Show git branch in prompt

.bash_profile

# mac git bash completion
source /usr/local/git/contrib/completion/git-completion.bash 

# lucid git bash completion
# source /etc/bash_completion.d/git-completion.bash

GIT_PS1_SHOWDIRTYSTATE="."
GIT_PS1_SHOWUNTRACKEDFILES="."
GIT_PS1_SHOWSTASHSTATE="."
GIT_PS1_SHOWUPSTREAM="auto"

BLACK=$(tput setaf 0)
RED=$(tput setaf 1)
GREEN=$(tput setaf 2)
YELLOW=$(tput setaf 3)
LIME_YELLOW=$(tput setaf 190)
POWDER_BLUE=$(tput setaf 153)
BLUE=$(tput setaf 4)
MAGENTA=$(tput setaf 5)
CYAN=$(tput setaf 6)
WHITE=$(tput setaf 7)
BRIGHT=$(tput bold)
NORMAL=$(tput sgr0)
BLINK=$(tput blink)
REVERSE=$(tput smso)
UNDERLINE=$(tput smul)

function set_prefix {
    BRANCH=`__git_ps1`
    if [[ -z $BRANCH ]]; then
        echo "${NORMAL}$"
    else
        echo "${UNDERLINE}+"
    fi
}

export TERM=xterm-color

PS1='\[${RED}\u@${RED}\h${WHITE} in ${GREEN}\w${WHITE}`__git_ps1 " on ${YELLOW}%s"`${WHITE}\r\n\]\[`set_prefix`\]\[${NORMAL}${WHITE}\] '