setprompt

#!/bin/sh
# Includes current git branch in tcsh prompt.
#
# EXAMPLE
#
# Your prompt can look like this:
#
#   [myhost.com ~/repos/foo (master)]
#
# USAGE:
#
# 1) Save this script as ~/bin/setprompt
# 2) In .cshrc, include this line:
#
#      alias precmd "source ~/bin/setprompt"
#
# AUTHOR
#
#   Original from http://acts.as.streeteasy.com/archives/2007/12/19/git_in_your_prompt/
#   Modified for tcsh by Geoffrey Grosenbach http://peepcode.com

switch ( `uname` )
	case Darwin:
		set ptail = "»"; breaksw;
	case Linux:
		set ptail = "ϕ"; breaksw;
	default:
		set ptail = "%"; breaksw;
endsw

set color_blue="%{\033[0;34m%}" 
set color_gray="%{\033[1;36m%}" 
set color_normal="%{\033[0m%}" 

setenv GIT_PROMPT  "git status |& git-prompt.awk"

set p1="%B%m%b:%B$color_blue%~${color_normal}%b" 
#set p1="%B%m%b:%B$color_blue%c${color_normal}%b" 
set prompt="${p1}${color_gray}`$GIT_PROMPT`${color_normal} ${ptail} "

Stick this in your .cshrc (for a /bin/tcsh shell) and it should all work:
alias precmd "source ~/bin/setprompt"