The ultimate script to indicate git status on PS1

.bashrc

#!/bin/bash
# PS1の設定

C() {
  case $1 in
    black)    echo -e -n "\033[1;30m";;
    red)      echo -e -n "\033[1;31m";;
    green)    echo -e -n "\033[1;32m";;
    yellow)   echo -e -n "\033[1;33m";;
    blue)     echo -e -n "\033[1;34m";;
    magenta)  echo -e -n "\033[1;35m";;
    cyan)     echo -e -n "\033[1;36m";;
    white)    echo -e -n "\033[1;37m";;
    *) echo -e -n "\033[0m";;
  esac
}

ps1_info() {
  local END_CODE=$?
  echo "${USER}@$(hostname -s) $(git-ps)"
  echo "$(date +'%F %H:%M:%S') $(pwd | sed -e "s|^${HOME%/}|~|")"
}

PS1='$(ps1_info)'
# カーソル位置がずれる問題を回避するため、ここの部分だけは文字列連結にする
if [ "$(id -u)" -eq 0 ]; then
  PS1="${PS1}\n\[$(C red)\]#\[$(red)\] " # rootの場合はシャープ
else
  PS1="${PS1}\n\[$(C cyan)\]\$\[$(C reset)\] " # 非rootユーザの場合はドル
fi

export PS1

git-ps.sh

#!/bin/bash
set -euC

C() {
  case $1 in
    black)    echo -e -n "\033[1;30m";;
    red)      echo -e -n "\033[1;31m";;
    green)    echo -e -n "\033[1;32m";;
    yellow)   echo -e -n "\033[1;33m";;
    blue)     echo -e -n "\033[1;34m";;
    magenta)  echo -e -n "\033[1;35m";;
    cyan)     echo -e -n "\033[1;36m";;
    white)    echo -e -n "\033[1;37m";;
    *) echo -e -n "\033[0m";;
  esac
}

status() {
  local modified=0
  local cached=0
  local untracked=0

  while read -r line; do
    if [ "$line" = '_?_?_' ]; then
      untracked=1
      continue
    fi

    if [[ "$line" =~ ^_[^[:space:]]_.?_ ]]; then
      cached=1
    fi

    if [[ "$line" =~ ^_._[^[:space:]]_ ]]; then
      modified=1
    fi
  done < <(git status --short | cut -b -2 | sed -e 's/\(.\)\(.*\)/_\1_\2_/')

  if [ $modified -ne 0 ]; then
    C red
    echo -n 'M'
  fi

  if [ $cached -ne 0 ]; then
    C green
    echo -n 'C'
  fi

  if [ $untracked -ne 0 ]; then
    C red
    echo -n '?'
  fi

  if [ -n "$(git stash list)" ]; then
    C cyan
    echo -n 'S'
  fi
  C reset
}

branch() {
  local branch
  branch="$(git branch 2>/dev/null | grep '^\*' | sed -e "s/^* //")"
  if [[ "${branch}" =~ ^bug- ]]; then
    C green
  elif [[ "${branch}" =~ ^atc- ]]; then
    C cyan
  elif [[ "${branch}" =~ ^tmp ]]; then
    C magenta
  elif [[ "${branch}" = "(detached from hde/master)" ]]; then
    C yellow
  else
    C white
  fi
  echo -n "${branch}"
  C reset
}

hash() {
  git log --pretty=format:'%h' -n 1
}

git_ps() {
  if ! git status --ignore-submodules &>/dev/null; then
    return
  fi
  echo "git[$(status)]=$(branch):$(hash)"
}

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
  git_ps
fi

usage.md

$ wget 

Edit ~/.bashrc or ~/.bash_profile.

Redefine PS1 as following:

export PS1=

@doloopwhile
Hi, Thanks for this script it's fabulous! It took me a little (a lot) of effort to figure out how the script works (and I learned a little - a lot - about bash) but now I've based a section of my PS1 on it.

On my system I had to make one change in lines 25, 30 & 34 and I thought I'd mention it in case anyone else hits the same gotcha.
FROM: untracked=1 :: TO: ((untracked++))

bw
Alex