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hakyll-std/TableOfContents: add markupLink to do link rendering using Pandoc

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Everett Hildenbrandt 2018-04-27 09:42:52 -06:00 committed by Simon Michael
parent f1a43465b3
commit 00d1944a27
1 changed files with 10 additions and 7 deletions
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17
site/hakyll-std/TableOfContents.hs
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@ -13,7 +13,10 @@ module TableOfContents (
import Text.Pandoc
import Text.Pandoc.Walk (walk, query)
import Text.Pandoc.Class (runPure)
import Text.Pandoc.Builder (text, toList)
import Text.Pandoc.Options (def)
import Data.Either (fromRight)
import Data.List (groupBy)
import Data.Text (unpack)
import Data.Tree (Forest, Tree(Node))
@ -50,16 +53,16 @@ collectHeaders _ = []
groupByHierarchy :: [Block] -> Forest Block
groupByHierarchy = map (\(x:xs) -> Node x (groupByHierarchy xs)) . groupBy ((<) `on` headerLevel)
markupLink :: Attr -> [Inline] -> Inline
markupLink (headerId, _, headerProperties) headerText
= let linkText = fromMaybe headerText (fmap (toList . text) $ lookup "toc" headerProperties)
in Link nullAttr linkText (("#" ++ headerId), headerId)
markupHeader :: Tree Block -> H.Html
markupHeader n@(Node (Header _ (ident, _, keyvals) inlines) headers)
markupHeader n@(Node (Header _ hAttr hText) headers)
| headers == [] = H.li $ link
| otherwise = H.li $ link <> (H.ol $ markupHeaders headers)
where render x = case runPure $ writeHtml5String def (Pandoc nullMeta [(Plain x)]) of
Left _ -> error $ "Error building header.\n"
++ " saw: " ++ show n
Right txt -> txt
section = fromMaybe (unpack $ render inlines) (lookup "toc" keyvals)
link = H.a ! A.href (H.toValue $ "#" ++ ident) $ preEscapedToHtml section
where link = fromRight mempty . runPure . writeHtml5 def $ Pandoc nullMeta [Plain [markupLink hAttr hText]]
markupHeader n = error $ "'markupHeader' should only be passed a 'Node $ Header'\n"
++ " saw: " ++ show n