Format files

src/Day1.hs

@@ -4,7 +4,9 @@ import qualified Data.IntSet as DIS
 import Data.Maybe (mapMaybe)
 
 type Target = Int
+
 type Expenses = [Int]
+
 type Expenses' = DIS.IntSet
 
 day1 :: IO ()
@@ -20,14 +22,14 @@ day1 = do
 -- the two numbers.
 fixExpenseReport :: Target -> Int -> Expenses -> Maybe Int
 fixExpenseReport t c es
-    | c <= 0 = error "unsupported"
-    | otherwise = fixExpenseReport' t c (DIS.fromList es)
+  | c <= 0 = error "unsupported"
+  | otherwise = fixExpenseReport' t c (DIS.fromList es)
 
 fixExpenseReport' :: Target -> Int -> Expenses' -> Maybe Int
 fixExpenseReport' t 1 es = if DIS.member t es then Just t else Nothing
 fixExpenseReport' t c es =
-    let foo x = (*x) <$> fixExpenseReport' (t-x) (c-1) (DIS.delete x es)
-        bar = mapMaybe foo (DIS.toList es) in
-    case bar of
+  let foo x = (* x) <$> fixExpenseReport' (t - x) (c -1) (DIS.delete x es)
+      bar = mapMaybe foo (DIS.toList es)
+   in case bar of
         [] -> Nothing
-        (x:_) -> Just x
+        (x : _) -> Just x

src/Day2.hs

@@ -2,41 +2,45 @@
 
 module Day2 (day2) where
 
-import qualified Data.Text as T
 import qualified Data.Attoparsec.Text as P
 import Data.List (elemIndices)
+import qualified Data.Text as T
 
 type Max = Int
+
 type Min = Int
+
 type Letter = Char
+
 type Validator = Policy -> String -> Bool
 
-data Policy = Policy { lBound :: Min
-                     , uBound :: Max
-                     , letter :: Letter
-                     }
+data Policy = Policy
+  { lBound :: Min,
+    uBound :: Max,
+    letter :: Letter
+  }
 
 parserPolicy :: P.Parser Policy
 parserPolicy = do
-    lB <- P.decimal
-    _ <- P.char '-'
-    uB <- P.decimal
-    _ <- P.char ' '
-    le <- P.letter
-    _ <- P.string ": "
-    return $ Policy lB uB le
+  lB <- P.decimal
+  _ <- P.char '-'
+  uB <- P.decimal
+  _ <- P.char ' '
+  le <- P.letter
+  _ <- P.string ": "
+  return $ Policy lB uB le
 
 validatePolicy :: Validator
 validatePolicy p s =
-    let l = length $ filter (== letter p) s in
-    l >= lBound p && l <= uBound p
+  let l = length $ filter (== letter p) s
+   in l >= lBound p && l <= uBound p
 
 validateLine :: Validator -> String -> Bool
 validateLine v s =
-    case P.parse parserPolicy (T.pack s) of
-        P.Fail {} -> error "day2 - parser error"
-        P.Partial _ -> error "day2 - input error"
-        P.Done i r -> v r (T.unpack i)
+  case P.parse parserPolicy (T.pack s) of
+    P.Fail {} -> error "day2 - parser error"
+    P.Partial _ -> error "day2 - input error"
+    P.Done i r -> v r (T.unpack i)
 
 xor :: Bool -> Bool -> Bool
 xor True = not
@@ -44,16 +48,15 @@ xor False = id
 
 validateCorrectPolicy :: Validator
 validateCorrectPolicy p s =
-    let index1 = lBound p - 1
-        index2 = uBound p - 1
-        indices = elemIndices (letter p) s in
-        xor (index1 `elem` indices) (index2 `elem` indices)
-
+  let index1 = lBound p - 1
+      index2 = uBound p - 1
+      indices = elemIndices (letter p) s
+   in xor (index1 `elem` indices) (index2 `elem` indices)
 
 day2 :: IO ()
 day2 = do
   rs <- lines <$> readFile "./input/day2"
   putStr "[Day 2-1] # valid passwords: "
-  print . length . filter (==True) . fmap (validateLine validatePolicy) $ rs
+  print . length . filter (== True) . fmap (validateLine validatePolicy) $ rs
   putStr "[Day 2-2] # valid passwords: "
-  print . length . filter (==True) . fmap (validateLine validateCorrectPolicy) $ rs
+  print . length . filter (== True) . fmap (validateLine validateCorrectPolicy) $ rs