PS1 定义中的条件密码

Question

我想在我的提示中显示 当前工作目录 ，如果我在 symlink 与不在

我已经做到了：

[[ `pwd -P` = `pwd` ]] && echo "\[1;31m\]$(pwd -P)" || echo "\[1;32m\]$(pwd)"

将 return 获得所需的输出，但它不能替代命令提示符中的 \w。

我尝试用反引号将其包装起来，但这只会导致 PS1.

中的 pwd -Ppwd

我想有条件地更改颜色和值，如果它是 symlink 或不是，这就是为什么我想要 if/else 类型的决定。

Answer 1

如果您希望它实际上高效（并提示应该快速渲染！），那么您需要缓存物理查找，并使用 $PWD 而不是 $(pwd) 进行逻辑查找。

# global variables are prefixed with funcname__ to avoid conflicts

# look up color codes for our terminal rather than assuming ANSI
set_prompt__red=$(tput setaf 1)
set_prompt__green=$(tput setaf 2)
set_prompt__reset=$(tput sgr0)

set_prompt() {

  # only rerun this code when changing directories!
  if [[ $set_prompt__lastPWDl != "$PWD" ]]; then
    set_prompt__lastPWDl=$PWD
    set_prompt__lastPWDp=$(pwd -P)
    if [[ "$set_prompt__lastPWDl" = "$set_prompt__lastPWDp" ]]; then
      set_prompt__pwd_color="$set_prompt__red"
    else
      set_prompt__pwd_color="$set_prompt__green"
    fi
  fi

  # ...actually could have just "return"ed above, but this way we can change other
  # aspects of the prompt even when we don't need to do a new directory lookup.
  PS1='...whatever prefix...'
  PS1+="\[${set_prompt__pwd_color}\]${PWD}\[${set_prompt__reset}\]"
  PS1+='...whatever suffix...'
}
PROMPT_COMMAND=set_prompt

Answer 2

这就是我最终得到的结果：

我想更改 pwd 值以及 symlink 时的颜色。

# look up color codes for our terminal rather than assuming ANSI
declare -r red=$(tput setaf 1)
declare -r green=$(tput setaf 2)
declare -r white=$(tput setaf 9)
declare -r aqua=$(tput setaf 6)
declare -r reset=$(tput sgr0)

colorize_msg() {
   printf -v  "\[%s\]%s"  
}

set_prompt() {

    declare prompt_pwd=""
    # only rerun this code when changing directories!
    if [[ last_prompt_pwdL != $PWD ]]; then
        declare -g last_prompt_pwdL=$PWD # logical path
        declare -r last_prompt_pwdP=$(pwd -P) # physical path
        if [[ $last_prompt_pwdL = $last_prompt_pwdP ]]; then
          colorize_msg prompt_pwd $green $last_prompt_pwdL
        else
          colorize_msg prompt_pwd $red $last_prompt_pwdP
        fi

        # ...actually could have just "return"ed above, but this way we can change other
        # aspects of the prompt even when we don't need to do a new directory lookup.
        declare prompt=""
        declare msg=""
        colorize_msg msg $white "["
        prompt+=$msg
        colorize_msg msg $aqua "\u"
        prompt+=$msg
        colorize_msg msg $red "@"
        prompt+=$msg
        colorize_msg msg $aqua"\h"
        prompt+=$msg
        colorize_msg msg $white "] ["
        prompt+=$msg
        prompt+=${prompt_pwd}
        colorize_msg msg $white "]"
        prompt+=$msg
        prompt+="${reset}\n"
        PS1=$prompt
    fi
}

PS1 定义中的条件密码

Conditional pwd in an PS1 definition

bash

ps1

这就是我最终得到的结果：