My bash prompt

.bash_profile_prompt.sh

RESET="\[\017\]"
NORMAL="\[\033[0m\]"
YELLOW="\[\033[33;1m\]"

function colour256() {
    echo "\[\033[38\;5\;$1m\]";
}

# Alternative to \W. \W works in $PS1, but bash can not interpret it
function pwdbn() {
    if [ "`pwd`" == "$HOME" ]; then echo "~"; else basename "`pwd`"; fi
}

# Function to generate prompt.
# Params are:
#  $1 = Successful prompt colour
#  $2 = Unsuccessul prompt colour
#  $3 = GIT branch colour
# Don't specify params for plain no colour prompt
function prompt() {
    # Must be first line in function to detect if last command was successful
    if [ $? = 0 ]; then COLOUR_BN=$1; else COLOUR_BN=$2; fi
    BASENAME=`pwdbn`

    git branch &>/dev/null
    if [ $? = 0 ]; then
    	BRANCH=" (`git rev-parse --symbolic-full-name --abbrev-ref HEAD 2> /dev/null`)"
    fi

    echo "${COLOUR_BN}${BASENAME}${3}${BRANCH}"
}

function prompt_symbol() {
    if [ "`whoami`" == "root" ]; then echo '#'; else echo '$'; fi
}

# Throw it all together
PS1=" ${RESET}\`prompt $(colour256 40) $(colour256 52) $NORMAL\` ${YELLOW}`prompt_symbol` ${NORMAL}"
PS2=" \`prompt | sed 's/./ /g'\` ${YELLOW}… ${NORMAL}"