解压
-        echo "-----------------------------------------------"
-        echo "开始解压文件！"
+        content_line "开始解压文件......"
         mkdir -p $CRASHDIR >/dev/null
         tar -zxf '/tmp/ShellCrash.tar.gz' -C $CRASHDIR/ || tar -zxf '/tmp/ShellCrash.tar.gz' --no-same-owner -C $CRASHDIR/
         if [ -s $CRASHDIR/init.sh ]; then
+            content_line "解压成功"
+            separator_line "="
             set_alias
             . $CRASHDIR/init.sh >/dev/null
-            [ "$?" != 0 ] && $echo "\033[33m初始化失败，请尝试本地安装！\033[0m" && exit 1
+            if [ $? != 0 ]; then
+                content_line "\033[31m初始化失败，请尝试本地安装！\033[0m"
+                separator_line "="
+                double_line_break
+
+                exit 1
+            fi
+
         else
             rm -rf /tmp/ShellCrash.tar.gz
-            $echo "\033[33m文件解压失败！\033[0m"
+            content_line "\033[31m解压失败！\033[0m"
             error_down
+            separator_line "="
+            double_line_break
+
             exit 1
         fi
     fi
@@ -120,62 +221,162 @@ gettar() {
 
 set_usb_dir() {
     while true; do
-        $echo "请选择安装目录"
-        du -hL /mnt | awk '{print " "NR" "$2"  "$1}'
-        read -p "请输入相应数字 > " num
-        dir=$(du -hL /mnt | awk '{print $2}' | sed -n "$num"p)
-        if [ -z "$dir" ]; then
-            $echo "\033[31m输入错误！请重新设置！\033[0m"
-            continue
-        fi
-        break 1
+        double_line_break
+        separator_line "="
+        content_line "请选择安装目录："
+        separator_line "-"
+
+        # original version
+        # du -hL /mnt | awk '{print " "NR" "$2"  "$1}'
+        du -hL /mnt |
+            awk '{print NR") "$2"    （已用空间："$1"）"}' |
+            while IFS= read -r line; do
+                content_line "$line"
+            done
+
+        content_line "0) 返回上级菜单"
+        separator_line "="
+        read -p "请输入相应数字> " num
+        case "$num" in
+        0)
+            return 1
+            ;;
+        *)
+            dir=$(du -hL /mnt | awk '{print $2}' | sed -n "$num"p)
+            if [ -z "$dir" ]; then
+                invalid_input_retry
+                continue
+            fi
+            return 0
+            ;;
+        esac
     done
 }
 
 set_asus_dir() {
     while true; do
-        echo -e "请选择U盘目录"
-        du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print " "NR" "$2"  "$1}'
-        read -p "请输入相应数字 > " num
-        dir=$(du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print $2}' | sed -n "$num"p)
-        if [ ! -f "$dir/asusware.arm/etc/init.d/S50downloadmaster" ]; then
-            echo -e "\033[31m未找到下载大师自启文件：$dir/asusware.arm/etc/init.d/S50downloadmaster，请检查设置！\033[0m"
-            continue
-        fi
-        break 1
+        double_line_break
+        separator_line "="
+        content_line "请选择U盘目录："
+        separator_line "-"
+
+        # original version
+        # du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print " "NR" "$2"  "$1}'
+        du -hL /tmp/mnt |
+            awk -F/ 'NF<=4 {print NR") "$2"    （已用空间："$1"）"}' |
+            while IFS= read -r line; do
+                content_line "$line"
+            done
+
+        content_line "0) 返回上级菜单"
+        separator_line "="
+        read -p "请输入相应数字> " num
+        case "$num" in
+        0)
+            return 1
+            ;;
+        *)
+            dir=$(du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print $2}' | sed -n "$num"p)
+            if [ ! -f "$dir/asusware.arm/etc/init.d/S50downloadmaster" ]; then
+                double_line_break
+                separator_line "="
+                content_line "\033[33m未找到下载大师自启文件：\033[0m"
+                content_line "\033[33m$dir/asusware.arm/etc/init.d/S50downloadmaster\033[0m"
+                content_line "\033[33m请检查设置！\033[0m"
+                separator_line "="
+
+                continue
+            fi
+            return 0
+            ;;
+        esac
     done
 }
 
 set_cust_dir() {
     while true; do
-        echo "-----------------------------------------------"
-        echo '可用路径 剩余空间：'
-        df -h | awk '{print $6,$4}' | sed 1d
-        echo '路径是必须带 / 的格式，注意写入虚拟内存(/tmp,/opt,/sys...)的文件会在重启后消失！！！'
-        read -p "请输入自定义路径 > " dir
-        if [ "$(dir_avail $dir)" = 0 ] || [ -n "$(echo $dir | grep -E 'tmp|opt|sys')" ]; then
-            $echo "\033[31m路径错误！请重新设置！\033[0m"
-            continue
-        fi
-        break 1
+        double_line_break
+        separator_line "="
+        content_line "\033[33m注意：\033[0m"
+        content_line "\033[33m路径必须是带 / 的格式\033[0m"
+        content_line "\033[33m写入虚拟内存（/tmp，/opt，/sys...）的文件会在重启后消失！\033[0m"
+        separator_line "-"
+        content_line "参考路经："
+        separator_line "-"
+
+        # original version
+        # df -h | awk '{print $6,$4}' | sed 1d
+        df -h |
+            awk 'NR>1 {
+                path="";
+                for(i=6;i<=NF;i++) path=path $i " ";
+                sub(/ $/, "", path);
+                print path "|" $4
+            }' |
+            while IFS='|' read -r mount_point path_avail; do
+                if [ -n "$mount_point" ]; then
+                    i=$((i + 1))
+                    printf -v line_content "%-3s %s" "$i)" "$mount_point"
+                    content_line "$line_content"
+                    sub_content_line " （可用空间：$path_avail）"
+                fi
+            done
+
+        content_line "0) 返回上级菜单"
+        separator_line "="
+        read -p "请输入自定义路径> " dir
+        case "$dir" in
+        0)
+            return 1
+            ;;
+        *)
+            if [ "$(dir_avail "$dir")" = 0 ] || [ -n "$(echo $dir | grep -E 'tmp|opt|sys')" ]; then
+                invalid_input_retry
+                continue
+            fi
+            return 0
+            ;;
+        esac
     done
 }
 
 setdir() {
     while true; do
-        echo "-----------------------------------------------"
-        $echo "\033[33m注意：安装ShellCrash至少需要预留约1MB的磁盘空间\033[0m"
+        double_line_break
+        separator_line "="
+        content_line "\033[33m注意：\033[0m"
+        content_line "\033[33m安装ShellCrash至少需要预留约 1MB 的磁盘空间\033[0m"
         if [ -n "$systype" ]; then
             [ "$systype" = "Padavan" ] && dir=/etc/storage
+
             [ "$systype" = "mi_snapshot" ] && {
-                $echo "\033[33m检测到当前设备为小米官方系统，请选择安装位置\033[0m"
-                [ -d /data ] && $echo " 1 安装到 /data 目录,剩余空间：$(dir_avail /data -h)(支持软固化功能)"
-                [ -d /userdisk ] && $echo " 2 安装到 /userdisk 目录,剩余空间：$(dir_avail /userdisk -h)(支持软固化功能)"
-                [ -d /data/other_vol ] && $echo " 3 安装到 /data/other_vol 目录,剩余空间：$(dir_avail /data/other_vol -h)(支持软固化功能)"
-                $echo " 4 安装到自定义目录(不推荐，不明勿用！)"
-                $echo " 0 退出安装"
-                echo "-----------------------------------------------"
-                read -p "请输入相应数字 > " num
+                content_line "\033[33m检测到当前设备为小米官方系统\033[0m"
+
+                separator_line "-"
+                content_line "请选择安装位置："
+                separator_line "-"
+
+                if [ -d /data ]; then
+                    content_line "1) 安装到 /data 目录"
+                    sub_content_line "剩余空间：$(dir_avail /data -h)（支持软固化功能）"
+                fi
+
+                if [ -d /userdisk ]; then
+                    content_line "2) 安装到 /userdisk 目录"
+                    sub_content_line "剩余空间：$(dir_avail /userdisk -h)（支持软固化功能）"
+                fi
+
+                if [ -d /data/other_vol ]; then
+                    content_line "3) 安装到 /data/other_vol 目录"
+                    sub_content_line "剩余空间：$(dir_avail /data/other_vol -h)（支持软固化功能）"
+                fi
+
+                content_line "4) 安装到自定义目录"
+                sub_content_line "（不推荐，不明勿用！）"
+
+                content_line "E) 退出安装"
+                separator_line "="
+                read -p "请输入相应数字> " num
                 case "$num" in
                 1)
                     dir=/data
@@ -188,51 +389,104 @@ setdir() {
                     ;;
                 4)
                     set_cust_dir
+                    ret=$?
+                    [ "$ret" -eq 1 ] && continue
+                    ;;
+                "E" | "e")
+                    abort_install
                     ;;
                 *)
-                    exit 1
+                    invalid_input_retry
+                    continue
                     ;;
                 esac
             }
+
             [ "$systype" = "asusrouter" ] && {
-                $echo "\033[33m检测到当前设备为华硕固件，请选择安装方式\033[0m"
-                $echo " 1 基于USB设备安装(限23年9月之前固件，须插入\033[31m任意\033[0mUSB设备)"
-                $echo " 2 基于自启脚本安装(仅支持梅林及部分非koolshare官改固件)"
-                $echo " 3 基于U盘+下载大师安装(支持所有固件，限ARM设备，须插入U盘或移动硬盘)"
-                $echo " 0 退出安装"
-                echo "-----------------------------------------------"
-                read -p "请输入相应数字 > " num
+
+                content_line "\033[33m检测到当前设备为华硕固件\033[0m"
+                separator_line "-"
+                content_line "请选择安装方式："
+                separator_line "-"
+
+                content_line "1) 基于USB设备安装"
+                sub_content_line "（限23年9月之前固件，须插入任意USB设备）"
+
+                content_line "2) 基于自启脚本安装"
+                sub_content_line "（仅支持梅林及部分非koolshare官改固件）"
+
+                content_line "3) 基于U盘 + 下载大师安装"
+                sub_content_line "（支持所有固件，限ARM设备，须插入U盘或移动硬盘）"
+
+                content_line "E) 退出安装"
+                separator_line "="
+
+                read -p "请输入相应数字> " num
                 case "$num" in
                 1)
-                    read -p "将脚本安装到USB存储/系统闪存？(1/0) > " res
-                    [ "$res" = "1" ] && set_usb_dir || dir=/jffs
+                    double_line_break
+                    separator_line "="
+                    content_line "请选择脚本安装位置："
+                    separator_line "-"
+                    content_line "1) USB存储"
+                    content_line "2) 系统闪存"
+                    separator_line "="
+                    read -p "请输入相应数字> " num
+                    case "$num" in
+                    1)
+                        set_usb_dir
+                        ;;
+                    *)
+                        dir=/jffs
+                        ;;
+                    esac
+
                     usb_status=1
                     ;;
                 2)
-                    $echo "如无法正常开机启动，请重新使用USB方式安装！"
+                    double_line_break
+                    separator_line "="
+                    content_line "如无法正常开机启动，请重新使用USB方式安装！"
+                    separator_line "="
                     sleep 2
+
                     dir=/jffs
                     ;;
                 3)
-                    echo -e "请先在路由器网页后台安装下载大师并启用，之后选择外置存储所在目录！"
+                    double_line_break
+                    separator_line "="
+                    content_line "请先在路由器网页后台安装下载大师并启用，"
+                    content_line "之后选择外置存储所在目录！"
+                    separator_line "="
                     sleep 2
+
                     set_asus_dir
+                    ret=$?
+                    [ "$ret" -eq 1 ] && continue
+                    ;;
+                "E" | "e")
+                    abort_install
                     ;;
                 *)
-                    exit 1
+                    invalid_input_retry
+                    continue
                     ;;
                 esac
             }
+
             [ "$systype" = "ng_snapshot" ] && dir=/tmp/mnt
         else
-            $echo " 1 在\033[32m/etc目录\033[0m下安装(适合root用户)"
-            $echo " 2 在\033[32m/usr/share目录\033[0m下安装(适合Linux系统)"
-            $echo " 3 在\033[32m当前用户目录\033[0m下安装(适合非root用户)"
-            $echo " 4 在\033[32m外置存储\033[0m中安装"
-            $echo " 5 手动设置安装目录"
-            $echo " 0 退出安装"
-            echo "----------------------------------------------"
-            read -p "请输入相应数字 > " num
+            separator_line "-"
+            content_line "请选择安装目录："
+            separator_line "-"
+            content_line "1) \033[32m/etc目录\033[0m        （适合root用户）"
+            content_line "2) \033[32m/usr/share目录\033[0m  （适合Linux系统）"
+            content_line "3) \033[32m当前用户目录\033[0m    （适合非root用户）"
+            content_line "4) \033[32m外置存储\033[0m"
+            content_line "5) 手动设置"
+            content_line "E) 退出安装"
+            separator_line "="
+            read -p "请输入相应数字> " num
             # 设置目录
             case "$num" in
             1)
@@ -247,87 +501,173 @@ setdir() {
                 ;;
             4)
                 set_usb_dir
+                ret=$?
+                [ "$ret" -eq 1 ] && continue
                 ;;
             5)
                 set_cust_dir
+                ret=$?
+                [ "$ret" -eq 1 ] && continue
+                ;;
+            "E" | "e")
+                abort_install
                 ;;
             *)
-                echo "安装已取消"
-                exit 1
+                invalid_input_retry
+                continue
                 ;;
             esac
         fi
 
-        if [ ! -w $dir ]; then
-            $echo "\033[31m没有$dir目录写入权限！请重新设置！\033[0m"
-            sleep 1
+        if [ ! -w "$dir" ]; then
+            double_line_break
+            separator_line "="
+            content_line "\033[31m没有$dir目录写入权限！\033[0m"
+            content_line "\033[31m请重新设置！\033[0m"
+            separator_line "="
+            sleep 2
         else
-            $echo "目标目录\033[32m$dir\033[0m空间剩余：$(dir_avail $dir -h)"
-            read -p "确认安装？(1/0) > " res
-            if [ "$res" = "1" ]; then
-                CRASHDIR=$dir/ShellCrash
-                break
-            fi
+            while true; do
+                double_line_break
+                separator_line "="
+                content_line "目标目录：\033[32m$dir\033[0m"
+                content_line "可用空间：$(dir_avail $dir -h)"
+                separator_line "-"
+                content_line "1) 确认安装"
+                content_line "E) 退出安装"
+                content_line "0) 返回上级菜单"
+                separator_line "="
+                read -p "请输入相应数字> " num
+                case "$num" in
+                0)
+                    break 1
+                    ;;
+                1)
+                    CRASHDIR="${dir}/ShellCrash"
+                    break 2
+                    ;;
+                "E" | "e")
+                    abort_install
+                    ;;
+                *)
+                    invalid_input_retry
+                    continue
+                    ;;
+                esac
+            done
         fi
     done
 }
 
 install() {
-    echo "-----------------------------------------------"
-    echo "开始从服务器获取安装文件！"
-    echo "-----------------------------------------------"
+    double_line_break
+    separator_line "="
+    content_line "下载安装文件......"
     gettar
-    echo "-----------------------------------------------"
-    echo "ShellCrash 已经安装成功!"
-    [ "$profile" = "~/.bashrc" ] && echo "请执行【. ~/.bashrc > /dev/null】命令以更新环境变量！"
-    [ -n "$(ls -l /bin/sh | grep -oE 'zsh')" ] && echo "请执行【. ~/.zshrc > /dev/null】命令以更新环境变量！"
-    echo "-----------------------------------------------"
-    $echo "\033[33m输入\033[30;47m $my_alias \033[0;33m命令即可管理！！！\033[0m"
-    echo "-----------------------------------------------"
+    double_line_break
+    separator_line "="
+    content_line "ShellCrash 已经安装成功！"
+    [ "$profile" = "~/.bashrc" ] && content_line "请执行【. ~/.bashrc > /dev/null】命令以更新环境变量！"
+    [ -n "$(ls -l /bin/sh | grep -oE 'zsh')" ] && content_line "请执行【. ~/.zshrc > /dev/null】命令以更新环境变量！"
+    content_line "输入\033[32m $my_alias \033[0m命令即可管理！"
+    separator_line "="
+    double_line_break
 }
 
 setversion() {
-    echo "-----------------------------------------------"
-    $echo "\033[33m请选择想要安装的版本：\033[0m"
-    $echo " 1 \033[32m公测版(推荐)\033[0m"
-    $echo " 2 \033[36m稳定版\033[0m"
-    $echo " 3 \033[31m开发版\033[0m"
-    echo "-----------------------------------------------"
-    read -p "请输入相应数字 > " num
-    case "$num" in
-    2)
-        url=$(echo $url | sed 's/master/stable/')
-        ;;
-    3)
-        url=$(echo $url | sed 's/master/dev/')
-        ;;
-    *) ;;
-    esac
+    while true; do
+        double_line_break
+        separator_line "="
+        content_line "请选择安装版本："
+        separator_line "-"
+        content_line "1) \033[32m公测版（推荐）\033[0m"
+        content_line "2) \033[36m稳定版\033[0m"
+        content_line "3) \033[31m开发版\033[0m"
+        content_line "E) 退出安装"
+        separator_line "="
+        read -p "请输入相应数字> " num
+        case "$num" in
+        1)
+            break 1
+            ;;
+        2)
+            url=$(echo "$url" | sed 's/master/stable/')
+            break 1
+            ;;
+        3)
+            url=$(echo "$url" | sed 's/master/dev/')
+            break 1
+            ;;
+        "E" | "e")
+            abort_install
+            ;;
+        *)
+            invalid_input_retry
+            continue
+            ;;
+        esac
+    done
 }
 
+# =============================== the script start here ================================
+
+# clean screen
+printf "\033[H\033[2J"
+
+double_line_break
+separator_line "="
+content_line "                       欢迎使用"
+content_line "                      ShellCrash"
+content_line
+content_line "            支持各种基于 openwrt 的路由器设备"
+content_line "           支持Debian、Centos等标准 Linux 系统"
+content_line "          如遇问题请加TG群反馈：t.me/ShellClash"
+content_line
+content_line "                                            by Juewuy"
+separator_line "="
+
 # 特殊固件识别及标记
 [ -f "/etc/storage/started_script.sh" ] && {
-    systype=Padavan #老毛子固件
+    systype=Padavan # 老毛子固件
     initdir='/etc/storage/started_script.sh'
 }
 [ -d "/jffs" ] && {
-    systype=asusrouter #华硕固件
+    systype=asusrouter # 华硕固件
     [ -f "/jffs/.asusrouter" ] && initdir='/jffs/.asusrouter'
     [ -d "/jffs/scripts" ] && initdir='/jffs/scripts/nat-start'
 }
-[ -f "/data/etc/crontabs/root" ] && systype=mi_snapshot #小米设备
-[ -w "/var/mnt/cfg/firewall" ] && systype=ng_snapshot   #NETGEAR设备
+[ -f "/data/etc/crontabs/root" ] && systype=mi_snapshot # 小米设备
+[ -w "/var/mnt/cfg/firewall" ] && systype=ng_snapshot   # NETGEAR设备
 
 # 检查root权限
 if [ "$USER" != "root" -a -z "$systype" ]; then
-    echo "当前用户:$USER"
-    $echo "\033[31m请尽量使用root用户（不要直接使用sudo命令！）执行安装!\033[0m"
-    echo "-----------------------------------------------"
-    read -p "仍要安装？可能会产生未知错误！(1/0) > " res
-    [ "$res" != "1" ] && exit 1
+    while true; do
+        double_line_break
+        separator_line "="
+        content_line "当前用户 $USER 非 root 用户"
+        content_line "\033[33m请尽量使用 root 用户（不要直接使用sudo命令）执行安装！\033[0m"
+        content_line "\033[31m继续安装，可能会产生未知错误！\033[0m"
+        separator_line "-"
+        content_line "1) 继续安装"
+        content_line "E) 退出安装"
+        separator_line "="
+        read -p "请输入相应数字> " num
+        case "$num" in
+        1)
+            break 1
+            ;;
+        "E" | "e")
+            abort_install
+            ;;
+        *)
+            invalid_input_retry
+            continue
+            ;;
+        esac
+    done
 fi
 
-if [ -n "$(echo $url | grep master)" ]; then
+if [ -n "$(echo "$url" | grep master)" ]; then
     setversion
 fi
 
@@ -337,38 +677,61 @@ webget /tmp/version "$url/version" echooff
 rm -rf /tmp/version
 
 # 输出
-$echo "最新版本：\033[32m$versionsh\033[0m"
-echo "-----------------------------------------------"
-$echo "\033[44m如遇问题请加TG群反馈：\033[42;30m t.me/ShellClash \033[0m"
-$echo "\033[37m支持各种基于openwrt的路由器设备"
-$echo "\033[33m支持Debian、Centos等标准Linux系统\033[0m"
+double_line_break
+separator_line "="
+content_line "最新版本：\033[32m$versionsh\033[0m"
+separator_line "="
 
 if [ -n "$CRASHDIR" ]; then
-    echo "-----------------------------------------------"
-    $echo "检测到旧的安装目录\033[36m$CRASHDIR\033[0m，是否覆盖安装？"
-    $echo "\033[32m覆盖安装时不会移除配置文件！\033[0m"
-    read -p "覆盖安装/卸载旧版本？(1/0) > " res
-    case "$res" in
-    1)
-        install
-        ;;
-    0)
-        rm -rf $CRASHDIR
-        echo "-----------------------------------------------"
-        $echo "\033[31m 旧版本文件已卸载！\033[0m"
-        setdir
-        install
-        ;;
-    9)
-        echo "测试模式，变更安装位置"
-        setdir
-        install
-        ;;
-    *)
-        $echo "\033[31m输入错误！已取消安装！\033[0m"
-        exit 1
-        ;;
-    esac
+    while true; do
+        double_line_break
+        separator_line "="
+        content_line "检测到旧版本安装目录：\033[36m$CRASHDIR\033[0m"
+        content_line "\033[33m注意：覆盖安装时不会移除配置文件！\033[0m"
+        separator_line "-"
+        content_line "1) 覆盖安装"
+        content_line "2) 卸载旧版本"
+        content_line "E) 退出安装"
+        separator_line "="
+        read -p "请输入相应数字> " num
+        case "$num" in
+        1)
+            install
+            break 1
+            ;;
+        2)
+            rm -rf "$CRASHDIR"
+
+            double_line_break
+            separator_line "="
+            content_line "\033[31m旧版本文件已卸载！\033[0m"
+            separator_line "="
+
+            setdir
+            install
+
+            break 1
+            ;;
+        9)
+            double_line_break
+            separator_line "="
+            content_line "测试模式，变更安装位置"
+            separator_line "="
+
+            setdir
+            install
+
+            break 1
+            ;;
+        "E" | "e")
+            abort_install
+            ;;
+        *)
+            invalid_input_retry
+            continue
+            ;;
+        esac
+    done
 else
     setdir
     install