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

当我实现一个 bash 自动完成功能时，有些东西让我感到困惑，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 (:) 并添加斜线 (/) 在 $COMP_WORDBREAKS 的开头.

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，我无法直接重置 COMP_WORDBREAKS，因为该值与其他完成脚本共享.当完成函数被调用时，变量 COMP_WORDS 数组已经被填充，所以本地更改 COMP_WORDBREAKS 没有任何影响.

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.

是否有任何解决方案可以在一个完成脚本中更改 COMP_WORDBREAKS 而对其他脚本没有影响?

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

在完成脚本中修改 $COMP_WORDBREAKS 不是推荐的方式(因为它是一个全局变量，它可能会影响其他完成脚本 - 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 补全提供了一些辅助方法，您可以使用它们来实现目标.

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

在完成词中处理非断字字符的推荐方法是使用两种辅助方法:

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

• _get_comp_words_by_ref 带有 -n EXCLUDE 选项
  
  • 在不将 EXCLUDE 中的字符视为分词符的情况下获取完整单词
  • 从 COMPREPLY 项目中删除包含前缀的冒号
    (http://tiswww.case.edu/php/chet/bash/FAQ 的解决方法 -E13)
  • removes colon containing prefix from COMPREPLY items
    (a workaround for http://tiswww.case.edu/php/chet/bash/FAQ - E13)

  所以，这里有一个基本示例，说明如何处理完成词中的冒号 (:):

  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
  

  作为最后一个提示，辅助方法位于 /etc/bash_completion.看看里面，阅读每个方法的详细说明，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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