refactor(day2): tidy up

solutions/Days/Day02.hs

@@ -15,38 +15,26 @@ data Shape = Rock | Paper | Scissors
 data Outcome = Win | Lose | Draw
   deriving (Eq)
 
-convertToShape :: T.Text -> Shape
-convertToShape x
-  | x == "A" || x == "X" = Rock
-  | x == "B" || x == "Y" = Paper
-  | x == "C" || x == "Z" = Scissors
-  | otherwise = error $ show x
+toShape :: T.Text -> Shape
+toShape c
+  | c == "A" || c == "X" = Rock
+  | c == "B" || c == "Y" = Paper
+  | c == "C" || c == "Z" = Scissors
+  | otherwise = error $ show c
 
-convertToOutcome :: T.Text -> Outcome
-convertToOutcome "X" = Lose
-convertToOutcome "Y" = Draw
-convertToOutcome "Z" = Win
+toOutcome :: T.Text -> Outcome
+toOutcome "X" = Lose
+toOutcome "Y" = Draw
+toOutcome "Z" = Win
+toOutcome c = error $ show c
 
-parseInput :: T.Text -> [(Shape, T.Text)]
-parseInput input = map someFunc . T.lines $ input -- ["A Y", "B X"] -> [(Rock, Paper), (Paper, Scissors)]
-  where
-    someFunc :: T.Text -> (Shape, T.Text)
-    someFunc line = (convertToShape first, second)
-      where
-        [first, second] = T.words $ line
-
-score :: Shape -> Int
-score Rock = 1
-score Paper = 2
-score Scissors = 3
-
-part1 :: [(Shape, T.Text)] -> Int
-part1 input = sum $ map (\(opp, player) -> outcomeScore (opp, player) + score player) input'
-  where
-    input' = map (B.second convertToShape) input
+pScore :: Shape -> Int
+pScore Rock = 1
+pScore Paper = 2
+pScore Scissors = 3
 
-outcomeScore :: (Shape, Shape) -> Int
-outcomeScore (opp, player)
+oScore :: (Shape, Shape) -> Int
+oScore (opp, player)
   | player == beats opp = 6
   | player == loses opp = 0
   | otherwise = 3
@@ -61,15 +49,21 @@ loses Rock = Scissors
 loses Paper = Rock
 loses Scissors = Paper
 
+scores :: [(Shape, Shape)] -> [Int]
+scores = map (\(o, p) -> oScore (o, p) + pScore p)
+
+parseInput :: T.Text -> [(Shape, T.Text)]
+parseInput = map convert . T.lines
+  where
+    convert line = let [fst, snd] = T.words line in (toShape fst, snd)
+
+part1 :: [(Shape, T.Text)] -> Int
+part1 input = sum $ scores $ map (B.second toShape) input
+
 part2 :: [(Shape, T.Text)] -> Int
-part2 input = sum $ map (\(opp, player) -> outcomeScore (opp, player) + score player) shapeList
+part2 input = sum $ scores $ map tupleToShape outcomes
   where
-    outcomeList = map (B.second convertToOutcome) input -- [(Shape, Outcome)]
-    shapeList = map outcomeToShape outcomeList
-    outcomeToShape (shape, outcome) =
-      let outcome' =
-            case outcome of
-              Win -> beats shape
-              Lose -> loses shape
-              Draw -> shape
-       in (shape, outcome')
+    outcomes = map (B.second toOutcome) input
+    tupleToShape (shape, Win) = (shape, beats shape)
+    tupleToShape (shape, Lose) = (shape, loses shape)
+    tupleToShape (shape, _) = (shape, shape)