git_prompt.sh

        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 __git_diverged {
  git_status="$(git status 2> /dev/null)"
  remote_pattern="# Your branch is (.*) of"
  diverge_pattern="# Your branch and (.*) have diverged"
  # 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
  echo "${remote}"
}

export GIT_PS1_SHOWDIRTYSTATE=1
export GIT_PS1_SHOWSTASHSTATE=1

function prompt_func() {
  previous_return_value=$?
  user="${YELLOW}\u"
  host="${BLUE}\h"
  working_dir="${LIGHT_GRAY}\w"
  host_identifier="${user}${COLOR_NONE}@${host}${COLOR_NONE}:${working_dir}${GREEN}$(__git_ps1)\n" 
  prompt="${host_identifier}${COLOR_NONE} "
  if test $previous_return_value -eq 0
  then
      PS1="${prompt}➔ "
  else
      PS1="${prompt}${RED}➔${COLOR_NONE} "
  fi
}

PROMPT_COMMAND=prompt_func