bashrc_增加git信息显示

~/.bashrc 或者 ~/.bash_profile

function parse_git_dirty {
    local git_status=$(git status 2> /dev/null);
    local git_now="";
    local changes_file_num=0;
    local untracked_file_num=0;

    if [[ "${git_status}" =~ "nothing to commit, working tree clean" ]]; then
        git_now="=";  # 与远端一致
        changes_file_num=$( git diff --cached --name-only 2> /dev/null | wc -l | tr -d ' ' )
    elif [[ "${git_status}" =~ "Changes not staged for commit" ]]; then
        git_now='*';  # 有修改的文件
        changes_file_num=$( git diff --name-only 2> /dev/null | wc -l | tr -d ' ' )
        untracked_file_num=$( cd $( git rev-parse --show-toplevel ); git ls-files --others --exclude-standard 2> /dev/null | wc -l | tr -d ' '  )
        changes_file_num=$(( ${changes_file_num} + ${untracked_file_num} ))
    elif [[ "${git_status}" =~ "Changes to be committed" ]]; then
        git_now='~';  # [有要提交的文件]
        changes_file_num=$( git diff --cached --name-only 2> /dev/null | wc -l | tr -d ' ' )
    elif [[ "${git_status}" =~ "Untracked files" ]]; then
        git_now="+";  # [存在改动的文件]
        changes_file_num=$( git diff --name-only 2> /dev/null | wc -l | tr -d ' ' )
        untracked_file_num=$( cd $( git rev-parse --show-toplevel ); git ls-files --others --exclude-standard 2> /dev/null | wc -l | tr -d ' '  )
        changes_file_num=$(( ${changes_file_num} + ${untracked_file_num} ))
    else
        git_now="";
    fi
    #echo "(${git_now}[${changes_file_num}])";
    echo "(${git_now}[${changes_file_num}])";
}
function git_branch()
{
    branch=`git rev-parse --abbrev-ref HEAD 2>/dev/null`
    if [ "${branch}" != "" ]
    then
        if [ "${branch}" = "(no branch)" ]
        then
            branch="(`git rev-parse --short HEAD`...)"
        fi
        #echo "☛ $branch($(parse_git_dirty))"
        #echo "⎇ $branch ($(parse_git_dirty))"
        echo "$branch"
    fi
}

function prompt_command {
    PS1="\n\[\033[01;36m\][\u@\h\[\033[01;32m\] \w\[\033[01;36m\]]\[\033[01;36m\] ⎇ \[\033[01;33m\]$(git_branch) \[\033[01;31m\]$(parse_git_dirty)\[\033[00m\]\n\\$\[\033[00m\] "                                   
}

PROMPT_COMMAND=prompt_command

备注

经过测试: 
PROMPT_COMMAND=prompt_command
此命令MAC、Linux都适用