No-dependencies lolcat equivalent for use in Windows + Git Bash (meow is really slow!)

lolcat.sh

# add to your .bash_profile
lolcat() {
  awk -v seed="$RANDOM" '
    BEGIN {
        PI = 3.14159
        f = 0.04 # <-- DECREASE to stretch the wave
        p1 = 0; p2 = 2 * PI / 3; p3 = 4 * PI / 3 
        line_idx = seed  # <--- Starts at a totally random spot in the rainbow
    }
    {
        for (i = 1; i <= length($0); i++) {
            c = substr($0, i, 1)
            idx = line_idx + (i * 0.4)  # <-- DECREASE for wider horizontal spread
            r = int(sin(f * idx + p1) * 127 + 128)
            g = int(sin(f * idx + p2) * 127 + 128)
            b = int(sin(f * idx + p3) * 127 + 128)
            printf "\033[38;2;%d;%d;%dm%s", r, g, b, c
        }
        printf "\033[0m\n"
        line_idx += 1.5  # <-- Optional: Controls vertical tilt (lower = more horizontal)
    }' "$@"
}