确定PS1中使用的先前颜色

Question

现在我的PS1看起来像这样

我希望“▸”的背景颜色根据最后部分的颜色而改变。因此，如果我不在git repo中，它应该是蓝色，但是当我在git repo中时，黄色。

这是我的.bash_profile中的PS1的样子

# git info on prompt
function __git_info() {
  local -r SYMBOL_GIT_BRANCH="⑂";
  local -r SYMBOL_GIT_MODIFIED="*";
  local -r SYMBOL_GIT_PUSH="↑";
  local -r SYMBOL_GIT_PULL="↓";

  hash git 2>/dev/null || return 0; # git not found

  # current branch reference
  local ref=$(git symbolic-ref --short HEAD 2>/dev/null);

  # if it's not a normal branch name, get tag name or short unique hash
  [[ -z "$ref" ]] && ref=$(git describe --tags --always 2>/dev/null);
  [[ -n "$ref" ]] || return 0;  #not a git repo

  local following; # ahead/behind count
  local modified; # whether something has been modified locally
  local extras; # additional info
  local status; # status of the repo
  local untracked; # whether or not there are untracked files
  local staged; # whether or not there are staged files

  status=$(git status 2>&1 | tee);
  untracked=$(printf "%s" "$status" 2> /dev/null | grep -m 1 "Untracked files" &> /dev/null; printf "%s" "$?");
  staged=$(printf "%s" "$status" 2> /dev/null | grep -m 1 "Changes to be committed" &> /dev/null; printf "%s" "$?");

  [[ "${untracked}" == "0" ]] && extras+="?";
  [[ "${staged}" == "0" ]] && extras+="+";

  # scan first two lines of output from `git status`
  while IFS= read -r line; do
    if [[ $line =~ ^## ]]; then #header line
      [[ $line =~ ahead\ ([0-9]+) ]] && following+="$SYMBOL_GIT_PUSH${BASH_REMATCH[1]}"
      [[ $line =~ behind\ ([0-9]+) ]] && following+="$SYMBOL_GIT_PULL${BASH_REMATCH[1]}"
    else #branch is modified if output contains more lines after the header
      modified=" $SYMBOL_GIT_MODIFIED";
      break;
    fi;
  done < <(git status --porcelain --branch 2>/dev/null);

  # print the git branch segment without a trailing newline
  printf "%s" " [$SYMBOL_GIT_BRANCH$following $ref$modified$extras] ";
}

## Prompt customizations ##
function __host() {
  printf '\[\e[30;102m\] \h \[\e[0m\]';
}

function __dir() {
  printf '\[\e[1;97;44m\] \w \[\e[0m\]';
}

function __git_status() {
  printf "\[\e[30;43m\]\$(__git_info)\[\e[0m\]";
}

function __arrow() {
  printf '\[\e[1;97;44m\] ▸ \[\e[0m\]';
}

export PS1="$(__host)$(__dir)$(__git_status)$(__arrow) "

任何人都知道如何实现这一目标？我尝试设置全局变量，但PS1使用的是子外壳，因此无法使用。

Answer 1

好吧，您的__git_info函数返回一个状态，那么为什么不使用它呢？ （确保ARE是git repo时，确保它返回NON-零。）不要重置函数中的颜色，而是允许它们保持原样并在箭头之后重置它们：

function __dir() {
  printf '\[\e[1;97;44m\] \w ';
}

function __git_status() {
  local info=$(__git_info)
  [ $? -ne 0 ] && printf "\[\e[30;43m\]$info";
}

function __arrow() {
  printf ' ▸ \[\e[0m\]';
}

export PS1="$(__host)$(__dir)$(__git_status)$(__arrow) "