mirror of
https://github.com/simonmichael/hledger.git
synced 2024-09-20 02:37:12 +03:00
122 lines
3.9 KiB
Haskell
122 lines
3.9 KiB
Haskell
#!/usr/bin/env stack
|
|
{- stack runghc --verbosity info
|
|
--package pandoc
|
|
-}
|
|
-- Replace a table of contents marker
|
|
-- (a bullet list item containing "toc[-N[-M]]")
|
|
-- with a table of contents based on headings.
|
|
-- toc means full contents, toc-N means contents to depth N
|
|
-- and toc-N-M means contents from depth N to depth M.
|
|
-- Based on code from https://github.com/blaenk/blaenk.github.io
|
|
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
|
|
import Data.Char (isDigit)
|
|
import Data.List (groupBy)
|
|
import Data.List.Split
|
|
import Data.Tree (Forest, Tree(Node))
|
|
import Data.Monoid ((<>), mconcat)
|
|
import Data.Function (on)
|
|
import Data.Maybe (fromMaybe)
|
|
import Safe
|
|
import Text.Blaze.Html (preEscapedToHtml, (!))
|
|
import Text.Blaze.Html.Renderer.String (renderHtml)
|
|
import qualified Text.Blaze.Html5 as H
|
|
import qualified Text.Blaze.Html5.Attributes as A
|
|
import Text.Pandoc
|
|
import Text.Pandoc.JSON
|
|
import Text.Pandoc.Walk (walk, query)
|
|
|
|
main :: IO ()
|
|
main = toJSONFilter tableOfContents
|
|
|
|
tableOfContents :: Pandoc -> Pandoc
|
|
tableOfContents doc =
|
|
let headers = query collectHeaders doc
|
|
in walk (generateTOC headers) doc
|
|
|
|
collectHeaders :: Block -> [Block]
|
|
collectHeaders header@(Header _ (_, classes, _) _)
|
|
| "notoc" `elem` classes = []
|
|
| otherwise = [header]
|
|
collectHeaders _ = []
|
|
|
|
generateTOC :: [Block] -> Block -> Block
|
|
generateTOC [] x = x
|
|
generateTOC headers x@(BulletList (( (( Plain ((Str txt):_)):_)):_)) =
|
|
case tocParams txt of
|
|
Just (mstartlevel, mendlevel) ->
|
|
render .
|
|
forestDrop mstartlevel .
|
|
forestPrune mendlevel .
|
|
groupByHierarchy $
|
|
headers -- (! A.class_ "right-toc") .
|
|
where
|
|
render = (RawBlock "html") . renderHtml . createTable
|
|
Nothing -> x
|
|
generateTOC _ x = x
|
|
|
|
tocParams :: String -> Maybe (Maybe Int, Maybe Int)
|
|
tocParams s =
|
|
case splitOn "-" s of
|
|
["toc"] -> Just (Nothing, Nothing)
|
|
["toc",a] | all isDigit a -> Just (Nothing, readMay a)
|
|
["toc",a,b] | all isDigit a, all isDigit b -> Just (readMay a, readMay b)
|
|
_ -> Nothing
|
|
|
|
forestDrop :: Maybe Int -> Forest a -> Forest a
|
|
forestDrop Nothing f = f
|
|
forestDrop (Just n) ts = concatMap (treeDrop n) ts
|
|
|
|
treeDrop :: Int -> Tree a -> Forest a
|
|
treeDrop n t | n < 1 = [t]
|
|
treeDrop n (Node _ ts) = concatMap (treeDrop (n-1)) ts
|
|
|
|
forestPrune :: Maybe Int -> Forest a -> Forest a
|
|
forestPrune Nothing f = f
|
|
forestPrune (Just n) ts = map (treePrune n) ts
|
|
|
|
treePrune :: Int -> Tree a -> Tree a
|
|
treePrune n t | n < 1 = t
|
|
treePrune n (Node v ts) = Node v $ map (treePrune (n-1)) ts
|
|
|
|
-- | remove all nodes past a certain depth
|
|
-- treeprune :: Int -> Tree a -> Tree a
|
|
-- treeprune 0 t = Node (root t) []
|
|
-- treeprune d t = Node (root t) (map (treeprune $ d-1) $ branches t)
|
|
|
|
groupByHierarchy :: [Block] -> Forest Block
|
|
groupByHierarchy = map (\(x:xs) -> Node x (groupByHierarchy xs)) . groupBy ((<) `on` headerLevel)
|
|
|
|
headerLevel :: Block -> Int
|
|
headerLevel (Header level _ _) = level
|
|
headerLevel _ = error "not a header"
|
|
|
|
createTable :: Forest Block -> H.Html
|
|
createTable headers =
|
|
(H.nav ! A.id "toc") $ do
|
|
H.p "Contents"
|
|
H.ol $ markupHeaders headers
|
|
|
|
markupHeader :: Tree Block -> H.Html
|
|
markupHeader (Node (Header _ (ident, _, keyvals) inline) headers)
|
|
| headers == [] = H.li $ link
|
|
| otherwise = H.li $ link <> (H.ol $ markupHeaders headers)
|
|
where render x = writeHtmlString def (Pandoc nullMeta [(Plain x)])
|
|
section = fromMaybe (render inline) (lookup "toc" keyvals)
|
|
link = H.a ! A.href (H.toValue $ "#" ++ ident) $ preEscapedToHtml section
|
|
markupHeader _ = error "what"
|
|
|
|
markupHeaders :: Forest Block -> H.Html
|
|
markupHeaders = mconcat . map markupHeader
|
|
|
|
-- ignoreTOC :: Block -> Block
|
|
-- ignoreTOC (Header level (ident, classes, params) inline) =
|
|
-- Header level (ident, "notoc" : classes, params) inline
|
|
-- ignoreTOC x = x
|
|
|
|
-- removeTOCMarker :: Block -> Block
|
|
-- removeTOCMarker (BulletList (( (( Plain ((Str "toc"):_)):_)):_)) = Null
|
|
-- removeTOCMarker x = x
|
|
|