bash:嵌套的选择菜单，仅第一个选择起作用，第二个选择不起作用 [英] bash: nested select menu, only first selection works, the second selection doesnt

问题描述

我的脚本中有两个功能，两个都是嵌套在其中的选择"菜单.它们都起作用，但是仅第一个选择有效，而第二个选择无效.我显然对他们俩都做错了.现在，我将仅提供我的一个功能，因为我猜我在两个功能上都犯了相同的错误.

I have two functions in my script, both are 'select' menus with other 'select' menus nested within. Both of them work, but only the first selection, not the second selection. I am obviously doing something wrong on them both. For now, I will provide just one of my functions as Im guessing that I am making the same mistake on both of them.

问题:第一个菜单的所有第一部分(流")都可以正常运行，而第二部分(下载")则不能.

Problem: All of the first part of the first menu ("Stream") works perfectly, the second part ("Download") does not though.

为什么不起作用?我在做什么错?

#!/bin/env bash

MAIN(){
  echo "Stream Or Download?"
  select S_D in 'Stream' 'Download'; do
    case $S_D in
    Stream)
      echo "Audio Or Video?"
      select A_V in 'Audio' 'Video'; do
        case $A_V in
        Audio)
          if [[ "$DOMAIN" =~ 'youtube' ]]; then
            mpv --no-video "$URL"
          else
            streamlink --player='mpv --no-video' "$URL" 720p|& tee /dev/null
          fi
          break 2 ;;
        Video)
          if [[ "$DOMAIN" =~ 'youtube' ]]; then
            am start -a android.intent.action.VIEW -d "$(youtube-dl -f best -g "$URL")" -n is.xyz.mpv/.MPVActivity &> /dev/null
          else
            am start -a android.intent.action.VIEW -d "$(streamlink "$URL")" -n is.xyz.mpv/.MPVActivity &> /dev/null
          fi
          break 2 ;;
    Download)
      echo "Song? Album? Playlist?"
      select S_A_P in 'Song' 'Album' 'Playlist'; do
        case $S_A_P in
        Song)
          echo "Enter Artist:"
          read ARTIST
          echo "Enter Song:"
          read SONG
            youtube-dl --extract-audio --prefer-ffmpeg --audio-format m4a --output "$MUSIC_DIR/$ARTIST - $SONG.%(ext)s" "$URL"
            mid3v2 -v -a "$ARTIST" -S "$SONG" "$MUSIC_DIR/$ARTIST - $SONG.m4a"
            break 2 ;;
        Album)
          echo "Enter Artist:"
          read ARTIST
          echo "Enter Album:"
          read ALBUM
            youtube-dl --extract-audio --prefer-ffmpeg --audio-format m4a --output "$MUSIC_DIR/$ARTIST - $ALBUM.%(ext)s" "$URL"
            mid3v2 -v -a "$ARTIST" -A "$ALBUM" "$MUSIC_DIR/$ARTIST - $ALBUM.m4a"
            break 2 ;;
        Playlist)
          echo "Enter Artist/DJ Or Leave It Empty:"
          read ARTIST
          echo "Enter A Title:"
          read TITLE
          if [[ -z "$ARTIST" ]]; then
            youtube-dl --extract-audio --prefer-ffmpeg --audio-format m4a --output "$MUSIC_DIR/$TITLE.%(ext)s" "$URL"
            mid3v2 -v -A "$TITLE" "$MUSIC_DIR/$TITLE.m4a"
          else
            youtube-dl --extract-audio --prefer-ffmpeg --audio-format m4a --output "$MUSIC_DIR/$ARTIST - $TITLE.%(ext)s" "$URL"
            mid3v2 -v -a "$ARTIST" -A "$TITLE" "$MUSIC_DIR/$ARTIST - $TITLE.m4a"
          fi
          break ;;
      esac
      done
      break ;;
    esac
    done
    break ;;
  esac
  done
}

推荐答案

假定 case $ A_V 块只有2个选项( Audio ， Video )，则匹配的 esac 语句放置在错误的位置(混乱的缩进无济于事):

Assuming the case $A_V block has just 2 options (Audio, Video), the matching esac statement is in the wrong place (messy indentations don't help):

    case $S_D in
    Stream)
        ...
        case $A_V in
        Audio)
          ...
        Video)
          ...
                            # `esac` for `case $A_V` should reside on this line
    Download)
        ...
        case $S_A_P in
        Song)
        ...
        Album)
        ...
        Playlist)
        ...
      esac                  # first esac closes `case $S_A_P`
      ...
    esac                    # second esac closes `case $A_V` **THIS IS THE PROBLEM! THIS NEEDS TO BE MOVED JUST BEFORE THE ** `Download` **LINE.**
    ...
  esac                      # last esac closes `case $S_D`

注意::OP还需要使用 esac 语句

NOTE: OP will also need to move the associated done/break statements with the esac statement

原因:每个单独的 select 菜单都必须以 esac / done 结尾不继续下一个选择.OP没有正确关闭 case $ A_V .

REASON: Each individual select menu must finish with esac/done at the very end or it will not continue to the next selection. OP didnt close case $A_V properly.

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