100 lines
2.5 KiB
Plaintext
100 lines
2.5 KiB
Plaintext
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#!/bin/bash
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RAINS=("|" "│" "┃" "┆" "┇" "┊" "┋" "╽" "╿")
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COLORS=("\e[37m" "\e[37;1m")
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# More from 256 color mode
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for i in {244..255}; do
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COLORS=("${COLORS[@]}" "\e[38;5;${i}m")
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done
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NRAINS=${#RAINS[@]}
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NCOLORS=${#COLORS[@]}
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NUM_RAIN_METADATA=5
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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_RAINS = TERM_WIDTH * TERM_HEIGHT / 4))
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((MAX_RAIN_LENGTH = 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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echo -ne "\e[${TERM_HEIGHT};1H\e[0K"
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# Show cursor and echo stdin
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echo -ne "\e[?25h"
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stty echo
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exit 0
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}
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do_render() {
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# Clean screen first
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for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
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X=${rains[idx]}
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Y=${rains[idx + 1]}
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LENGTH=${rains[idx + 4]}
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for ((y = Y; y < Y + 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=${rains[idx + 2]}
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COLOR=${rains[idx + 3]}
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LENGTH=${rains[idx + 4]}
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for ((y = Y; y < Y + LENGTH; y++)); do
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(( y < 1 || y > TERM_HEIGHT )) && continue
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echo -ne "\e[${y};${X}H${COLOR}${RAIN}"
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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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echo -ne "\e[?25l"
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echo -ne "\e[2J"
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rains=()
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sigwinch
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while :; do
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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_RAINS)) && ((100 * RANDOM / 32768 < NEW_RAIN_ODD)); then
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# Need new |, 1-based
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RAIN="${RAINS[NRAINS * RANDOM / 32768]}"
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COLOR="${COLORS[NCOLORS * RANDOM / 32768]}"
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LENGTH=$((MAX_RAIN_LENGTH * RANDOM / 32768 + 1))
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X=$((TERM_WIDTH * RANDOM / 32768 + 1))
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Y=$((1 - LENGTH))
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rains=("${rains[@]}" "$X" "$Y" "$RAIN" "$COLOR" "$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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done
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