Created
July 20, 2023 03:20
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#!/usr/bin/env bash | |
# tictactoe.sh - tictactoe in bash for fun | |
# | |
set -eu | |
board=" " | |
turn="X" | |
print_board() { | |
tput smul | |
echo "0|${board:0:1}|${board:1:1}|${board:2:1}" | |
echo "1|${board:3:1}|${board:4:1}|${board:5:1}" | |
echo "2|${board:6:1}|${board:7:1}|${board:8:1}" | |
tput rmul | |
echo " |0|1|2" | |
echo | |
} | |
read_digit() { | |
name="$1" | |
while true; do | |
printf '%s> ' "$name" >&2 | |
read -r | |
if printf "%s" "$REPLY" | grep -qE "^[012]$"; then | |
break | |
else | |
echo "Invalid input" >&2 | |
fi | |
done | |
echo "$REPLY" | |
} | |
updated_board() { | |
sym="$1" | |
pos="$2" | |
next=$((pos + 1)) | |
echo "${board:0:$pos}${sym}${board:$next:9}" | |
} | |
check_win() { | |
s="$1" #symbol | |
# keep regex simpler - turn board into string of numbers for matching symbol | |
symstr=$(printf "%s" "$board" | fold -w1 | nl | grep "$s" | tr -d '\n') | |
printf "%s" "$symstr" | grep -q "1.*2.*3\|\ | |
4.*5.*6\|\ | |
7.*8.*9\|\ | |
1.*4.*7\|\ | |
2.*5.*8\|\ | |
3.*6.*9\|\ | |
1.*5.*9\|\ | |
3.*5.*7" | |
} | |
while true; do | |
print_board | |
while true; do | |
echo "*** player $turn ***" | |
row=$(read_digit "row") | |
col=$(read_digit "col") | |
pos=$((row * 3 + col)) | |
if [ "${board:pos:1}" != " " ]; then | |
echo "Position is not empty" >&2 | |
else | |
break | |
fi | |
done | |
board=$(updated_board "$turn" "$pos") | |
echo | |
if check_win $turn; then | |
echo "*** player $turn wins ***" | |
break | |
fi | |
if [ $turn = "X" ]; then | |
turn="O" | |
else | |
turn="X" | |
fi | |
done |
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Sample Run