优化bash

echo $PS1

# 添加$(git_prompt)到PS1
function git_prompt() {
    git rev-parse --is-inside-work-tree &>/dev/null || return

    branch=$(git symbolic-ref --short HEAD 2>/dev/null || git rev-parse --short HEAD)
    is_detached=! git symbolic-ref -q HEAD &>/dev/null
    has_changes=! git diff --quiet &>/dev/null && echo "*"

    if [ "$1" == "color" ]; then
        # 颜色定义
        RED="\[\e[31m\]"
        GREEN="\[\e[32m\]"
        YELLOW="\[\e[33m\]"
        CYAN="\[\e[36m\]"
        RESET="\[\e[0m\]"

        # 状态判断
        if $is_detached && [ -n "$has_changes" ]; then
            color=$YELLOW
        elif $is_detached; then
            color=$CYAN
        elif [ -n "$has_changes" ]; then
            color=$YELLOW
        else
            color=$GREEN
        fi

        echo " ${color}${branch}${has_changes}${RESET}"
    else
        echo " ${branch}${has_changes}"
    fi
}

GIT_PROMPT=$(git_prompt color)
END_PROMPT="\r\n❯ "