Custom BASH prompt including username, working directory, git branch and status on one line; followed by a simple prompt that reflects the exit status of the last command.

.bash_profile

source /usr/local/etc/bash_completion.d/git-prompt.sh

function parse_git_dirty {
  local retval=$?
  [[ $(git status 2> /dev/null | tail -n1) != "" && $(git status 2> /dev/null | tail -n1) != "nothing to commit, working directory clean" ]] && echo "*"
  return $retval
}
 
function parse_git_branch {
  local retval=$?
  echo -e "$(__git_ps1)"
  return $retval
}

export PS1="\n\u: \w [\[\033[1;35m\]\$(~/.rvm/bin/rvm-prompt i v g)\[\033[0m\]]\[\e[01;36m\]\$(parse_git_branch)\[\e[01;33m\]\$(parse_git_dirty)\n\`if [ \$? = 0 ]; then echo -e '\[\e[01;32m\]\xE2\x9C\x94'; else echo -e '\[\e[01;31m\]\xE2\x9C\x98'; fi\`\[\e[00m\] "
export PS2="\`echo -e '\xE2\x9E\x94'\` "