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--------------------------------------------------------------------------------
-- | This module exposes a function which can relativize URL's on a webpage.
--
-- This means that one can deploy the resulting site on
-- @http:\/\/example.com\/@, but also on @http:\/\/example.com\/some-folder\/@
-- without having to change anything (simply copy over the files).
--
-- To use it, you should use absolute URL's from the site root everywhere. For
-- example, use
--
-- > <img src="/images/lolcat.png" alt="Funny zomgroflcopter" />
--
-- in a blogpost. When running this through the relativize URL's module, this
-- will result in (suppose your blogpost is located at @\/posts\/foo.html@:
--
-- > <img src="../images/lolcat.png" alt="Funny zomgroflcopter" />
module Hakyll.Web.Html.RelativizeUrls
( relativizeUrls
, relativizeUrlsWith
) where
--------------------------------------------------------------------------------
import Data.List (isPrefixOf)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler
import Hakyll.Core.Item
import Hakyll.Web.Html
--------------------------------------------------------------------------------
-- | Compiler form of 'relativizeUrls' which automatically picks the right root
-- path
relativizeUrls :: Item String -> Compiler (Item String)
relativizeUrls item = do
route <- getRoute $ itemIdentifier item
return $ case route of
Nothing -> item
Just r -> fmap (relativizeUrlsWith $ toSiteRoot r) item
--------------------------------------------------------------------------------
-- | Relativize URL's in HTML
relativizeUrlsWith :: String -- ^ Path to the site root
-> String -- ^ HTML to relativize
-> String -- ^ Resulting HTML
relativizeUrlsWith root = withUrls rel
where
isRel x = "/" `isPrefixOf` x && not ("//" `isPrefixOf` x)
rel x = if isRel x then root ++ x else x
|
