My version with tweaks and inspiration from holman/dotfiles

.bashrc

# http://henrik.nyh.se/2008/12/git-dirty-prompt
# http://www.simplisticcomplexity.com/2008/03/13/show-your-git-branch-name-in-your-prompt/
#   username@Machine ~/dev/dir[master]$   # clean working directory
#   username@Machine ~/dev/dir[master*]$  # dirty working directory

function parse_git_unpushed {
  local unpushed=`/usr/bin/git cherry -v origin/$(get_git_branch) 2> /dev/null`
  [[ "$unpushed" != "" ]] && echo "$(tput setaf 1) ++> $(tput sgr0)"
}

function parse_git_dirty {
  git diff --quiet HEAD &>/dev/null
  [[ $? == 1 ]] && echo " $(tput bold)$(tput setaf 3)*$(tput sgr0)"
  [[ $(git status --porcelain|grep '^??' 2> /dev/null | tail -n1) != "" ]] && echo -n " $(tput bold)$(tput setaf 5)+$(tput sgr0)"
}

function get_git_branch {
	echo $(__git_ps1 "%s")
}

function parse_git_branch {
  local branch=$(get_git_branch)
  [[ $branch ]] && echo "[$(tput setaf 6)$branch$(tput sgr0)$(parse_git_dirty)]$(parse_git_unpushed)"
}

if [ $(id -u) -eq 0 ];
then # you are root, set red colour prompt
  PS1="\\[$(tput setaf 1)\\]\\u@\\h:\\w #\\[$(tput sgr0)\\]"
else # normal
  PS1='\[$(tput bold ; tput setaf 6)\][\t]\[$(tput setaf 2)\] \u@\h \[$(parse_git_branch)\]\n \[$(tput setaf 4)\]\w \[$(tput sgr0)\]\$ '
fi