120 lines
3.9 KiB
Bash
120 lines
3.9 KiB
Bash
# ------------------------------------------------------------------------------
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# Let the rain fall
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# ------------------------------------------------------------------------------
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rain()
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{
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local exit_st=0
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local rain_cars=("|" "│" "┃" "┆" "┇" "┊" "┋" "╽" "╿")
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local rain_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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rain_colors=( "${rain_colors[@]}" "\e[38;5;${i}m" )
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done
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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 step_duration=0.050
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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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echo -ne "\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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echo -ne "\e[?25l"
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echo -ne "\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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