#!/usr/bin/env bash

# ensure COLUMNS is set
# stty size > /dev/null

COLUMNS=$(tput cols)
# delay for wezterm to learn it's size
sleep 0.2

line() {
	i=1
	while [[ $i -le $COLUMNS ]]; do
		echo -en "\u258$((RANDOM % 8 + 1))"
		i=$((i + 1))
	done
}
echo
awk -v columns="$COLUMNS" -v s="$(line)" \
	'BEGIN{
    for (colnum = 0; colnum<columns+1; colnum++) {
        r = 255-(colnum*255/columns);
        g = (colnum*510/columns);
        b = (colnum*255/columns);
        if (g>255) g = 510-g;
        printf "\033[38;2;%d;%d;%dm", r,g,b;
        printf "%s\033[0m", substr(s,colnum+1,1);
    }
    printf "\n";
}'