example.sh

#!/bin/bash
export LANG=en_US.UTF-8
#全局变量初始化
sinit() {
  version='0.2.0'
  #菜单名称(默认主页)
  menuname='主页'
}
_blue() {
  printf '\033[0;31;36m%b\033[0m' "$1"
  echo
}
_yellow() {
  printf '\033[0;31;33m%b\033[0m' "$1"
  echo
}
#菜单头部
menutop() {
  clear
  echo
  _blue ">~~~~~~~~~~~~~~ xxx ~~~~~~~~~~~~<  版本:v$version"
  echo
  _yellow "当前菜单: $menuname "
  echo
}
#菜单底部
menubottom() {
  echo
  printf '\033[0;31;36m%b\033[0m' "q: 退出  "
  if [[ "$number" != "" ]]; then printf '\033[0;31;36m%b\033[0m' "  0: 返回主页"; fi
  echo
  echo
  read -ep "请输入命令数字: " number
}

menu() {
  menutop
        options=("$@")
        num_options=${#options[@]}
        # 计算数组中的字符最大长度
        max_len=0
        for ((i = 0; i < num_options; i++)); do
            # 获取当前字符串的长度
            str_len=${#options[i]}

            # 更新最大长度
            if ((str_len > max_len)); then
                max_len=$str_len
            fi
        done
        # 渲染菜单
        for ((i = 0; i < num_options; i += 4)); do
            printf "%s%*s  " "$((i / 2 + 1)): ${options[i]}" "$((max_len - ${#options[i]}))"
            if [[ "${options[i + 2]}" != "" ]]; then printf "$((i / 2 + 2)): ${options[i + 2]}"; fi
            echo
            echo
        done
        echo
        printf '\033[0;31;36m%b\033[0m' "q: 退出  "
        if [[ "$number" != "" ]]; then printf '\033[0;31;36m%b\033[0m' "b: 返回  0: 首页"; fi
        echo
        echo
        # 获取用户输入
        read -ep "请输入命令号: " number
        if [[ $number -ge 1 && $number -le $((num_options / 2)) ]]; then
            #找到函数名索引
            action_index=$((2 * (number - 1) + 1))
            #函数名赋值
            parentfun=${options[action_index]}
            #函数执行
            ${options[action_index]}
            #执行完后自动返回
            waitinput
            ${FUNCNAME[3]}
        elif [[ $number == 0 ]]; then
            main
        elif [[ $number == 'b' ]]; then
            ${FUNCNAME[3]}
        elif [[ $number == 'q' ]]; then
            echo
            exit
        else
            echo
            _red '输入有误  回车返回首页'
            waitinput
            main
        fi
}
options1() {
  menuname='主页/选项1'
  options=("选项11" options1 "选项12" options2 "选项13" options3)

  menu "${options[@]}"
}

options2() {
  menuname='主页/选项2'
  options=("选项21" options1 "选项22" options2)

  menu "${options[@]}"
}

options3() {
  menuname='主页/选项3'
  options=("选项31" options1)

  menu "${options[@]}"
}

options4() {
  menuname='主页/选项4'
  options=("选项41" options1 "选项42" options2 "选项43" options3)

  menu "${options[@]}"
}

main() {
  #定义数组
  options=("选项1" options1 "选项2" options2 "选项3" options3 "选项4" options4)

  #调用函数
  menu "${options[@]}"

}
sinit
main