#!/bin/bash

#set chess cell's width
read -p "Please set the chess cell's width( two space width as unit ):" width
if [[ $width =~ "^[0-9]+$" ]];then
 echo "wrong width setting, check your input and try again."
 exit
fi
let width=$width*2

#choose player's board cell color
player="player1"
PS3="Which color do you want to set for $player :"
select choice in red green yellow blue purple cyan white;do
 case $REPLY in
 [1-7])
 if [[ $player == player2 ]];then
  declare -i color2=$REPLY
  break
 else
  declare -i color1=$REPLY
 fi
 player="player2"
 PS3="Which color do you want to set for $player :"
 ;;
 *)
 ;;
 esac
done
if (( color1==color2 ));then
 echo "two player must choose different color, check your choice and try again."
 exit
fi

#print the chess board
for (( i=0; i4; i++ )); do
 for (( j=0; j$width/2; j++ ));do
 for (( k=0; k4; k++ ));do
  echo -e "\e[4${color1}m$(printf %${width}s)\e[0m\c"
  echo -e "\e[4${color2}m$(printf %${width}s)\e[0m\c"
 done
 echo
 done
 for (( j=0; j$width/2; j++ ));do
 for (( k=0; k4; k++ ));do
  echo -e "\e[4${color2}m$(printf %${width}s)\e[0m\c"
  echo -e "\e[4${color1}m$(printf %${width}s)\e[0m\c"
 done
 echo
 done
done