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module Text.Hakyll.Util
( trim,
split,
stripHTML
) where
import Data.Char
import Data.List
-- | Trim a string (drop spaces and tabs at both sides).
trim :: String -> String
trim = reverse . trim' . reverse . trim'
where trim' = dropWhile isSpace
-- | Strip html tags.
stripHTML :: String -> String
stripHTML [] = []
stripHTML str = let (beforeTag, rest) = break (== '<') str
(_, afterTag) = break (== '>') rest
in beforeTag ++ (stripHTML $ tail' afterTag)
-- We need a failsafe tail function.
where tail' [] = []
tail' xs = tail xs
-- | Split a list at a certain element.
split :: (Eq a) => a -> [a] -> [[a]]
split element = unfoldr splitOnce
where splitOnce l = let r = break (== element) l
in case r of ([], []) -> Nothing
(x, xs) -> if null xs
then Just (x, [])
else Just (x, tail xs)
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