start.sh

#!/bin/bash

#– | \ / 

PushCommandLineParameters()
{
	for ((i=0; i < 5; i++))
	do
		if [ -z $1 ]
		then
			break
		fi
		
		case "$1" in
		"-l") #level
			SetLevel $2
			break
		;;
		"-c") #countFood
			maxCountFood=$2
		;;
		"-p") #pause
			pause=$2
		;;
		"-n") #N
			n=$2
		;;
		"-h")
			Help
		;;
		*)
			echo "Undefined parameter" $1
			exit
		;;

		esac
		shift 2
	done
}

Help()
{
	echo    "Help:"
	echo    "-l n  -  set level number"
	echo    "-c n  -  count of food on map"  
	echo	"-p n  -  waiting time for direction selection (example: -p 0.4)"
	echo	"-n n  -  width and height of the field"
	echo	"-h    -  print this help"
	echo    "Example: ./start -c 5 -p 0.3 -n 20"
	exit
}

SetLevel()
{
	l=$1
	if [ $l -lt 0 ]
	then
		l=0
	fi

	if [ $l -gt 20 ]
	then
		l=20
	fi

	#0..20
	#n - 7..20
	#c - 20%
	#p - 0.25 - 0.1

	if [ $l -lt 7 ]
	then
		n=7
	else
		n=$l
	fi
	
	let "maxCountFood=n*n/20"
	pause=0`echo "0.25-0.01*$l" | bc`

}

NewGameInit()
{
	newGame="false"
	lastDirection=">"
	direction=">"
	turn="–"
	score=0
	countFood=0
	nextStep=0
	zmei=( $( [ $(($count/2)) -gt 0 ] && echo $(($count/2)) ) $( [ $(($count/2-1)) -gt 0 ] && echo $(($count/2-1)) ) $( [ $(($count/2-2)) -gt 0 ] && echo $(($count/2-2)) ) $( [ $(($count/2-3)) -gt 0 ] && echo $(($count/2-3)) ) $( [ $(($count/2-4)) -gt 0 ] && echo $(($count/2-4)) ) )
}

Init()
{
	maxCountFood=3
	n=8
	pause=0.25
	declare -a highScore
	PushCommandLineParameters $1 $2 $3 $4 $5 $6 $7 $8 $9
	count=$(($n*$n))
	HighScoreInit
	NewGameInit
}

ClearTable()
{
	for (( i=0;i<$count;i++ ))
        do
        	pole[i]="*"
		color[i]="\e[0m"
        done
}


ApplySnake()
{

	for i in "${zmei[@]}"
	do
		pole[i]="–"
		color[i]="\e[1;32m"
	done
	pole[${zmei[0]}]=$direction
	color[${zmei[0]}]="\e[1;32m"
}


ReadKeyboard()
{
	read -s -n 3 -t $pause key
	case $(echo $key | cat -v) in
        	'^[[A')
                	direction='^'
	        ;;
        	'^[[B')
                	direction='⌄'
	        ;;
        	'^[[C')
                	direction='>'
	        ;;
        	'^[[D')
	                direction='<'
        	;;
	esac
}

NewFood()
{
	let countFood=$countFood+1
	i=$((RANDOM % $count))
	while [ "${pole[$i]}" != "*" ]
	do
		i=$((RANDOM % $count))
	done
	pole[$i]="0"
	color[$i]="\e[31m"

}


Init $1 $2 $3 $4 $5 $6 $7 $8 $9 
ClearTable
ApplySnake

NewGame()
{
	HighScoreAdd
	echo "New game?(Enter)"
	read key
	if [[ "$key" = "Y" || "$key" = "y" || "$key" = "" ]]
	then
		NewGameInit
		ClearTable
		ApplyZmei
		newGame="true"
	else
		exit
	fi
}

GameOver()
{
	echo -ne "\e[1;41m"
	echo  """   ____                       ___                 
  / ___| __ _ _ __ ___   ___ / _ \\__   _____ _ __ 
 | |  _ / _\` | '_ \` _ \\ / _ | | | \\ \\ / / _ | '__|
 | |_| | (_| | | | | | |  __| |_| |\\ V |  __| |   
  \\____|\\__,_|_| |_| |_|\\___|\\___/  \\_/ \\___|_|   
                                                  """
	echo -ne "\e[0m"
	NewGame
}

Victory()
{
	clear
	echo -en "\e[1;42m"
	echo """__     ___      _                   
\ \\   / (_) ___| |_ ___  _ __ _   _ 
 \\ \\ / /| |/ __| __/ _ \\| '__| | | |
  \\ V / | | (__| || (_) | |  | |_| |
   \\_/  |_|\\___|\\__\\___/|_|   \\__, |
                              |___/ 
				    """
	echo -ne "\e[0m"
	NewGame
}

HighScoreInit()
{
	if [ -f highscore ]
	then
		index=0
		while read line; do
		    if [ -z $line ]
		    then
		    	continue
		    fi
		    hishScore[$index]="$line"
		    index=$(($index+1))
		done < highscore
	fi
}

HighScoreAdd()
{
	echo -n "Enter your name: "
	read name
	##TODO make this
}

TestStep()
{
	if [ "${pole[$nextStep]}" = "0" ]
	then
		#find food
		if [ ${#zmei[@]} -eq $count ]
		then
			Victory
		fi

		let score=$score+10
		let countFood=$countFood-1
	
		zmei=( "${zmei[@]}" "forDelete" )
	fi
}

TestGameOver()
{
	if [[ "${pole[$nextStep]}" = '|' || "${pole[$nextStep]}" = '/' || "${pole[$nextStep]}" = "\\" || "${pole[$nextStep]}" = "–" ]]
	then
		GameOver
	fi
}

SnakeTurn()
{
	if [[ $direction = '>' && $lastDirection = '⌄' ||  $direction = '⌄' && $lastDirection = '>' ||  $direction = '<' && $lastDirection = '^' ||  $direction = '^' && $lastDirection = '<' ]]
	then
		turn="\\"
	fi
	
	if [[ $direction = '>' && $lastDirection = '^' ||  $direction = '^' && $lastDirection = '>' ||  $direction = '<' && $lastDirection = '⌄' ||  $direction = '⌄' && $lastDirection = '<' ]]
	then
		turn="/"
	fi

	if [[ $direction = '^' && $lastDirection = '^' ||  $direction = '⌄' && $lastDirection = '⌄' ]]
	then
		turn="|"
	fi

	if [[ $direction = '>' && $lastDirection = '>' ||  $direction = '<' && $lastDirection = '<' ]]
	then
		turn="–"
	fi
}

while [ true ]
do
	clear

	if [ $countFood -lt $maxCountFood ]
	then
		NewFood
	fi


	#--------------------------------------------------print table and score
	last_j=0
	for (( c=0;c<$count;c++ ))
	do	
		echo -ne "${color[$c]}"
		echo -ne "${pole[$c]}"
		echo -ne "\e[0m"
		let "j=($c+1)/$n"
	
		if [ $last_j -ne $j ]
		then
			echo
			last_j=$j
		fi
	done
	echo -e "Score: \e[1m$score\e[0m"
	#--------------------------------------------------print table and score ~


	lastDirection=$direction
	ReadKeyboard

	#--------------------------------------------------calculation snake
	if [[ $direction = '>' && $lastDirection = '<' || $direction = '<' && $lastDirection = '>' || $direction = '^' && $lastDirection = '⌄' || $direction = '⌄' && $lastDirection = '^' ]]
	then
		direction=$lastDirection
	fi


	case $direction in 
		">")
			nextStep=$(( (count + zmei[0] + 1 - ( (zmei[0]+1)/$n - zmei[0]/$n)*$n ) %count ))
		;;
		"<")
			nextStep=$(( (count + zmei[0] - 1 + (zmei[0]/$n - (zmei[0]-1)/$n)*$n) % count ))
		;;
		"^")
			nextStep=$(( (count + zmei[0] - $n) % count))
		;;
		"⌄")
			nextStep=$(( (zmei[0] + $n) % count))
		;;
	esac

	TestStep
	if [[ "$newGame" = "true" ]]
	then
		newGame="false"
		continue
	fi
	SnakeTurn

	pole[${zmei[0]}]="$turn" #change old head


	if [[ "${zmei[$((${#zmei[@]}-1))]}" != 'forDelete' ]]
	then
		pole[${zmei[$((${#zmei[@]}-1))]}]="*" #delete old tail
		color[${zmei[$((${#zmei[@]}-1))]}]="\e[0m"
	
	fi

	TestGameOver

	if [[ "$newGame" = "true" ]]
	then
		newGame="false"
		continue
	fi

	zmei[$((${#zmei[@]}-1))]="" #delete old tail

	zmei=( "$nextStep"  ${zmei[@]} )
	pole[${zmei[0]}]="$direction" #new head
	color[${zmei[0]}]="\e[1;32m"
	#--------------------------------------------------calculation snake~
done