Slightly optimized version, and with niftier branch indicator

.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_dirty {
  git diff --quiet HEAD &>/dev/null
  [[ $? == 1 ]] && echo "*"
}
function parse_git_branch {
  local branch=$(__git_ps1 "%s")
  [[ $branch ]] && echo "[$branch$(parse_git_dirty)]"
}
export PS1='\u@\h \[\033[1;33m\]\w\[\033[0m\]$(parse_git_branch)$ '