Bash fidget spinner

fidget.sh

# Bash Fidget Spinner
# Could also be included in a bashrc file
fidget() {
  start_time="0.02";
  spin_efficiency="0.99";
  end_time="3";

  time="$start_time";

  printf "\e[92mPress any key to give another spin...\n\n";
  printf "\e[1m";  # Make spinner bold
  printf "\e[91m";  # Make spinner red
  printf "\n\033[1A";  # Make newline, then move back up
  printf "\033[s";  # Save beginning cursor position
  sleep 0.75;

  while true; do
    for X in '-' '/' '|' '\'; do

      # Slow down slightly
      time=`echo "$time/$spin_efficiency" | bc -l`

      printf "\b";

      # if a "push" is detected, make it faster
      read -n1 -s -t $time -p "${X}"
      if [[ $? = 0 ]] ; then
        # This statement is executed if a key press is detected        
        
        printf '\033[K' # Erase to end of line
        printf '\033[10D' # Return cursor to beginning
        printf "\033[u";  # Restore cursor to saved position (failsafe)

        # Reset to full speed
        time=$start_time;
      fi

      # If too slow, exit
      if [[ `echo "$time>$end_time" | bc -l` = 1 ]] ; then
        sleep 1;
        return 0;
      fi

    done;
  done
}

# Remove this line if using in .bashrc
fidget;

That's awesome!