如何在不影响其他完成脚本的情况下重置COMP_WORDBREAKS? [英] How to reset COMP_WORDBREAKS without affecting other completion script?

问题描述

当我实现bash自动完成功能时，我会把它放在/etc/bash_completion.d/

There is something confuse me when I implement a bash auto-completion function which I'll put it in /etc/bash_completion.d/

为了实现某些功能，我想从变量$COMP_WORDBREAKS中删除分词符冒号(:)，并在$COMP_WORDBREAKS的开头添加斜杠(/).

In order to achieve some feature, I want to remove the word break characters colon (:) from variable $COMP_WORDBREAKS and add a slash (/) at begin of $COMP_WORDBREAKS.

COMP_WORDBREAKS=" /'><=;|&("
_mytool()
{
    local cur=${COMP_WORDS[COMP_CWORD]}
    compopt -o nospace

    # my implement here

    COMPREPLY=( $(compgen ..........my_implement......... -- $cur) )
}
complete -F _mytool mytool

但是，我不能直接重置COMP_WORDBREAKS，因为该值与其他完成脚本共享.到完成函数被调用时，变量COMP_WORDS数组已经被填充，因此局部更改COMP_WORDBREAKS无效.

However, I can't reset COMP_WORDBREAKS directly because the value is shared with other completion scripts. By the time the completion function gets called, variable COMP_WORDS array has already been populated, so locally changes COMP_WORDBREAKS have no effect.

在一个完成脚本中更改COMP_WORDBREAKS有什么解决方案，对其他脚本没有影响吗?

Is there any solution for changing COMP_WORDBREAKS in one completion script and no effect to other script?

$ echo $BASH_VERSION
4.2.10(1)-release

推荐答案

不建议在完成脚本中修改$COMP_WORDBREAKS(因为它是全局变量，可能会影响其他完成脚本的行为，例如ssh).

Modifying $COMP_WORDBREAKS in your completion script is not the recommended way (as it is a global variable and it could affect the behavior of other completion scripts - for example ssh).

但是，bash完成提供了一些辅助方法，可用于实现目标.

However, bash completion offers some helper methods which you can use to achieve your goal.

处理补全单词中不打断字符的推荐方法是使用以下两种辅助方法:

The recommended way to handle non-word-breaking characters in completion words is by using the two helper methods:

• _get_comp_words_by_ref和-n EXCLUDE选项
  
  • 获取完整单词，而无需将EXCLUDE中的字符视为分词
  • _get_comp_words_by_ref with the -n EXCLUDE option
    
    • gets the word-to-complete without considering the characters in EXCLUDE as word breaks
    • 从COMPREPLY项目中删除包含前缀的冒号
      (针对 http://tiswww.case.edu/php/chet/bash/FAQ 的变通方法- E13)
    • removes colon containing prefix from COMPREPLY items
      (a workaround for http://tiswww.case.edu/php/chet/bash/FAQ - E13)

    因此，这是一个如何用补全字处理冒号(:)的基本示例:

    So, here is a basic example of how to a handle a colon (:) in completion words:

    _mytool()
    {
        local cur
        _get_comp_words_by_ref -n : cur
    
        # my implementation here
    
        COMPREPLY=( $(compgen ..........my_implement......... -- $cur) )
    
        __ltrim_colon_completions "$cur"
    }
    complete -F _mytool mytool
    

    最后一个提示是，帮助程序方法位于/etc/bash_completion中.浏览内部，详细了解每种方法，并发现更多的辅助方法.

    As a final tip, the helper methods are located in /etc/bash_completion. Take a look inside to read a detailed description of each method and to discover more helper methods.

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