Wild asian ping pong in the wild

wildpingpong.sh

#!/bin/bash -ue
# ANIMATE them wild asian ping pong players
# chr.bryn@gmail.com

# Q( - _-)_____¦___o__Q(-_ - )

court_length=12
speed="0.3"
colors="false"
clear="false"

function print_usage() {
  cat <<EOF
Wild asian ping pong players. Kill with ctrl+c
Usage: ${0} [-h|-l <court length>|-s <speed>]
  -c  Colors!
  -C  Clear screen before starting match
  -h  Haalp
  -l  Court length. Default: ${court_length}
  -s  Speed, or how long to sleep between 'frames'. Default: ${speed}

Examples:
  ${0} -c -l 8 -s 0.1
  ${0} -C -c -l 50 -s 0.02
EOF
}

while getopts cChl:s: o
do
  case $o in
    c)
      colors="true" ;;
    C)
      clear="true" ;;
    h)
      print_usage ; exit ;;
    l)
      court_length=$OPTARG ;;
    s)
      speed=$OPTARG ;;
  esac
done
shift $(($OPTIND-1))

# XXX: more fancy color stuff
if [ "${colors}" == "true" ]; then
  if (which tput >/dev/null); then
    ldude="$(tput setaf 4)Q$(tput setaf 3)( - _-)$(tput sgr0)"
    rdude="$(tput setaf 6)Q$(tput setaf 3)(-_ - )$(tput sgr0)"
    ball="$(tput setaf 2)o$(tput sgr0)"
  else
    # my android has not tput or whatever dude
    green='\e[0;32m'
    blue='\e[0;34m'
    yellow='\e[0;33m'
    cyan='\e[0;36m'
    reset='\e[0m'
    ldude="${blue}Q${yellow}( - _-)${reset}"
    rdude="${cyan}Q${yellow}(-_ - )${reset}"
    ball="${green}o${reset}"
  fi
else
  ldude="Q( - _-)"
  rdude="Q(-_ - )"
  ball="o"
fi
#court=(_ _ _ _ _ ¦ _ _ _ _ _ _)
declare -a court
[ ${court_length} -lt 2 ] && let court_length=2
net_pos=$((${court_length}/2))
# if even number add one as one is lost to the net
[ $(( ${court_length} % 2 )) -eq 0 ] && let court_length+=1
for (( i=0 ; i < ${court_length};i++)); do court+=(_); done
court[$net_pos]="|"

[ "${clear}" == "true" ] && clear

# disable the cursor
if ( which setterm >/dev/null); then
  trap "setterm -cursor on || true" EXIT
  setterm -cursor off || true
else
  # try using shell escape codes - works just as good as setterm if supported.
  trap 'printf "\033[?12l\033[?25h"' EXIT
  printf "\033[?25l"
fi

pos=0
#op='+=1'
op='++'
while :; do 
  acourt=""
  #c=(${court[@]})
  #c[$pos]="${ball}"
  # fix this court generation thingy, it suxx:
  #for i in ${c[@]}; do acourt="${acourt}${i}"; done
  #for (( i=0 ; i < ${#court[@]} ; i++ )); do a="${court[$i]}" ; [ $i -eq $pos ] && a="${ball}" ; acourt="${acourt}${a}" ; done
  # humm - something weird with escape codes. echo -e -n prints fine, printf needs some extra help ... ?
  for (( i=0 ; i < ${#court[@]} ; i++ )); do a="${court[$i]}" ; [ $i -eq $pos ] && a="$( printf '%0b%s' ${ball} )" ; acourt="${acourt}${a}" ; done
  printf "%0b%s%0b%s%0b%s" "${ldude}" "${acourt}" "${rdude}"
  #echo -n -e "${ldude}${acourt}${rdude}"
  [ $pos -eq 0 ] && op='+=1'
  [ $pos -eq $(($court_length-1)) ] && op='--'
  let pos${op}
  # flush screen
  sleep ${speed} ; printf '\r'
done