232 lines
8.7 KiB
Bash
232 lines
8.7 KiB
Bash
#!/usr/bin/env bash
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# ------------------------------------------------------------------------------
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# Copyright (c) 2013-2026 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
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# Protected by the BSD3 license. Please read bellow for details.
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#
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# * Redistribution and use in source and binary forms,
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# * with or without modification, are permitted provided
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# * that the following conditions are met:
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# *
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# * Redistributions of source code must retain the above
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# * copyright notice, this list of conditions and the
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# * following disclaimer.
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# *
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# * Redistributions in binary form must reproduce the above
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# * copyright notice, this list of conditions and the following
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# * disclaimer in the documentation and/or other materials
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# * provided with the distribution.
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# *
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# * Neither the name of the copyright holder nor the names
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# * of any other contributors may be used to endorse or
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# * promote products derived from this software without
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# * specific prior written permission.
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# *
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# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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# * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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# * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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# * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# * OF SUCH DAMAGE.
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# ------------------------------------------------------------------------------
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# ------------------------------------------------------------------------------
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# Let the rain fall
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# Usage: rain [OPTIONS]
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# Options:
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# -s, --speed NUM Set the drop delay in seconds (default: 0.050).
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# Lower values = faster rain.
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# -c, --color COLOR Set the color theme (default: white).
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# -h, --help Display this help message and exit.
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# Available Colors:
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# green : The classic Matrix digital rain
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# blue : Deep ocean blue gradients
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# red : Crimson/Blood rain
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# yellow : Amber and gold tones
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# cyan : Electric cyan/turquoise
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# white : Greyscale and white (original style)
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rain()
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{
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show_usage() {
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printf "Usage: rain [OPTIONS]\n"
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printf "Options:\n"
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printf "\t-s, --speed NUM Set the drop delay in seconds (default: 0.050).\n"
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printf "\t Lower values = faster rain.\n"
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printf "\t-c, --color COLOR Set the color theme (default: white).\n"
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printf "\t-h, --help Display this help message and exit.\n\n"
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printf "Available Colors:\n"
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printf "\t\e[32mgreen\e[0m\t: The classic Matrix digital rain\n"
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printf "\t\e[34mblue\e[0m\t: Deep ocean blue gradients\n"
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printf "\t\e[31mred\e[0m\t: Crimson/Blood rain\n"
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printf "\t\e[33myellow\e[0m\t: Amber and gold tones\n"
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printf "\t\e[36mcyan\e[0m\t: Electric cyan/turquoise\n"
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printf "\twhite\t: Greyscale and white (original style)\n\n"
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printf "Example: rain --color green --speed 0.03\n"
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}
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local step_duration=0.050
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local base_color="white" # default color scheme, can be overridden by --color
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# Analyse arguments
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while [[ "$#" -gt 0 ]]; do
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case $1 in
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-s|--speed)
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if [[ -n "$2" && ! "$2" =~ ^- ]]; then
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step_duration="$2"; shift
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else
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disp E "--speed requires a numeric value."
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show_usage && return 1
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fi
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;;
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-c|--color)
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if [[ -n "$2" && ! "$2" =~ ^- ]]; then
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base_color="$2"; shift
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else
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disp E "--color requires a color name."
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show_usage && return 1
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fi
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;;
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-h|--help)
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show_usage && return 0
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;;
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*)
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disp E "Unknown option: $1"
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show_usage && return 1
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;;
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esac
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shift
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done
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# Define colors (256-colors gradients)
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local rain_colors=()
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case $base_color in
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green) # Matrix style green
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for i in {22..28} {34..40} {46..48}; do rain_colors+=("\e[38;5;${i}m"); done ;;
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blue) # Deep ocean blues
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for i in {17..21} {27..33} {39..45}; do rain_colors+=("\e[38;5;${i}m"); done ;;
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red) # Crimson / blood red
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for i in {52..52} {88..88} {124..124} {160..160} {196..201}; do rain_colors+=("\e[38;5;${i}m"); done ;;
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yellow) # Amber / gold
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for i in {58..58} {100..100} {142..142} {184..184} {226..229}; do rain_colors+=("\e[38;5;${i}m"); done ;;
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cyan) # Electric cyan / turquoise
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for i in {30..31} {37..38} {44..45} {50..51}; do rain_colors+=("\e[38;5;${i}m"); done ;;
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*) # Greyscale / white (original style)
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rain_colors=("\e[37m" "\e[37;1m")
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for i in {244..255}; do rain_colors+=("\e[38;5;${i}m"); done ;;
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esac
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local exit_st=0
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local rain_cars=("|" "│" "┃" "┆" "┇" "┊" "┋" "╽" "╿")
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local rain_tab=${#rain_cars[@]}
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local rain_color_tab=${#rain_colors[@]}
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local num_rain_metadata=5
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local term_height=$(tput lines)
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local term_width=$(tput cols)
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local X=0 Y=0 drop_length=0 rain_drop=0
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local max_rain_width=0 new_rain_odd=0 falling_odd=0
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sigwinch() {
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term_width=$(tput cols)
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term_height=$(tput lines)
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#step_duration=0.025
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((max_rain_width = term_width * term_height / 4))
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((max_rain_height = term_height < 10 ? 1 : term_height / 10))
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# In percentage
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((new_rain_odd = term_height > 50 ? 100 : term_height * 2))
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((new_rain_odd = new_rain_odd * 75 / 100))
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((falling_odd = term_height > 25 ? 100 : term_height * 4))
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((falling_odd = falling_odd * 90 / 100))
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}
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do_exit() {
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exit_st=1
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}
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do_render() {
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# Clean screen first
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local idx=0
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for ((idx = 0; idx < num_rains * num_rain_metadata; idx += num_rain_metadata)); do
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X=${rains[idx]}
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Y=${rains[idx + 1]}
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drop_length=${rains[idx + 4]}
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for ((y = Y; y < Y + drop_length; y++)); do
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((y < 1 || y > term_height)) && continue
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echo -ne "\e[${y};${X}H "
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done
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done
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for ((idx = 0; idx < num_rains * num_rain_metadata; idx += num_rain_metadata)); do
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if ((100 * RANDOM / 32768 < falling_odd)); then
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# Falling
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if ((++rains[idx + 1] > term_height)); then
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# Out of screen, bye sweet <3
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rains=("${rains[@]:0:idx}"
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"${rains[@]:idx+num_rain_metadata:num_rains*num_rain_metadata}")
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((num_rains--))
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continue
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fi
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fi
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X=${rains[idx]}
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Y=${rains[idx + 1]}
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rain_drop=${rains[idx + 2]}
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drop_color=${rains[idx + 3]}
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drop_length=${rains[idx + 4]}
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for ((y = Y; y < Y + drop_length; y++)); do
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((y < 1 || y > term_height)) && continue
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printf "\e[${y};${X}H${drop_color}${rain_drop}"
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done
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done
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}
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trap do_exit TERM INT
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trap sigwinch WINCH
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# No echo stdin and hide the cursor
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stty -echo
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printf "\e[?25l"
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printf "\e[2J"
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local rains=()
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local num_rains=0
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sigwinch
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while ((exit_st <= 0)); do
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if (($exit_st <= 0)); then
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read -n 1 -t $step_duration ch
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case "$ch" in
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q | Q)
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do_exit
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;;
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esac
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if ((num_rains < max_rain_width)) && ((100 * RANDOM / 32768 < new_rain_odd)); then
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# Need new |, 1-based
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rain_drop="${rain_cars[rain_tab * RANDOM / 32768]}"
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drop_color="${rain_colors[rain_color_tab * RANDOM / 32768]}"
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drop_length=$((max_rain_height * RANDOM / 32768 + 1))
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X=$((term_width * RANDOM / 32768 + 1))
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Y=$((1 - drop_length))
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rains=("${rains[@]}" "$X" "$Y" "$rain_drop" "$drop_color" "$drop_length")
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((num_rains++))
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fi
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# Let rain fall!
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do_render
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fi
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done
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echo -ne "\e[${term_height};1H\e[0K"
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# Show cursor and echo stdin
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echo -ne "\e[?25h"
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stty echo
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unset exit_st
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trap - TERM INT
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trap - WINCH
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}
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export -f rain
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# ------------------------------------------------------------------------------
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# EOF
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