parse_git function in bash which updates your prompt with the git branch if it is a git repo

parse_git.sh

function parse_git_dirty {
  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit, working tree clean" ]] && echo "*"
}
function parse_git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/(\1$(parse_git_dirty))/"
}

export PS1='\u@\h \[\033[1;33m\]\w\[\033[0m\]$(parse_git_branch)$ '

#grey
PS1='\[\033[0;32m\]\u\[\033[1;32m\]@\[\033[0;32m\]\h\[\033[00m\]:\[\033[01;34m\]\W\[\033[1;30m\]$(parse_git_branch)\[\033[00m\]\$ '

my prompt looks like

mattions@triton:Neuronvisio(master)$

Current branch can be determined also using: git symbolic-ref HEAD. Seems a bit cleaner to me. :-)

Yeah, that could be an option as well!
TBH, I hacked this long time ago from pieces found on Internet and tries and error with the regex !

Note:
On the last version of git (git version 1.8.1.2) you need to change the line:

"nothing to commit (working directory clean)" 

to

"nothing to commit, working directory clean"