如何在bash自动完成中仅显示第一级子目录？答案

【问题标题】：How to show only first level subdir in bash auto-completion?如何在bash自动完成中仅显示第一级子目录？
【发布时间】：2017-04-06 17:48:22
【问题描述】：

我有这个 bash 完成文件

#/etc/bash_completion.d/mycommand

_mycommand()
{
    local cur
    COMPREPLY=()

    _init_completion || return

    #Variable to hold the current word
    cur="${COMP_WORDS[COMP_CWORD]}"

    #array variable COMPREPLY

    dirs=('Rootdir/
        Secondrootdir/ 
        Rootdir/Subdir/
        Secondrootdir/Anothersubdir/
        Secondrootdir/Thirdsubdir/
        Secondrootdir/Anothersubdir/Subsubdir/'
    )

    COMPREPLY=($(compgen -W "$dirs" "$cur"))

}

#Assign the auto-completion function _mycommand for our command mycommand.
complete -F _mycommand mycommand

当我有多项选择并按两次 TAB 时，我看到以下内容：

$ mycommand Secondrootdir/
Secondrootdir/
Secondrootdir/Anothersubdir/
Secondrootdir/Anothersubdir/Subsubdir/
Secondrootdir/Thirdsubdir/

但我只想查看当前输入的Secondrootdir

的一级深层子目录

像这样：

$ mycommand Secondrootdir/
Anothersubdir/ Thirdsubdir/

cd 命令做得很好

$ cd Music/
kattymusic/ Playlists/  Relax/

但我不明白 cd 自动完成是如何工作的。

有人可以帮帮我吗？

【问题讨论】：

没有。他们在远程服务器上。而且我只能使用 API 接收它们的列表。
谢谢。很好的例子，但我想要相反的东西。
我会为此付出更大的努力，希望我能成功。
问题是 - 如果我将计算输入斜杠的数量，并在数字+1 斜杠之后修剪输出字符串，那么当我点击制表符时，自动完成将停止。

标签： linux bash shell ubuntu bash-completion

【解决方案1】：

感谢这篇文章

Bash completion: compgen a wordlist as if they were paths - Only suggest up until next slash

最后代码是这样的

#/etc/bash_completion.d/mycommand

_mycommand()
{
    local cur i

    _init_completion || return

    compopt -o filenames

    #Variable to hold the current word
    cur="${COMP_WORDS[COMP_CWORD]}"


    dirs='Rootdir/Subdir/ Secondrootdir/Thirdsubdir/ Secondrootdir/Anothersubdir/Subsubdir/'

    # If we include root dirs we have to remove them
    # e.g we have Secondrootdir/ Secondrootdir/Anothersubdir/ Secondrootdir/Anothersubdir/Subsubdir/'
    # we need to skip the shorties path and remain only the longest one Secondrootdir/Anothersubdir/Subsubdir/'
    # dirs='Rootdir/ 
    #     Secondrootdir/
    #     Rootdir/Subdir/
    #     Secondrootdir/Anothersubdir/
    #     Secondrootdir/Thirdsubdir/
    #     Secondrootdir/Anothersubdir/Subsubdir/'

    arr=($(compgen -W "$dirs" -- $cur))
    for path in "${arr[@]}"
    do

        local trailing_trim

        # Determine what to trim from the end
        trailing_trim="${path#${cur%/*}/}/"
        trailing_trim="${trailing_trim#*/}"
        trailing_trim="${trailing_trim%/}"


        # Don't add a space if there is more to complete
        [[ "$trailing_trim" != "" ]] && compopt -o nospace

        # Remove the slash if mark-directories is off
        if ! _rl_enabled mark-directories
        then
            # If The current typed path doesnt have a slash in it yet check if
            # it is the full first portion of a path and ignore everything after
            # if it is. We don't have to do this once the typed path has a slash
            # in it as the logic above will pick up on it
            [[ "$cur" != */* && "$path" == ${cur}/* ]] && path="$cur/$trailing_trim"    

            trailing_trim="/$trailing_trim"
        fi

        COMPREPLY[i++]="${path%%${trailing_trim}}"

    done



}

#Assign the auto-completion function _mycommand for our command mycommand.
complete -F _mycommand mycommand

【讨论】：

【解决方案2】：

我找到了解决方案，而且非常简单。

只需一行代码就能发挥作用

# This forces readline to only display the last item separated by a slash
compopt -o filenames

【讨论】：