seb-jones/bashjack.sh

## bashjack.sh
#!/usr/bin/bash
#
# Simple Blackjack game written in Bash. To play, give this file
# execute permissions and run it:
#   chmod u+x bashjack.sh
#   ./bashjack.sh
#
# Alternatively you can run Bash with this file as an argument:
#   bash bashjack.sh
#
# Input keys are indicated by single characters surrounded by
# brackets. For example, '(h)it' can be read as 'Press h to hit.'
#
# The '-d' option may be used to specify the delay between messages:
#   ./bashjack.sh -d '0.2'
#
# This value is passed as an argument to the `sleep` command, and
# defaults to '1'.
#
# Written by Seb Jones (https://sebj.co.uk)

getopts "d:" message_delay

message_delay=${OPTARG:-"1"}

declare -a deck player_hand dealer_hand

function new_deck
{
    cards=(
        "Two|2"
        "Three|3"
        "Four|4"
        "Five|5"
        "Six|6"
        "Seven|7"
        "Eight|8"
        "Nine|9"
        "Ten|10"
        "Jack|10"
        "Queen|10"
        "King|10"
        "Ace|1"
    )

    suites=(
        "Diamonds"
        "Hearts"
        "Clubs"
        "Spades"
    )

    for suite in ${suites[@]}; do
        for card in ${cards[@]}; do
            echo "$suite|$card"
        done
    done
}

function card_suite
{
    echo "$1" | cut --delimiter="|" --fields="1,1"
}

function card_name
{
    echo "$1" | cut --delimiter="|" --fields="2,2"
}

function card_value
{
    echo "$1" | cut --delimiter="|" --fields="3,3"
}

function card_is_ace
{
    [[ "$(card_name $1)" == "Ace" ]]
}

function card_is_face
{
    pattern='^(Jack|Queen|King)$'
    [[ "$(card_name $1)" =~ $pattern ]]
}

function card_full_name
{
    echo "$(card_name $1) of $(card_suite $1)"
}

function card_abbreviation
{
    if (card_is_face $1 || card_is_ace $1); then
        name=$(card_name $1)
        name=${name:0:1}
    else
        name="$(card_value $1)"
    fi

    suite=$(card_suite $1)

    echo "$name-${suite:0:1}"
}

function hand_value
{
    sorted_hand=($(echo "$@" | tr ' ' "\n" | sort --field-separator='|' --key='3,3n'))

    declare -i value=0

    for card in ${sorted_hand[@]}; do
        card_value=$(card_value $card)
        value=$((value + card_value))
    done

    if [[ $value -lt 12 ]]; then
        for card in ${sorted_hand[@]}; do
            if card_is_ace $card; then
                value+=10
            fi

            if [[ $value -gt 12 ]]; then
                break
            fi
        done
    fi

    echo $value
}

function hand_abbreviation
{
    echo -n "( "
    for card in $@; do
        echo -n "$(card_abbreviation $card) "
    done
    echo ")"
}

function hand_is_bust
{
    [[ $(hand_value $@) -gt 21 ]]
}

function hand_is_blackjack
{
    [[ $# -eq 2 && $(hand_value $@) -eq 21 ]]
}

function echo_with_delay
{
    echo -e $@
    sleep $message_delay
}

function hit_dealer
{
    card=${deck[0]}
    deck=(${deck[@]:1})
    dealer_hand+=($card)

    echo_with_delay "\nDealer draws $(card_full_name $card)"
}

function hit_player
{
    card=${deck[0]}
    deck=(${deck[@]:1})
    player_hand+=($card)

    echo_with_delay "\nPlayer draws $(card_full_name $card)"
}

function player_turn
{
    input=""

    until [[ $input == "s" ]]; do
        echo_with_delay "\nPlayer hand: $(hand_value ${player_hand[@]}) $(hand_abbreviation ${player_hand[@]})\n\n(h)it or (s)tay?"

        read -s -n 1 input
        input=${input,,}

        if [[ $input == "h" ]]; then
            hit_player

            if hand_is_bust ${player_hand[@]}; then
                return 1;
            fi
        fi
    done

    echo_with_delay "\nPlayer stays."

    return 0;
}

function dealer_turn
{
    echo_with_delay "\nDealer reveals $(card_full_name ${dealer_hand[1]})."

    dealer_hand_value=$(hand_value ${dealer_hand[@]})

    echo_with_delay "\nDealer hand: $dealer_hand_value $(hand_abbreviation ${dealer_hand[@]})."

    player_hand_value=$(hand_value ${player_hand[@]})

    until [[ $dealer_hand_value -ge 17 || $dealer_hand_value -gt $player_hand_value ]]; do
        hit_dealer

        dealer_hand_value=$(hand_value ${dealer_hand[@]})

        echo_with_delay "\nDealer hand: $dealer_hand_value $(hand_abbreviation ${dealer_hand[@]})."
    done

    if hand_is_bust ${dealer_hand[@]}; then
        return 1;
    fi

    echo_with_delay "\nDealer stays."

    return 0
}

function new_game
{
    deck=($(new_deck | shuf))

    player_hand=(${deck[@]:0:2})
    dealer_hand=(${deck[@]:2:2})

    deck=(${deck[@]:4})

    echo_with_delay "\nPlayer draws $(card_full_name ${player_hand[0]}) and $(card_full_name ${player_hand[1]})."

    if hand_is_blackjack ${player_hand[@]}; then
        if hand_is_blackjack ${dealer_hand[@]}; then
            echo_with_delay "\nDealer has $(card_full_name ${dealer_hand[0]}) and $(card_full_name ${dealer_hand[1]})."

            echo_with_delay "\nBoth players have blackjack. Game is a draw."
        else
            echo_with_delay "\nBlackjack!"
        fi

        return
    elif hand_is_blackjack ${dealer_hand[@]}; then
        echo_with_delay "\nDealer has $(card_full_name ${dealer_hand[0]}) and $(card_full_name ${dealer_hand[1]})."

        echo_with_delay "\nDealer has blackjack. Dealer wins."
        return
    fi

    echo_with_delay "\nDealer shows $(card_full_name ${dealer_hand[0]})."

    if ! player_turn; then
        echo_with_delay "\nPlayer bust."
        return
    fi

    if ! dealer_turn; then
        echo_with_delay "\nDealer bust."
        return
    fi

    player_hand_value=$(hand_value ${player_hand[@]})
    dealer_hand_value=$(hand_value ${dealer_hand[@]})

    echo_with_delay "\nPlayer has $player_hand_value. Dealer has $dealer_hand_value."

    if [[ $player_hand_value -gt $dealer_hand_value ]]; then
        echo_with_delay "\nPlayer wins."
    elif [[ $player_hand_value -lt $dealer_hand_value ]]; then
        echo_with_delay "\nDealer wins."
    else
        echo_with_delay "\nGame is a draw."
    fi
}

function menu_loop
{
    input=""

    until [[ $input == "q" ]]; do
        echo_with_delay "\n(p)lay or (q)uit?"
        read -s -n 1 input
        input=${input,,}

        if [[ $input == "p" ]]; then
            new_game
        fi
    done

    return 0
}

menu_loop

exit 0
	#!/usr/bin/bash
	#
	# Simple Blackjack game written in Bash. To play, give this file
	# execute permissions and run it:
	# chmod u+x bashjack.sh
	# ./bashjack.sh
	#
	# Alternatively you can run Bash with this file as an argument:
	# bash bashjack.sh
	#
	# Input keys are indicated by single characters surrounded by
	# brackets. For example, '(h)it' can be read as 'Press h to hit.'
	#
	# The '-d' option may be used to specify the delay between messages:
	# ./bashjack.sh -d '0.2'
	#
	# This value is passed as an argument to the `sleep` command, and
	# defaults to '1'.
	#
	# Written by Seb Jones (https://sebj.co.uk)

	getopts "d:" message_delay

	message_delay=${OPTARG:-"1"}

	declare -a deck player_hand dealer_hand

	function new_deck
	{
	cards=(
	"Two\|2"
	"Three\|3"
	"Four\|4"
	"Five\|5"
	"Six\|6"
	"Seven\|7"
	"Eight\|8"
	"Nine\|9"
	"Ten\|10"
	"Jack\|10"
	"Queen\|10"
	"King\|10"
	"Ace\|1"
	)

	suites=(
	"Diamonds"
	"Hearts"
	"Clubs"
	"Spades"
	)

	for suite in ${suites[@]}; do
	for card in ${cards[@]}; do
	echo "$suite\|$card"
	done
	done
	}

	function card_suite
	{
	echo "$1" \| cut --delimiter="\|" --fields="1,1"
	}

	function card_name
	{
	echo "$1" \| cut --delimiter="\|" --fields="2,2"
	}

	function card_value
	{
	echo "$1" \| cut --delimiter="\|" --fields="3,3"
	}

	function card_is_ace
	{
	[[ "$(card_name $1)" == "Ace" ]]
	}

	function card_is_face
	{
	pattern='^(Jack\|Queen\|King)$'
	[[ "$(card_name $1)" =~ $pattern ]]
	}

	function card_full_name
	{
	echo "$(card_name $1) of $(card_suite $1)"
	}

	function card_abbreviation
	{
	if (card_is_face $1 \|\| card_is_ace $1); then
	name=$(card_name $1)
	name=${name:0:1}
	else
	name="$(card_value $1)"
	fi

	suite=$(card_suite $1)

	echo "$name-${suite:0:1}"
	}

	function hand_value
	{
	sorted_hand=($(echo "$@" \| tr ' ' "\n" \| sort --field-separator='\|' --key='3,3n'))

	declare -i value=0

	for card in ${sorted_hand[@]}; do
	card_value=$(card_value $card)
	value=$((value + card_value))
	done

	if [[ $value -lt 12 ]]; then
	for card in ${sorted_hand[@]}; do
	if card_is_ace $card; then
	value+=10
	fi

	if [[ $value -gt 12 ]]; then
	break
	fi
	done
	fi

	echo $value
	}

	function hand_abbreviation
	{
	echo -n "( "
	for card in $@; do
	echo -n "$(card_abbreviation $card) "
	done
	echo ")"
	}

	function hand_is_bust
	{
	[[ $(hand_value $@) -gt 21 ]]
	}

	function hand_is_blackjack
	{
	[[ $# -eq 2 && $(hand_value $@) -eq 21 ]]
	}

	function echo_with_delay
	{
	echo -e $@
	sleep $message_delay
	}

	function hit_dealer
	{
	card=${deck[0]}
	deck=(${deck[@]:1})
	dealer_hand+=($card)

	echo_with_delay "\nDealer draws $(card_full_name $card)"
	}

	function hit_player
	{
	card=${deck[0]}
	deck=(${deck[@]:1})
	player_hand+=($card)

	echo_with_delay "\nPlayer draws $(card_full_name $card)"
	}

	function player_turn
	{
	input=""

	until [[ $input == "s" ]]; do
	echo_with_delay "\nPlayer hand: $(hand_value ${player_hand[@]}) $(hand_abbreviation ${player_hand[@]})\n\n(h)it or (s)tay?"

	read -s -n 1 input
	input=${input,,}

	if [[ $input == "h" ]]; then
	hit_player

	if hand_is_bust ${player_hand[@]}; then
	return 1;
	fi
	fi
	done

	echo_with_delay "\nPlayer stays."

	return 0;
	}

	function dealer_turn
	{
	echo_with_delay "\nDealer reveals $(card_full_name ${dealer_hand[1]})."

	dealer_hand_value=$(hand_value ${dealer_hand[@]})

	echo_with_delay "\nDealer hand: $dealer_hand_value $(hand_abbreviation ${dealer_hand[@]})."

	player_hand_value=$(hand_value ${player_hand[@]})

	until [[ $dealer_hand_value -ge 17 \|\| $dealer_hand_value -gt $player_hand_value ]]; do
	hit_dealer

	dealer_hand_value=$(hand_value ${dealer_hand[@]})

	echo_with_delay "\nDealer hand: $dealer_hand_value $(hand_abbreviation ${dealer_hand[@]})."
	done

	if hand_is_bust ${dealer_hand[@]}; then
	return 1;
	fi

	echo_with_delay "\nDealer stays."

	return 0
	}

	function new_game
	{
	deck=($(new_deck \| shuf))

	player_hand=(${deck[@]:0:2})
	dealer_hand=(${deck[@]:2:2})

	deck=(${deck[@]:4})

	echo_with_delay "\nPlayer draws $(card_full_name ${player_hand[0]}) and $(card_full_name ${player_hand[1]})."

	if hand_is_blackjack ${player_hand[@]}; then
	if hand_is_blackjack ${dealer_hand[@]}; then
	echo_with_delay "\nDealer has $(card_full_name ${dealer_hand[0]}) and $(card_full_name ${dealer_hand[1]})."

	echo_with_delay "\nBoth players have blackjack. Game is a draw."
	else
	echo_with_delay "\nBlackjack!"
	fi

	return
	elif hand_is_blackjack ${dealer_hand[@]}; then
	echo_with_delay "\nDealer has $(card_full_name ${dealer_hand[0]}) and $(card_full_name ${dealer_hand[1]})."

	echo_with_delay "\nDealer has blackjack. Dealer wins."
	return
	fi

	echo_with_delay "\nDealer shows $(card_full_name ${dealer_hand[0]})."

	if ! player_turn; then
	echo_with_delay "\nPlayer bust."
	return
	fi

	if ! dealer_turn; then
	echo_with_delay "\nDealer bust."
	return
	fi

	player_hand_value=$(hand_value ${player_hand[@]})
	dealer_hand_value=$(hand_value ${dealer_hand[@]})

	echo_with_delay "\nPlayer has $player_hand_value. Dealer has $dealer_hand_value."

	if [[ $player_hand_value -gt $dealer_hand_value ]]; then
	echo_with_delay "\nPlayer wins."
	elif [[ $player_hand_value -lt $dealer_hand_value ]]; then
	echo_with_delay "\nDealer wins."
	else
	echo_with_delay "\nGame is a draw."
	fi
	}

	function menu_loop
	{
	input=""

	until [[ $input == "q" ]]; do
	echo_with_delay "\n(p)lay or (q)uit?"
	read -s -n 1 input
	input=${input,,}

	if [[ $input == "p" ]]; then
	new_game
	fi
	done

	return 0
	}

	menu_loop

	exit 0