Git branch and dirty state in Bash prompt.

.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 status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo "*"
}
# also add a + if the local branch is ahead of remote
function parse_git_branch_ahead {
  [[ $(git status 2> /dev/null | grep 'Your branch is ahead of') ]] && echo '+'
}
function parse_git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/[\1$(parse_git_dirty)$(parse_git_branch_ahead)]/"
}
export PS1='\u@\h \[\033[1;33m\]\w\[\033[0m\]$(parse_git_branch)$ '