git shell prompt (improved)

gitprompt.sh

#####        GIT PROMPT

        RED="\[\033[0;31m\]"
     YELLOW="\[\033[0;33m\]"
    GREEN="\[\033[0;32m\]"
       BLUE="\[\033[0;34m\]"

  LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
 LIGHT_BLUE="\[\033[1;34m\]"
      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 (.*?) "
  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}[${LIGHT_BLUE}\w${GREEN}$(parse_git_branch)${BLUE}]${COLOR_NONE} "
    if test $previous_return_value -eq 0
    then
                PS1="${WHITE}$(hostname)${COLOR_NONE} ${prompt}${LIGHT_GREEN}>${COLOR_NONE} "
    else
                PS1="${WHITE}$(hostname)${COLOR_NONE} ${prompt}${RED}>${COLOR_NONE} "
    fi
}

PROMPT_COMMAND=prompt_func