train - scripts - random scripts
  HTML git clone https://git.parazyd.org/scripts
   DIR Log
   DIR Files
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       ---
       train (2550B)
       ---
            1 #!/bin/bash
            2 RAINS=("|" "│" "┃" "┆" "┇" "┊" "┋" "╽" "╿")
            3 COLORS=("\e[37m" "\e[37;1m")
            4 # More from 256 color mode
            5 for i in {244..255}; do
            6   COLORS=("${COLORS[@]}" "\e[38;5;${i}m")
            7 done
            8 NRAINS=${#RAINS[@]}
            9 NCOLORS=${#COLORS[@]}
           10 NUM_RAIN_METADATA=5
           11 
           12 
           13 sigwinch() {
           14   TERM_WIDTH=$(tput cols)
           15   TERM_HEIGHT=$(tput lines)
           16   STEP_DURATION=0.025
           17   ((MAX_RAINS = TERM_WIDTH * TERM_HEIGHT / 4))
           18   ((MAX_RAIN_LENGTH = TERM_HEIGHT < 10 ? 1 : TERM_HEIGHT / 10))
           19   # In percentage
           20   ((NEW_RAIN_ODD = TERM_HEIGHT > 50 ? 100 : TERM_HEIGHT * 2))
           21   ((NEW_RAIN_ODD = NEW_RAIN_ODD * 75 / 100))
           22   ((FALLING_ODD = TERM_HEIGHT > 25 ? 100 : TERM_HEIGHT * 4))
           23   ((FALLING_ODD = FALLING_ODD * 90 / 100))
           24   }
           25 
           26 do_exit() {
           27   echo -ne "\e[${TERM_HEIGHT};1H\e[0K"
           28 
           29   # Show cursor and echo stdin
           30   echo -ne "\e[?25h"
           31   stty echo
           32   exit 0
           33   }
           34 
           35 do_render() {
           36   # Clean screen first
           37   for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
           38     X=${rains[idx]}
           39     Y=${rains[idx + 1]}
           40     LENGTH=${rains[idx + 4]}
           41     for ((y = Y; y < Y + LENGTH; y++)); do
           42       (( y < 1 || y > TERM_HEIGHT )) && continue
           43       echo -ne "\e[${y};${X}H "
           44     done
           45   done
           46 
           47   for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
           48     if ((100 * RANDOM / 32768 < FALLING_ODD)); then
           49       # Falling
           50       if ((++rains[idx + 1] > TERM_HEIGHT)); then
           51         # Out of screen, bye sweet <3
           52         rains=("${rains[@]:0:idx}"
           53                "${rains[@]:idx+NUM_RAIN_METADATA:num_rains*NUM_RAIN_METADATA}")
           54         ((num_rains--))
           55         continue
           56       fi
           57     fi
           58     X=${rains[idx]}
           59     Y=${rains[idx + 1]}
           60     RAIN=${rains[idx + 2]}
           61     COLOR=${rains[idx + 3]}
           62     LENGTH=${rains[idx + 4]}
           63     for ((y = Y; y < Y + LENGTH; y++)); do
           64       (( y < 1 || y > TERM_HEIGHT )) && continue
           65       echo -ne "\e[${y};${X}H${COLOR}${RAIN}"
           66     done
           67   done
           68   }
           69 
           70 trap do_exit TERM INT
           71 trap sigwinch WINCH
           72 # no echo stdin and hide the cursor
           73 stty -echo
           74 echo -ne "\e[?25l"
           75 
           76 echo -ne "\e[2J"
           77 rains=()
           78 sigwinch
           79 while :; do
           80   read -n 1 -t $STEP_DURATION ch
           81   case "$ch" in
           82     q|Q)
           83       do_exit
           84       ;;
           85   esac
           86 
           87   if ((num_rains < MAX_RAINS)) && ((100 * RANDOM / 32768 < NEW_RAIN_ODD)); then
           88     # Need new |, 1-based
           89     RAIN="${RAINS[NRAINS * RANDOM / 32768]}"
           90     COLOR="${COLORS[NCOLORS * RANDOM / 32768]}"
           91     LENGTH=$((MAX_RAIN_LENGTH * RANDOM / 32768 + 1))
           92     X=$((TERM_WIDTH * RANDOM / 32768 + 1))
           93     Y=$((1 - LENGTH))
           94     rains=("${rains[@]}" "$X" "$Y" "$RAIN" "$COLOR" "$LENGTH")
           95     ((num_rains++))
           96   fi
           97 
           98   # let rain fall!
           99   do_render
          100 done