Add app and tests for formatting

Makefile

@@ -34,4 +34,4 @@ test:
 
 .PHONY: format
 format:
-	${stack} .local/hfmt -w src/
+	${stack} .local/hfmt -w app/ src/ test/

test/PatternSpec.hs

@@ -17,19 +17,19 @@ spec =
     it "matches fixed time" $
       let ptn = "* * * * *"
           date = DateTime 2017 10 11 0 0 0
-      in match ptn date `shouldBe` Just True
+       in match ptn date `shouldBe` Just True
     it "matches all minutes" $
       let ptn = "* * * * *"
           dates = [DateTime 2017 10 11 0 i 0 | i <- [0 .. 59]]
-      in countMatches ptn dates `shouldBe` 60
+       in countMatches ptn dates `shouldBe` 60
     it "matches exactly moment" $
       let date = DateTime 2017 10 11 0 0 0
           ptn = "0 0 11 10 *"
-      in match ptn date `shouldBe` Just True
+       in match ptn date `shouldBe` Just True
     it "matches moment" $
       let date = DateTime 2017 10 10 12 10 0
           ptn = "* 12 * * *"
-      in match ptn date `shouldBe` Just True
+       in match ptn date `shouldBe` Just True
 
 countMatches :: String -> [DateTime] -> Int
 countMatches p xs = sum $ map (f p) xs