random/wave

#!/bin/bash
# wave egenrator - developed by acidvegas (https://git.acid.vegas)

random_color() {
    echo $((RANDOM % 256))
}

rainbow_color() {
    local index="$1"
    local colors=("196" "202" "208" "214" "220" "226" "190" "154" "118" "82" "46" "47" "48" "49" "50" "51" "45" "39" "33" "27" "21" "57" "93" "129" "165" "201")
    echo "${colors[index % ${#colors[@]}]}"
}

print_wave() {
    local chars="$1"
    local len="$2"
    local delay="$3"
    local color_mode="$4"
    local pulse_mode="$5"
    local color_idx=0

    while :; do
        printf "\r"
        for ((i = 0; i < len; i++)); do
            if [ "$color_mode" == "rainbow" ]; then
                color="\033[38;5;$(rainbow_color "$color_idx")m"
            elif [ "$color_mode" == "chaos" ]; then
                color="\033[38;5;$(random_color)m"
            else
                color=""
            fi

            char="${chars:i:1}"
            if [ "$pulse_mode" == "on" ]; then
                if [ $((RANDOM % 2)) -eq 0 ]; then
                    char="${chars:i+1:1}"
                else
                    char="${chars:i-1:1}"
                fi
            fi

            printf "$color$char"
            color_idx=$((color_idx + 1))
        done

        sleep "$delay"

        chars="${chars: -1}${chars%?}"
    done
}

length="${1:-15}"
delay="${2:-0.05}"
color_mode="none"
pulse_mode="off"

if [ "$3" == "-r" ]; then
    color_mode="rainbow"
elif [ "$3" == "-c" ]; then
    color_mode="chaos"
elif [ "$3" == "-p" ]; then
    pulse_mode="on"
fi

wave_chars="▁▂▃▄▅▆▇█▇▆▅▄▃▂▁"
wave_chars="$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars$wave_chars"
print_wave "$wave_chars" "$length" "$delay" "$color_mode" "$pulse_mode"