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|
{-# LANGUAGE OverloadedStrings
#-}
module Links
( extractLinks
, findLinks
, buildBacklinkSet
) where
import Control.Monad.IO.Class (liftIO)
import Data.Default (def)
import qualified Data.Map as M
import Data.Set (Set)
import qualified Data.Set as S
import Data.Text (Text)
import Data.Text.Compat (PandocStr, conv, from)
import qualified Data.Text.IO as T
import System.FilePath (joinPath, (</>))
import Text.Pandoc (PandocIO, readVimwiki)
import Text.Pandoc.Definition (Pandoc, Inline (Link))
import Text.Pandoc.Walk (query)
-- Find all wikilinks in the given document
extractLinks :: Pandoc -> [PandocStr]
extractLinks = query extractLink
where extractLink :: Inline -> [PandocStr]
extractLink (Link _ _ (target, "wikilink")) = [conv target]
extractLink _ = []
findLinks :: FilePath -> [FilePath] -> PandocIO (FilePath, [Text])
findLinks wiki_root parts = do
let item_path = joinPath parts
let inTarget = wiki_root </> item_path
text <- liftIO $ T.readFile inTarget
pandoc <- readVimwiki def text
return (item_path, from <$> extractLinks pandoc)
-- let htmlString = toStrict . renderHtml $ html
-- liftIO $ T.writeFile outTarget htmlString
buildBacklinkSet :: FilePath -> [Text] -> M.Map Text (Set FilePath)
buildBacklinkSet source targets = foldr (M.alter f) M.empty targets
where f Nothing = Just $ S.singleton source
f (Just lst) = Just $ S.insert source lst
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