#!/bin/bash
# Chessclock
#
#
#	Variables
#
	white=0		# Time of white player
	black=0 	# Time of black player
	cur=white	# White begings always
#	intervall=1	# Default intervall
	isPaused=true	# If the game is paused (or just not started yet) and neither one makes a move
#
#	Action & Display
#
	while true
	do	# Do math while players are playing....
		if $isPaused
		then	# Noone plays at the moment
			echo -e "\rGame is paused, press 'b' to beginn/resume"
			read -n1 input
			[[ $input = b ]] && isPaused=false
		else	# Get current players time:
			case $cur in
			black)	black=$(($black+1))
				time=$black		;;
			white)	white=$(($white+1))
				time=$white		;;
			esac
		fi
		
		echo -e "\rActive Player ($cur): ${time} secs"
		#sleep $intervall
		read -n1 -t1 input
		case $input in
		b|B)	# Beginn
			isPaused=false
			;;
		e|E)	# Exit
			break
			;;
		p|P)	# Pause
			isPaused=true
			;;
		n|N)	# Next player
			[[ $cur = black ]] && cur=white || cur=black
			;;
		esac
	done
#
#	Final output
#
	echo -e "\rPlayer 'black' had used: $black seconds"
	echo -e "\rPlayer 'white' had used: $white seconds"

:) ~ $ chessclock 
Game is paused, press 'b' to beginn/resume
Active Player (white):  secs
Active Player (white): 1 secs
Active Player (white): 2 secs
Active Player (white): 3 secs
Active Player (white): 4 secs
Active Player (black): 1 secs
Active Player (black): 2 secs
Active Player (white): 5 secs
Active Player (white): 6 secs
Active Player (black): 3 secs
Active Player (black): 4 secs
Active Player (black): 5 secs
Active Player (black): 6 secs
Active Player (black): 7 secs
Game is paused, press 'b' to beginn/resume
Active Player (black): 7 secs
Active Player (black): 8 secs
Active Player (black): 9 secs
Active Player (black): 10 secs
Active Player (white): 7 secs
Active Player (white): 8 secs
Player 'black' had used: 10 seconds
Player 'white' had used: 8 seconds