custom_bash_profile_prompt

# Command prompt formatting
# source this from your .bash_profile

#################################################################################
RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
GREEN="\[\033[0;32m\]"
BLUE="\[\033[0;34m\]"
LIGHT_GREEN="\[\033[1;32m\]"
COLOR_NONE="\[\e[0m\]"


function parse_git_branch {

  git rev-parse --git-dir &> /dev/null
  git_status="$(git status 2> /dev/null)"
  state=""
  if [[ ${git_status} =~ "Changes to be committed:" ]]; then
    state+="s"
  fi
  if [[ ${git_status} =~ "Changes not staged for commit:" ]]; then
    state+="m"
  fi
  if [[ ${git_status} =~ "Untracked files:" ]]; then
    state+="u"
  fi
  if [[ "$state" != "" ]]; then
    state="${RED}["$state"]"
  fi

  remote_pattern="Your branch is (behind|ahead)"
  diverge_pattern="Your branch and (.*) have diverged"
  branch_pattern="^On branch ([^${IFS}]*)"
  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]:0:15}
    echo "(${branch})${remote}${state}"
  fi
}

function prompt_func() {
    previous_return_value=$?;
    if [ -n "${VIRTUAL_ENV:+x}" ]
    then
        #vdir=`basename ${VIRTUAL_ENV}`
        ve="${BLUE}["${VIRTUAL_ENV##*/}"]" #`basename \` dirname ${VIRTUAL_ENV}\``]"
    else
        ve=""
    fi

    prompt="${LIGHT_GREEN}\u@\h:${ve}${BLUE}${YELLOW}\W${GREEN}$(parse_git_branch)${COLOR_NONE}"
    if test $previous_return_value -eq 0
    then
        PS1="${prompt}➔ "
    else
        PS1="${prompt}${RED}➔${COLOR_NONE} "
    fi
}

PROMPT_COMMAND=prompt_func