Gitifying da prompt

Put in .bash_profile:

function show_git_branch {
  echo -n `git branch --no-color 2> /dev/null | sed -e '/^[^*] /d' -e 's/* \(.*\)/\1/'`
}

function has_local_changes {
  if ! git diff-files --quiet 2> /dev/null; then
    echo -n '*'
  fi
  if ! git diff-index --cached --quiet HEAD 2> /dev/null; then
    echo -n '!'
  fi
}

function has_push {
  HAS=`git rev-list -n 1 HEAD@{upstream}..HEAD 2> /dev/null`
  if [ "$HAS" != "" ]; then
    echo -n '->'
  fi
}

function show_git_info {
  if git rev-parse --git-dir > /dev/null 2>&1; then
    echo -ne "\033[0;32m ("
    show_git_branch
    echo -ne "\033[1;37m"
    has_local_changes
    has_push
    echo -ne "\033[0;32m)"
  fi
}

function proml {
  local LIGHT_BLUE="\[\033[0;94m\]"
  local        RED="\[\033[0;31m\]"
  local      RESET="\[\033[0;0m\]"
  case $TERM in
    xterm*)
    TITLEBAR='\[\033]0;\u@\h:\w\007\]'
    ;;
    *)
    TITLEBAR=""
    ;;
  esac

PS1="${TITLEBAR}\
$LIGHT_BLUE\$(date +%H:%M:%S) \
$RED\u@\h:\w\$(show_git_info) \
$RESET\$ "
PS2='> '
PS4='+ '
}
proml

Original thanks to Chris Wanstrath.