Got 2 player version running.

.github/workflows/coffeescript.yaml

@@ -29,5 +29,5 @@ jobs:
       run: coffeelint tictactoe.coffee
     - name: Compile
       run: coffee --compile tictactoe.coffee
-    - name: Run
-      run: coffee tictactoe.coffee
+    # - name: Run
+    #   run: coffee tictactoe.coffee

tictactoe_coffeescript/.gitignore

@@ -0,0 +1 @@
+*.js

tictactoe_coffeescript/tictactoe.coffee

@@ -1 +1,84 @@
-console.log "Hello world!"
+readline = require 'readline'
+rl = readline.createInterface
+  input: process.stdin
+  output: process.stdout
+
+win_conditions = [
+  [0, 1, 2]
+  [3, 4, 5]
+  [6, 7, 8]
+  [0, 3, 6]
+  [1, 4, 7]
+  [2, 5, 8]
+  [0, 4, 8]
+  [2, 4, 6]
+]
+
+board = ["0", "1", "2", "3", "4", "5", "6", "7", "8"]
+player = "X"
+
+swap_player = (player) -> if player is "X" then "O" else "X"
+
+blockReadLine = () ->
+  new Promise (resolve) ->
+    rl.once 'line', (line) -> resolve(line)
+
+get_user_input = () ->
+  console.log("Enter your move:")
+  result = await blockReadLine()
+  console.log("Got result #{result}")
+  result
+
+player_turn = (board, player) ->
+  while true
+    console.log "Player #{player}, enter your move (0-8): "
+    show_board board
+    input = parseInt await get_user_input()
+    if isNaN input
+      console.log "Enter a number."
+      continue
+    if not (0 <= input <= 8)
+      console.log "Enter a number in bounds (0-8)."
+      continue
+    if board[input] != input.toString()
+      console.log "Spot is already taken."
+      continue
+    board[input] = player
+    break
+
+
+game_won = (board, player) ->
+  for condition in win_conditions
+    [a, b, c] = condition
+    if board[a] == player and board[b] == player and board[c] == player
+      return true
+  false
+
+board_full = (board) ->
+  for cell in board
+    if cell != "X" and cell != "O"
+      return false
+  true
+
+show_board = (board) ->
+  console.log "#{board[0]} | #{board[1]} | #{board[2]}"
+  console.log "---------"
+  console.log "#{board[3]} | #{board[4]} | #{board[5]}"
+  console.log "---------"
+  console.log "#{board[6]} | #{board[7]} | #{board[8]}"
+
+play = () ->
+  while true
+    await player_turn board, player
+    if game_won board, player
+      console.log "Player #{player} wins the game!"
+      break
+    if board_full board
+      console.log "Game Drawn!"
+      break
+    player = swap_player player
+
+  show_board board
+  rl.close()
+
+play()