Show Git dirty status in your Unix bash prompt

本文介绍了一种在 Git Bash 中自定义命令行提示符的方法，通过使用颜色代码和 git 状态信息增强用户体验。该方案能够显示当前工作目录是否干净、分支状态以及与远程分支的对比情况。

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http://ambientideas.com/blog/index.php/2010/08/git-bash-prompt/

        RED
=
"/[/033[0;31m/]"

     YELLOW
=
"/[/033[0;33m/]"

 	  GREEN
=
"/[/033[0;32m/]"

       BLUE
=
"/[/033[0;34m/]"

  LIGHT_RED
=
"/[/033[1;31m/]"

LIGHT_GREEN
=
"/[/033[1;32m/]"

      WHITE
=
"/[/033[1;37m/]"

 LIGHT_GRAY
=
"/[/033[0;37m/]"

 COLOR_NONE
=
"/[/e[0m/]"




function 
parse_git_branch {




  git rev-parse --git-dir &> /dev/null
  git_status
=
"$(git status 2> /dev/null)"

  branch_pattern
=
"^# On branch ([^${IFS}]*)"

  remote_pattern
=
"# Your branch is (.*) of"

  diverge_pattern
=
"# Your branch and (.*) have diverged"

  if
 [[
 ! ${
git_status
}
 =
~ "working directory clean"
 ]]
; then

    
state
=
"${RED}⚡"

  fi

  # add an else if or two here if you want to get more specific

  if
 [[
 ${
git_status
}
 =
~ ${
remote_pattern
}
 ]]
; then

    if
 [[
 ${
BASH_REMATCH
[1]
}
 ==
 "ahead"
 ]]
; then

      
remote
=
"${YELLOW}↑"

    else

      
remote
=
"${YELLOW}↓"

    fi

  fi

  if
 [[
 ${
git_status
}
 =
~ ${
diverge_pattern
}
 ]]
; then

    
remote
=
"${YELLOW}↕"

  fi

  if
 [[
 ${
git_status
}
 =
~ ${
branch_pattern
}
 ]]
; then

    
branch
=
${
BASH_REMATCH
[1]
}

    echo
 " (${branch})${remote}${state}"

  fi

}




function 
prompt_func()
 {

    previous_return_value
=
$?
;
    # prompt="${TITLEBAR}$BLUE[$RED/w$GREEN$(__git_ps1)$YELLOW$(git_dirty_flag)$BLUE]$COLOR_NONE "

    prompt
=
"${TITLEBAR}${BLUE}[${RED}/w${GREEN}$(parse_git_branch)${BLUE}]${COLOR_NONE} "

    if 
test
 $previous_return_value
 -eq 0
    then

        
PS1
=
"${prompt}➔ "

    else

        
PS1
=
"${prompt}${RED}➔${COLOR_NONE} "

    fi

}




PROMPT_COMMAND
=
prompt_func