.bash_ps1

fill="--- "

beutify_ps1() {
  if [ $? = 0 ]; then
      local last_state="${BCYAN}:)${COFF} "
  else
      local last_state="${BRED}:(${COFF} "
  fi

  # create a $fill of all screen width minus the time string and a space
  prefix_str="$USER@$HOSTNAME"
  let fillsize=${COLUMNS}-${#prefix_str}-10
  fill=""
  while [ "$fillsize" -gt "0" ]
  do
      fill="-${fill}" # fill with underscores to work on
      let fillsize=${fillsize}-1
  done

  # indicator treatment
  if [ "${PWD}" = $HOME ]; then
    local indicator="${BASE0}>${COFF} "
  else
    local indicator=" ${BASE0}~>${COFF} "
  fi

  pwd="${BASE0}\w${COFF}"

  git rev-parse --git-dir &> /dev/null
  local git_status="$(git status 2> /dev/null)"
  local branch_pattern="On branch ([^${IFS}]*)"
  local remote_pattern="Your branch is (.*) of"
  local diverge_pattern="Your branch and (.*) have diverged"

  if [[ ! ${git_status} =~ "nothing" ]]; then
    local git_state="${BORANGE}*${COFF}"
  else
    unset git_state
  fi
  if [[ ${git_status} =~ ${remote_pattern} ]]; then
    if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
      local git_remote="${YELLOW}↑${COFF}"
    else
      local git_remote="${YELLOW}↓${COFF}"
    fi
  fi
  if [[ ${git_status} =~ ${diverge_pattern} ]]; then
    local git_remote="${BRED}↕${COFF}"
  else
    unset git_remote
  fi
  if [[ ${git_status} =~ ${branch_pattern} ]]; then
    local git_branch="${BYELLOW}@${COFF}${CYAN}${BASH_REMATCH[1]}${COFF}"
    local git_string="${git_branch}${git_remote}${git_state}"
  fi

  OLD_PS1="${last_state}${pwd}${git_string}${indicator}"
  export PS1="${BASE00}\u@\h "'$fill \t\n'"${COFF}$OLD_PS1"
  # Temporarily comment out the trap DEBUG line due to a Linux specific bug
  # Wait until it get fixed
  # Related forum post: http://gnu-bash.2382.n7.nabble.com/Latest-fix-for-DEBUG-causes-pipes-to-fail-when-used-with-trap-and-an-interactive-shell-td13044.html
  #trap 'echo -ne "\e[0m"' DEBUG # this one is invoked every time before a command is executed
}
PROMPT_COMMAND=beutify_ps1