aoc2020/common/AoC.hs

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module AoC
( (.:)
, oneCompleteResult
, splitOnEmptyLines
, runAoC
)
where
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import Data.Function (on)
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import Data.List (groupBy)
import Text.ParserCombinators.ReadP
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(.:) :: (c -> d) -> (a -> b -> c) -> a -> b -> d
f .: g = (f .) . g
infixl 8 .:
oneCompleteResult :: ReadP a -> String -> Maybe a
oneCompleteResult p s = case readP_to_S (p <* eof) s of
[(x, "")] -> Just x
_ -> Nothing
splitOnEmptyLines :: String -> [[String]]
splitOnEmptyLines = filter (not . any null) . groupBy ((==) `on` null) . lines
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runAoC :: (Show r1, Show r2) => (String -> i) -> (i -> r1) -> (i -> r2) -> IO ()
runAoC inputTransform part1 part2 = do
contents <- inputTransform <$> getContents
print $ part1 contents
print $ part2 contents