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 green
#   username@Machine ~/dev/dir [master*]$  # dirty working directory red*
#
function git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'
}
# http://unix.stackexchange.com/questions/88307/escape-sequences-with-echo-e-in-different-shells
function markup_git_branch {
  if [[ "x$1" = "x" ]]; then
    echo -e "[$1]"
  else
    if [[ $(git status 2> /dev/null | tail -n1) = "nothing to commit, working directory clean" ]]; then
      echo -e '\033[1;32m['"$1"']\033[0;30m'
    else
      echo -e '\033[1;31m['"$1"'*]\033[0;30m'
    fi
  fi
}
export PS1='\u@\h \[\033[0;34m\]\w\[\033[0m\] $(markup_git_branch $(git_branch))$ '

Kudos to @srguiwiz for the original code and also to @jcgoble3 for imrpoving on it further.
I also made few changes to suite my need. I wanted to maintain the system color, show a different color (red) for master branch and white all other branches. If the status is "dirty", the font should become italic and blinking. With this little tweak, I had to folk @jcgoble3 code and can be found here.