Failed attempt at IORef

src/Main.hs

@@ -2,6 +2,7 @@ module Main where
 
 import Control.Monad
 import Control.Concurrent (threadDelay)
+import Data.IORef
 
 import System.Random
 
@@ -22,25 +23,42 @@ setup w = void $ do
     UI.addStyleSheet w "minesweeper.css"
 
     rng <- liftIO newStdGen
-    let board = uncover (createBoard 30 0.15 rng) (4,4)
+    
+    iob <- liftIO $ newIORef (createBoard 30 0.15 rng :: Board)
+    b <- liftIO $ readIORef iob
 
     getBody w #+ [
         UI.div #. "container" #+ [
             UI.h1 #+ [string "Minesweeper"],
-            --UI.h4 #+ [string "By Jack Harley <jharley@tcd.ie>"],
-            gameGridTable board
+            UI.h4 #+ [string "Jack Harley jharley@tcd.ie"],
+            mkElement "table" #+ rows iob 0
         ]]
 
-gameGridTable :: Board -> UI Element
-gameGridTable b = mkElement "table" #+ rows b
+rows :: IORef Board -> Int -> [UI Element]
+rows iob r = do
+    b <- liftIO $ readIORef iob
 
-rows :: Board -> [UI Element]
-rows b = rows' b 0
-rows' b r | r < size b = (mkElement "tr" #+ cells b r) : rows' b (r+1)
-          | otherwise = []
+    rows' iob b r
 
-cells :: Board -> Int -> [UI Element]
-cells b r = cells' b r 0
-cells' b r c | c < size b = mkElement "td" #. (squareBgColour b (r,c) ++ " " ++ squareTextColour b (r,c)) 
-                                           #+ [string $ squareAscii b (r,c)] : cells' b r (c+1)
-             | otherwise = []
+    where
+        rows' iob b r | r < size b = (mkElement "tr" #+ cells iob b r 0) : rows' iob b (r+1)
+                      | otherwise = []
+
+cells :: IORef Board -> Board -> Int -> Int -> [UI Element]
+cells iob b r c = do
+    cells' iob b r c
+
+    where
+        cells' iob b r c | c < size b = cell iob b (r,c) : cells' iob b r (c+1)
+                         | otherwise = []
+
+
+cell :: IORef Board -> Board -> Square -> UI Element
+cell iob b (r,c) = do
+    cell <- mkElement "td" #. (squareBgColour b (r,c) ++ " " ++ squareTextColour b (r,c)) 
+                           #+ [string $ squareAscii b (r,c)]
+
+    on UI.click cell $ \_ -> do
+        liftIO $ modifyIORef' iob $ \oldB -> uncover oldB (r,c)
+
+    return cell