Simplify helpers under line cap

iptables-forward.sh

@@ -46,6 +46,15 @@ usage() {
 USAGE
 }
 
+MENU_LINES=(
+  '[1] 查看所有转发规则'
+  '[2] 添加新的转发规则'
+  '[3] 删除现有转发规则'
+  '[4] 查看系统环境状态'
+  '[5] 立即保存到磁盘'
+  '[0] 退出'
+)
+
 bootstrap() {
   if [[ ${IPF_SKIP_ENV_CHECK} != 1 ]]; then
     env_check_all
@@ -54,7 +63,7 @@ bootstrap() {
 }
 
 render_main_menu() {
-  local status persist count width
+  local status persist count width line
   status=$(env_status_summary)
   count=$(storage_count)
   if persist_available; then
@@ -64,31 +73,20 @@ render_main_menu() {
   fi
 
   if use_box_ui; then
-    width=$(term_width)
-    if (( width > 78 )); then
-      width=78
-    fi
+    width=$(box_width)
     box_top "${width}"
     box_line "${width}" "${IPF_APP_NAME}"
     box_separator "${width}"
     box_line "${width}" "状态: ${status}    规则数: ${count}    持久化: ${persist}"
     box_separator "${width}"
-    box_line "${width}" '[1] 查看所有转发规则'
-    box_line "${width}" '[2] 添加新的转发规则'
-    box_line "${width}" '[3] 删除现有转发规则'
-    box_line "${width}" '[4] 查看系统环境状态'
-    box_line "${width}" '[5] 立即保存到磁盘'
-    box_line "${width}" '[0] 退出'
+    for line in "${MENU_LINES[@]}"; do
+      box_line "${width}" "${line}"
+    done
     box_bottom "${width}"
   else
     printf '%s\n' "${IPF_APP_NAME}"
     printf '状态: %s | 规则数: %s | 持久化: %s\n' "${status}" "${count}" "${persist}"
-    printf '[1] 查看所有转发规则\n'
-    printf '[2] 添加新的转发规则\n'
-    printf '[3] 删除现有转发规则\n'
-    printf '[4] 查看系统环境状态\n'
-    printf '[5] 立即保存到磁盘\n'
-    printf '[0] 退出\n'
+    printf '%s\n' "${MENU_LINES[@]}"
   fi
 }