haskell: add more katas

haskell/12_unique_in_order.hs

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+module UniqueInOrder (uniqueInOrder) where
+
+import Data.List (head, group)
+
+uniqueInOrder :: Eq a => [a] -> [a]
+uniqueInOrder = map head . group

haskell/13_weight_for_weight.hs

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+module Codewars.G964.WeightSort where
+
+import           Data.Char (digitToInt)
+import           Data.List (sortBy)
+import           Data.Ord  (comparing)
+
+orderWeight :: [Char] -> [Char]
+orderWeight = unwords . sortBy cmpWeights . words
+
+cmpWeights :: [Char] -> [Char] -> Ordering
+cmpWeights = comparing weights
+
+weights :: [Char] -> (Int, [Char])
+weights s = (sum . map digitToInt $ s, s)

haskell/fundamentals/1_total_amount_of_points.hs

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+{-
+Our football team finished the championship. The result of each match look like "x:y". Results of all matches are recorded in the collection.
+
+For example: ["3:1", "2:2", "0:1", ...]
+
+Write a function that takes such collection and counts the points of our team in the championship. Rules for counting points for each match:
+
+
+    if x > y: 3 points
+    if x < y: 0 point
+    if x = y: 1 point
+
+Notes:
+
+    there are 10 matches in the championship
+    0 <= x <= 4
+    0 <= y <= 4
+
+-}
+
+module TotalPoints where
+
+import           Data.Char (isDigit)
+
+points :: [String] -> Int
+points = sum . map (counting . nums)
+
+counting :: (Int, Int) -> Int
+counting t
+  | uncurry (>) t = 3
+  | uncurry (<) t = 0
+  | otherwise = 1
+
+nums :: String -> (Int, Int)
+nums chars = (read c1, read c2)
+  where
+    c1, c2 :: String
+    c2 = drop ((+1) $ length c1) chars
+    c1 = takeWhile isDigit chars
+
+{-
+module TotalPointsSpec where
+import TotalPoints
+import Test.Hspec
+
+spec = do
+  describe "Total amount of points" $ do
+    it "Basic tests" $ do
+      points ["1:0","2:0","3:0","4:0","2:1","3:1","4:1","3:2","4:2","4:3"] `shouldBe` 30
+      points ["1:1","2:2","3:3","4:4","2:2","3:3","4:4","3:3","4:4","4:4"] `shouldBe` 10
+      points ["0:1","0:2","0:3","0:4","1:2","1:3","1:4","2:3","2:4","3:4"] `shouldBe` 0
+      points ["1:0","2:0","3:0","4:0","2:1","1:3","1:4","2:3","2:4","3:4"] `shouldBe` 15
+      points ["1:0","2:0","3:0","4:4","2:2","3:3","1:4","2:3","2:4","3:4"] `shouldBe` 12
+-}