Data commit

Task/Tic-tac-toe/UNIX-Shell/tic-tac-toe.sh

@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+# play tic-tac-toe
+main() {
+  local play_again=1
+  while (( play_again )); do
+    local board=(1 2 3 4 5 6 7 8 9) tokens=(X O)
+    show_board "${board[@]}"
+    # player colors: computer is red, human is green
+    local computer=31 human=32
+    if (( RANDOM % 2 )); then
+      players=(computer human)
+      colors=($computer $human)
+      printf 'I go first!\n'
+    else
+      players=(human computer)
+      colors=($human $computer)
+      printf 'You go first!\n'
+    fi
+    local token winner
+    local -i turn=0
+    while ! winner=$(winner "${board[@]}"); do
+      token=${tokens[turn%2]}
+      case "${players[turn%2]}" in
+        human) board=($(human_turn "$token" "${board[@]}"));;
+        computer) board=($(computer_turn "$token" "${board[@]}"));;
+        *) printf 'Unknown player "%s"\n' "${players[turn%2]}"; exit 1;;
+      esac
+      show_board "${board[@]}" | sed -e "s/${tokens[0]}/"$'\e['"${colors[0]}"$'m&\e[0m/g' \
+                                     -e "s/${tokens[1]}/"$'\e['"${colors[1]}"$'m&\e[0m/g'
+
+      (( turn=turn+1 ))
+   done
+   case "$winner${players[0]}" in
+     Ohuman|Xcomputer) printf 'I win!\n';;
+     Xhuman|Ocomputer) printf 'You win!\n';;
+     cat*) printf 'The cat wins!\n';;
+   esac
+   yorn 'Play again'
+   play_again=$(( ! $? ))
+ done
+}
+
+show_board() {
+  printf '\n'
+  printf '%s %s %s\n' "$@"
+  printf '\n'
+}
+
+winner() {
+  local board=("$@") i j k
+  local lines=("0 1 2" "0 3 6" "0 4 8" "1 4 7"
+               "2 4 6" "2 5 8" "3 4 5" "6 7 8")
+  local line i j k
+  for line in "${lines[@]}"; do
+    read i j k <<<"$line"
+    local token=${board[i]}
+    if [[ "${board[j]}" == $token && "${board[k]}" == $token ]]; then
+      printf '%s\n' "$token"
+      return 0
+    fi
+  done
+  case "${board[*]}" in
+    *[1-9]*) return 1;;
+    *) printf 'cat\n'; return 0;;
+  esac
+}
+
+human_turn() {
+  local token=$1
+  shift
+  local board=("$@")
+  local n=0
+  while (( n < 1 || n > 9 )) || [[ "${board[n-1]}" != $n ]]; do
+    printf 'Enter space number: ' "$n"  "${board[n-1]}" >/dev/tty
+    read n </dev/tty >/dev/tty 2>&1
+  done
+  board[n-1]=$token
+  printf '%s\n' "${board[@]}"
+}
+
+computer_turn() {
+  local token=$1
+  shift
+  local board=("$@")
+  local i=0 blanks=() choice
+  for (( i=0; i<9; ++i )); do
+    if [[ "${board[i]}" == [1-9] ]]; then
+      blanks+=("$i")
+    fi
+  done
+  choice=${blanks[RANDOM % ${#blanks[@]}]}
+  board[choice]=$token
+  printf '%s\n' "${board[@]}"
+}
+
+yorn() {
+  local yorn=
+  while [[ $yorn != [Yy]* && $yorn != [Nn]* ]]; do
+    printf '%s? ' "$*"
+    read yorn
+  done
+  [[ $yorn == [Yy]* ]]
+}
+
+main "$@"