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-- | Miscellaneous text manipulation functions.
module Text.Hakyll.Util
( trim
, stripHtml
, link
) where
import Data.Char (isSpace)
import Text.Blaze.Html5 ((!), string, stringValue, a)
import Text.Blaze.Html5.Attributes (href)
import Text.Blaze.Renderer.String (renderHtml)
-- | Trim a string (drop spaces, tabs and newlines at both sides).
trim :: String -> String
trim = reverse . trim' . reverse . trim'
where
trim' = dropWhile isSpace
-- | Strip html tags from the given string.
stripHtml :: String -> String
stripHtml [] = []
stripHtml str = let (beforeTag, rest) = break (== '<') str
(_, afterTag) = break (== '>') rest
in beforeTag ++ stripHtml (tail' afterTag)
where
-- We need a failsafe tail function.
tail' [] = []
tail' xs = tail xs
-- | Make a HTML link.
--
-- > link "foo" "bar.html" == "<a href='bar.html'>foo</a>"
link :: String -- ^ Link text.
-> String -- ^ Link destination.
-> String
link text destination = renderHtml $ a ! href (stringValue destination)
$ string text
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