There are many tricks out there to get the git status to show in the command line path, but here’s one that worked the best for me on a Mac OS X Snow Leopard machine.

Download the git tarball, and find the contrib/completion/git-completion.bash file. Move it to a good location on your system. In my situation I went with:

/opt/local/etc/bash_completion.d/git-completion

Import that code into your .bash_profile and then add in the code necessary to append the branch name output:

. /opt/local/etc/bash_completion.d/git-completion
PS1='\h:\W$(__git_ps1 "(%s)") \u\$ '

You’re done. If you’re getting the “command not found” error after restarting the terminal, be sure your completion file is in the right spot.

If you want to color things a bit, you could change it to one of the options below:

RED="\[\033[0;31m\]"
GREEN="\[\033[0;32m\]"
YELLOW="\[\033[0;33m\]"
BLUE="\[\033[0;34m\]"
PURPLE="\[\033[0;35m\]"
TEAL="\[\033[0;36m\]"
GRAY="\[\033[0;37m\]"
WHITE="\[\033[0;38m\]"
PS1="$TEAL\h: $GRAY\W$GREEN \$(__git_ps1 '(%s)')$WHITE \$ "


A ton of different ways can be found here:
http://asemanfar.com/Current-Git-Branch-in-Bash-Prompt