Data commit

Task/24-game/CoffeeScript/24-game.coffee

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+tty = require 'tty'
+tty.setRawMode true
+
+buffer  = ""
+numbers = []
+
+for n in [0...4]
+    numbers.push Math.max 1, Math.floor(Math.random() * 9)
+
+console.log "You can use the numbers: #{numbers.join ' '}"
+
+process.stdin.on 'keypress', (char, key) ->
+
+    # accept operator
+    if char and isNaN(char) and /[()*\/+-]/.test(char) and buffer.substr(-1) isnt char
+        buffer += char
+        process.stdout.write char
+    # accept number
+    else if !isNaN(+char) and (buffer == '' or isNaN(buffer.substr -1))
+        buffer += char
+        process.stdout.write char
+
+    # check then evaluate expression
+    if key?.name is 'enter'
+        result = calculate()
+        process.stdout.write '\n'
+        if result and result is 24
+            console.log " = 24! congratulations."
+        else
+            console.log "#{result}. nope."
+        process.exit 0
+
+    # quit
+    if key?.name is 'escape' or (key?.name == 'c' and key.ctrl)
+        process.exit 0
+
+calculate = () ->
+
+    if /[^\d\s()+*\/-]/.test buffer
+        console.log "invalid characters"
+        process.exit 1
+
+    used = buffer.match(/\d/g)
+    if used?.length != 4 or used.sort().join() != numbers.sort().join()
+        console.log "you must use the 4 numbers provided"
+        process.exit 1
+
+    res = try eval buffer catch e
+    return res or 'invalid expression'
+
+
+# begin taking input
+process.stdin.resume()