tictactoe.sh

#!/bin/bash
  
trap exit INT
  
########################
#                      #
# ARRAY-LESS TICTACTOE #
#                      #
########################
# Beware: this thing is a monstrosity.
# Chances are, your eyes are going to burn as you read this,
# and you will ping me saying "What the hell is this crap??
# I could make something way better in pure bash with full
# busybox compatibility in 1 minute!!!"
# Just trust me on this one, it doesn't wipe your computer.
 
tmpdir="/tmp/tictactoe"
[[ ! -e "$tmpdir" ]] && mkdir -p "$tmpdir"
 
clean_up() {
        [[ "$tmpdir" ]] && rm -rf "$tmpdir/$password"
        clear
        exit 0
}   
 
checkwin(){
        for p in $player $oplayer; do
                          if [[ "$map" =~ $p\ $p\ $p\ [0-9]\ [0-9]\ [0-9]\ [0-9]\ [0-9]\ [0-9] ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ [0-9]\ [0-9]\ [0-9]\ $p\ $p\ $p\ [0-9]\ [0-9]\ [0-9] ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ [0-9]\ [0-9]\ [0-9]\ [0-9]\ [0-9]\ [0-9]\ $p\ $p\ $p ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ $p\ [0-9]\ [0-9]\ $p\ [0-9]\ [0-9]\ $p\ [0-9]\ [0-9] ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ [0-9]\ $p\ [0-9]\ [0-9]\ $p\ [0-9]\ [0-9]\ $p\ [0-9] ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ [0-9]\ [0-9]\ $p\ [0-9]\ [0-9]\ $p\ [0-9]\ [0-9]\ $p ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ $p\ [0-9]\ [0-9]\ [0-9]\ $p\ [0-9]\ [0-9]\ [0-9]\ $p ]]; then echo "$p" > "$gamedir/winner";
                        elif [[ "$map" =~ [0-9]\ [0-9]\ $p\ [0-9]\ $p\ [0-9]\ $p\ [0-9]\ [0-9] ]]; then echo "$p" > "$gamedir/winner";
                          fi
        done
        [[ "$map" != *"0"* ]] && [[ "$(cat $gamedir/winner)" == "0" ]] && echo "3" > "$gamedir/winner"
        if [[ "$(cat $gamedir/winner)" != "0" ]]; then return 0; else return 1; fi
}
 
tttgame() {
        case $player in
                1) oplayer=2; mark="O";;
                2) oplayer=1; mark="X";;
                *) echo "Broken player number" && exit 1;;
        esac
        if [[ "$player" == "1" ]]; then
                echo "Waiting for another player to join..."
                until [[ "$(cat $gamedir/players)" == "2" ]]; do
                        sleep 0.5s
                done
        fi
        map="$(cat $gamedir/map)"
        until [[ "$(cat $gamedir/winner)" != "0" ]]; do
                echo "Waiting for player $oplayer..."
                until [[ "$(cat $gamedir/turn)" == "$player" ]]; do
                        checkwin && break="1" && break
                        [[ ! -e "$gamedir" ]] && clear && echo "The other player has disconnected." && exit 1
                        sleep 0.5s
                done
                [[ break = "1" ]] && break
                map="$(cat $gamedir/map)"
                clear
                unset blockid checkid block available availableraw
                for mapblock in $map; do
                        # 0 - Empty space
                        # 1 - Player 1's space
                        # 2 - Player 2's space
                        let blockid++
                        case $blockid in
                                1) echo "   a b c"; printf "1 ";;
                                4) printf "2 ";;
                                7) printf "3 ";;
                        esac
                        printf "|"
                        case $mapblock in
                                0) printf " "; availableraw="$availableraw 1";;
                                1) printf "O"; availableraw="$availableraw 0";;
                                2) printf "X"; availableraw="$availableraw 0";;
                        esac
                        if [[ "$blockid" == "3" ]] || [[ "$blockid" == "6" ]] || [[ "$blockid" == "9" ]]; then
                                printf "|\n"
                        fi
                done
                availableraw=$(echo "$availableraw" | sed -e 's/^[ \t]*//')
                for tocheck in $availableraw; do
                        let checkid++
                        if [[ "$tocheck" != "0" ]]; then
                                case $checkid in
                                        1) available="$available 1a";;
                                        2) available="$available 1b";;
                                        3) available="$available 1c";;
                                        4) available="$available 2a";;
                                        5) available="$available 2b";;
                                        6) available="$available 2c";;
                                        7) available="$available 3a";;
                                        8) available="$available 3b";;
                                        9) available="$available 3c";;
                                esac
                        fi
                done
                available=$(echo "$available" | sed -e 's/^[ \t]*//')
                checkwin && break
                echo "You are player $player. Your blocks are marked with $mark."
                until [[ "$block" ]] && [[ "$available" == *"$block"* ]]; do
                        read -p "Where do you want to place your block? (Available options: $available) > " -re block
                        [[ ! -e "$gamedir" ]] && clear && echo "The other player has disconnected." && exit 1
                        [[ "$available" != *"$block"* ]] && echo "Invalid block."
                done
                [[ ! -e "$gamedir" ]] && clear && echo "The other player has disconnected." && exit 1
                case $block in
                        1a) echo "$map" | awk -v r="$player" '{$1=r}1' > "$gamedir/map";;
                        1b) echo "$map" | awk -v r="$player" '{$2=r}1' > "$gamedir/map";;
                        1c) echo "$map" | awk -v r="$player" '{$3=r}1' > "$gamedir/map";;
                        2a) echo "$map" | awk -v r="$player" '{$4=r}1' > "$gamedir/map";;
                        2b) echo "$map" | awk -v r="$player" '{$5=r}1' > "$gamedir/map";;
                        2c) echo "$map" | awk -v r="$player" '{$6=r}1' > "$gamedir/map";;
                        3a) echo "$map" | awk -v r="$player" '{$7=r}1' > "$gamedir/map";;
                        3b) echo "$map" | awk -v r="$player" '{$8=r}1' > "$gamedir/map";;
                        3c) echo "$map" | awk -v r="$player" '{$9=r}1' > "$gamedir/map";;
                        *) echo "Wrong block"; exit 1;;
                esac
                clear
                echo "$oplayer" > "$gamedir/turn"
                checkwin && break
        done
                echo "The winner is:"
                gamewinner="$(cat $gamedir/winner)"
                sleep 1s
                case $gamewinner in
                        1) echo "Player 1!";;
                        2) echo "Player 2!";;
                        3) echo "Nobody, it's a match!";;
                esac
                sleep 2s
                clean_up &>/dev/null
                exit 0

}

clear
echo "=== TIC TAC TOE ==="
echo "Type in your password (a nonexistent password will start a new game):"
read -re password
[[ -z "$password" ]] && echo "Password empty!" && exit 1
trap clean_up INT
if [[ -d "$tmpdir/$password" ]]; then
        if [[ "$(cat $tmpdir/$password/players)" = "2" ]]; then
                echo "Game $password full!"
                exit 1
        else
                echo -e "Joining $password..."
                player=2
                gamedir="$tmpdir/$password"
                echo "2" > "$gamedir/players"
                tttgame
        fi
else
        echo -e "Creating new game."
        mkdir "$tmpdir/$password"
        player=1
        gamedir="$tmpdir/$password"
        echo "1" > "$gamedir/turn"
        echo "0 0 0 0 0 0 0 0 0" > "$gamedir/map"
        echo "1" > "$gamedir/players"
        echo "0" > "$gamedir/winner"
        tttgame
fi