Display Git commit hash and branch name and enable git completions

.bashrc

getGitInfo()
{
    checksum=$(git rev-parse --short HEAD 2> /dev/null)
    branch=$(git symbolic-ref --short HEAD 2> /dev/null)
    if [ ! -z $branch ] && [ ! -z $checksum ]; then
        echo -e " ($branch $checksum)"
    elif [ ! -z $checksum ]; then
        echo -e " ($checksum)"
    elif [ ! -z $branch ]; then
        echo -e " ($branch)"
    fi
}

if [ $EUID == 0 ] ; then
    PS1='\[\033[01;31m\][$? \u@\h\[\033[01;36m\] \w\[\033[01;31m\]]\[\033[01;35m\]$(getGitInfo)\[\033[01;31m\]\$\[\033[00m\] '
else
    PS1='\[\033[01;32m\][$? \u@\h\[\033[01;37m\] \w\[\033[01;32m\]]\[\033[01;35m\]$(getGitInfo)\[\033[01;32m\]\$\[\033[00m\] '
fi

OS=$(uname)
if [ $OS == "Darwin" ]; then
    GIT_COMPLETION_PATH="/Library/Developer/CommandLineTools/usr/share/git-core/git-completion.bash"
    if [[ ! -e $GIT_COMPLETION_PATH ]]; then
        GIT_COMPLETION_PATH="/Applications/Xcode.app/Contents/Developer/usr/share/git-core/git-completion.bash"
    fi
else
    GIT_COMPLETION_PATH="/usr/share/git/completion/git-completion.bash"
fi
[ -r $GIT_COMPLETION_PATH ] && . $GIT_COMPLETION_PATH

Also works git name-rev HEAD --name-only for branch not sure what the difference is.