scripts/christmas.sh

   1 #!/bin/bash
   2
   3 LINES=$(tput lines)
   4 COLUMNS=$(tput cols)
   5
   6 declare -A snowflakes
   7 declare -A lastflakes
   8
   9 clear
  10
  11 function move_flake() {
  12     i="$1"
  13
  14     if [ "${snowflakes[$i]}" = "" ] || [ "${snowflakes[$i]}" = "$LINES" ]; then
  15         snowflakes[$i]=0
  16     else
  17         if [ "${lastflakes[$i]}" != "" ]; then
  18             printf "\033[%s;%sH \033[1;1H " ${lastflakes[$i]} $i
  19         fi
  20     fi
  21
  22     printf "\033[%s;%sH\u274$[($RANDOM%6)+3]\033[1;1H" ${snowflakes[$i]} $i
  23
  24     lastflakes[$i]=${snowflakes[$i]}
  25     snowflakes[$i]=$((${snowflakes[$i]}+1))
  26 }
  27
  28 while :
  29 do
  30     i=$(($RANDOM % $COLUMNS))
  31
  32     move_flake $i
  33
  34     for x in "${!lastflakes[@]}"
  35     do
  36         move_flake "$x"
  37     done
  38
  39     sleep 0.1
  40 done