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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.RelativizeUrls
( relativizeUrlsCompiler
, relativizeUrls
) where
import Prelude hiding (id)
import Control.Category (id)
import Control.Arrow ((&&&), (>>^))
import Data.List (isPrefixOf)
import qualified Data.Set as S
import Text.HTML.TagSoup
import Hakyll.Core.Compiler
import Hakyll.Web.Page
import Hakyll.Web.Util.String
-- | Compiler form of 'compressCss' which automatically picks the right root
-- path
--
relativizeUrlsCompiler :: Compiler (Page String) (Page String)
relativizeUrlsCompiler = getRoute &&& id >>^ uncurry relativize
where
relativize Nothing = id
relativize (Just r) = fmap (relativizeUrls $ toSiteRoot r)
-- | Relativize URL's in HTML
--
relativizeUrls :: String -- ^ Path to the site root
-> String -- ^ HTML to relativize
-> String -- ^ Resulting HTML
relativizeUrls root = renderTags . map relativizeUrls' . parseTags
where
relativizeUrls' (TagOpen s a) = TagOpen s $ map (relativizeUrlsAttrs root) a
relativizeUrls' x = x
-- | Relativize URL's in attributes
--
relativizeUrlsAttrs :: String -- ^ Path to the site root
-> Attribute String -- ^ Attribute to relativize
-> Attribute String -- ^ Resulting attribute
relativizeUrlsAttrs root (key, value)
| key `S.member` urls && "/" `isPrefixOf` value = (key, root ++ value)
| otherwise = (key, value)
where
urls = S.fromList ["src", "href"]
|
