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可以将线绘字符（或颜色）添加到 Bash 文件列表菜单吗？

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可以将线绘字符（或颜色）添加到 Bash 文件列表菜单吗？

我使用我学习的第一个 Linux 工具 BASH 创建了世界上最丑陋的菜单。

菜单是什么样的

The following /usr/local/bin/bell/sounds were found
1) /usr/local/bin/bell/sounds/Amsterdam.ogg
2) /usr/local/bin/bell/sounds/bell.ogg
3) /usr/local/bin/bell/sounds/Blip.ogg
4) /usr/local/bin/bell/sounds/default.ogg
5) /usr/local/bin/bell/sounds/Mallet.ogg
6) /usr/local/bin/bell/sounds/message.ogg
7) /usr/local/bin/bell/sounds/Positive.ogg
8) /usr/local/bin/bell/sounds/Rhodes.ogg
9) /usr/local/bin/bell/sounds/Slick.ogg
'a' to hear to all files, use number to hear a single file, 
'u' to update last single file heard as new default, or 'q' to quit:

代码

#! /bin/bash

# NAME: bell-select-menu
# PATH: /usr/local/bin
# DESC: Present menu of bell sounds to listen to all, listen to one and update default.
# CALL: bell-select-menu
# DATE: Created Oct 1, 2016.

echo "The following /usr/local/bin/bell/sounds were found"

# set the prompt used by select, replacing "#?"
PS3="'a' to hear to all files, use number to hear a single file, 
'u' to update last single file heard as new default, or 'q' to quit: "

lastfile="none"

# allow the user to choose a file
select filename in /usr/local/bin/bell/sounds/*.ogg

do

    # leave the loop if the user types 'q'
    if [[ "$REPLY" == q ]]; then break; fi

    # play all if the user types 'a'
    if [[ "$REPLY" == a ]] 
    then 
        playall-bells
        continue
    fi

    # update last file name as new default if the user types 'u'
    if [[ "$REPLY" == u ]]
    then
        if [[ "$lastfile" == none ]]
        then
            echo "No file was selected."
            break
        fi
        echo "$lastfile selected"
        cp $lastfile /usr/local/bin/bell/sounds/default.ogg
        load-default-bell
        break
    fi

    # complain if no file was selected, and loop to ask again
    if [[ "$filename" == "" ]]
    then
        echo "'$REPLY' is not a valid number"
        continue
    else
        lastfile="$filename"
    fi

    # listen to the selected file
    ogg123 "$filename"

    # loop back to ask for another
    continue
done

我根据 AskUbuntu 上的一个回答编写了代码：根据文件列表创建 bash 菜单（将文件映射到数字）。由于用户反复输入选项，菜单会滚出屏幕，因此需要调整循环。

世界上最丑陋的菜单是自动生成的，所以我无法在左侧和右侧硬编码 ASCII 线绘制字符。我需要调用程序来重新格式化菜单吗？

菜单的大部分内容由单个 bash 命令生成：

select filename in /usr/local/bin/bell/sounds/*.ogg

我阅读了 Bash 手册中关于该select语句的内容，但没有看到任何选项。是否有可以调用来按摩屏幕的程序？

我发现的最接近的东西被称为tput这里描述的：linuxcommand.org/lc3_adv_tput但我不确定它对于解决这个问题是否实用。

提前致谢 ：）

PS 此菜单是消除终端中恼人的扬声器蜂鸣声的工具之一，gedit如下所述：在 Ubuntu 16.04 回归中关闭主板/PC 扬声器“哔”声

编辑-合并已接受的答案

非常感谢 wjandrea 发布代码来清理菜单。在接受答案之前，我已经在echo字符串和 PS3（提示）中添加了颜色代码。我还加入了一个循环来重新绘制菜单，以防止它滚出屏幕。我还加入了一个reset在重新绘制之前清除屏幕的命令。这可以防止更多旧的副本（有时会被截断）和新的菜单副本同时出现。

全新菜单外观

从终端文本输出复制并粘贴到 AskUbuntu 时，颜色无法准确显示。

=====  Sound Files for Bell in /usr/local/bin/bell/sounds/  ====

1) Amsterdam.ogg  4) default.ogg    7) Positive.ogg
2) bell.ogg       5) Mallet.ogg     8) Rhodes.ogg
3) Blip.ogg       6) message.ogg    9) Slick.ogg

===========================  Options  ==========================

'a' to hear to all files, use number to hear a single file, 
'u' update last number heard as new bell default, 'q' to quit:

这就是现在屏幕上显示的全部内容。没有$ sudo bell-menu可见的调用语句。没有可见的以前输入的命令的历史记录。

屏幕截图准确显示了颜色，您可以看到屏幕已被编程遮蔽：

铃声菜单

新菜单代码

#! /bin/bash

# NAME: bell-menu
# PATH: /usr/local/bin
# DESC: Present menu of bell sounds to listen to all, listen to one and update default.
# CALL: sudo bell-menu
# DATE: Created Oct 6, 2016.

# set the prompt used by select, replacing "#?"
PS3="
===========================  Options  ==========================

$(tput setaf 2)'$(tput setaf 7)a$(tput setaf 2)' to hear to all files, use $(tput setaf 7)number$(tput setaf 2) to hear a single file, 
'$(tput setaf 7)u$(tput setaf 2)' update last number heard as new bell default, '$(tput setaf 7)q$(tput setaf 2)' to quit: $(tput setaf 7)"

cd /usr/local/bin/bell/sounds/

# Prepare variables for loops
lastfile="none"
wend="n"

while true; do

  tput reset # Clear screen so multiple menu calls can't be seen.

  echo
  echo -e "===== \e[46m Sound Files for Bell in /usr/local/bin/bell/sounds/ \e[0m ===="
  echo

  # allow the user to choose a file
  select soundfile in *.ogg; do

    case "$REPLY" in
        q) # leave the loop if the user types 'q'
            wend="y" # end while loop
            break    # end do loop
            ;;
        a) # play all if the user types 'a'
            playall-bells
            break    # end do loop
            ;;
        u) # update last file name as new default if the user types 'u'
            if [[ "$lastfile" == none ]]; then
                echo "No file has been heard to update default. Listen first!"
                continue  # do loop repeat
            fi
            echo "$lastfile selected"
            cp "$lastfile" default.ogg
            load-default-bell
            wend="y" # end while loop
            break    # end do loop
            ;;
    esac

    # complain if no file was selected, and loop to ask again
    if [[ "$soundfile" == "" ]]; then
        echo "$REPLY: not a valid selection."
        continue    # repeat do loop
    else
        lastfile="$soundfile"
    fi

    # listen to the selected file
    canberra-gtk-play --file="$soundfile"

    # loop back to ask for another
    break
  done
  if [[ "$wend" == "y" ]]; then break; fi

done

菜单已从 重命名为bell-select-menu。bell-menu由于它位于 中，因此/usr/local/bin需要使用 来调用sudo bell-menu，并且注释已更新以反映这一事实。

只需一点点努力世界上最丑的菜单现在变成了看起来可以接受的（但不漂亮）菜单。

答案1

以下是我的做法。我所做的最重要的改变是，脚本在列出文件之前移动到目录，并以相对路径而不是绝对路径列出文件。

另外，我把它做得$PS3更小；canberra-gtk-play因为它是预先安装的，而ogg123不是预先安装的；并且使用一个case语句而不是多个if语句。

由于我正在运行 14.04，因此我无法测试它。

#! /bin/bash

# NAME: bell-select-menu
# PATH: /usr/local/bin
# DESC: Present menu of bell sounds to listen to all, listen to one and update default.
# CALL: bell-select-menu
# DATE: Created Oct 1, 2016.

# set the prompt used by `select`, replacing "#?"
PS3=": "

echo "Options:
a) Play all 
u) Set the last file played as the new default
q) Quit
The following sounds were found in /usr/local/bin/bell/sounds/:"

cd /usr/local/bin/bell/sounds/

# Prepare var for the loop.
lastfile="none"

# allow the user to choose a file
select soundfile in *.ogg; do

    case "$REPLY" in
        q) # leave the loop if the user types 'q'
            break
            ;;
        a) # play all if the user types 'a'
            playall-bells
            continue
            ;;
        u) # update last file name as new default if the user types 'u'
            if [[ "$lastfile" == none ]]; then
                echo "No file was selected."
                break
            fi
            echo "$lastfile selected"
            cp "$lastfile" default.ogg
            load-default-bell
            break
            ;;
    esac

    # complain if no file was selected, and loop to ask again
    if [[ "$soundfile" == "" ]]; then
        echo "$REPLY: not a valid selection."
        continue
    else
        lastfile="$soundfile"
    fi

    # listen to the selected file
    canberra-gtk-play --file="$soundfile"

    # loop back to ask for another
    continue
done

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