Custom prompt (left and right) for bash

custom_prompt.bash

RED='\033[0;31m'
YELLOW='\033[0;33m'
LIGHT_GREEN='\033[0;32m'
LIGHT_GRAY='\033[0;37m'
NORMAL='\033[0m'

function prompt_right() {
    echo -e "${LIGHT_GRAY}\\\t${NORMAL}"
}

function prompt_left() {
    GIT_BRANCH=""
    BRANCH=$(git branch 2>/dev/null | grep '^*' | sed s/..//)
    if [ ! -z "$BRANCH" ]; then  GIT_BRANCH=" [${LIGHT_GREEN}${BRANCH}${NORMAL}]"; fi
    echo -e "${YELLOW}\w${NORMAL}${GIT_BRANCH}"
}

function prompt_command() {
    compensate=4
    PS1=$(printf "%*s\r%s\n\$ " "$(($(tput cols)+${compensate}))" "$(prompt_right)" "$(prompt_left)")
}
PROMPT_COMMAND=prompt_command