Colored bash prompt with git information (tested on OSX 10.9)

.bashrc

# for ANSI color codes see e.g. http://bitmote.com/index.php?post/2012/11/19/Using-ANSI-Color-Codes-to-Colorize-Your-Bash-Prompt-on-Linux

parse_exit_code() {
# check exit code and display a green checkmark on "0" or a red cross with exit code on error
	if [ "$?" == "0" ]; then
		echo -e "\033[32m✓\033[00m"
	else
		echo -e "\033[1;31m❌  $?\033[00m"
	fi
}

parse_user() {
# check if the user is root, then display "#", else "$"
	if [ ${EUID} -eq 0 ]; then echo '#'; else echo '$'; fi
}

parse_git_status() {
# if the current path is a git repository, display "±"; red if changed, green if clean
  local STATUS=`git status 2>&1`
  if [[ "$STATUS" != *'Not a git repository'* ]]; then
    if [[ "$STATUS" == *'working directory clean'* ]]; then
      echo -e "\033[0;32m±\033[00m"
    else
      echo -e "\033[0;31m±\033[00m"
    fi
  fi
}

parse_git_branch() {
# display current git branch, if any; * if ???, # if ???, + if changed
    in_wd="$(git rev-parse --is-inside-work-tree 2>/dev/null)" || return
    test "$in_wd" = true || return
    state=''
    git update-index --refresh -q >/dev/null # avoid false positives with diff-index
    if git rev-parse --verify HEAD >/dev/null 2>&1; then
        git diff-index HEAD --quiet 2>/dev/null || state='*'
    else
        state='#'
    fi
    (
        d="$(git rev-parse --show-cdup)" &&
        cd "$d" &&
        test -z "$(git ls-files --others --exclude-standard .)"
    ) >/dev/null 2>&1 || state="${state}+"
    branch="$(git symbolic-ref HEAD 2>/dev/null)"
    test -z "$branch" && branch='<detached-HEAD>'
    echo -e "\033[37m${branch#refs/heads/} ${state}\033[00m"
}

# use bracket quoting for color codes, otherwise readline miscalculates line length
PS1='$(parse_exit_code) $(parse_git_status) $(parse_git_branch)\n\[\033[1;32m\]\u@\h\[\033[00m\]:\[\033[1;34m\]\w\[\033[00m\] $(parse_user) '