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41 lines
1.1 KiB
Haskell
41 lines
1.1 KiB
Haskell
#!/usr/bin/env stack
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{- stack runghc --verbosity info
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--package pandoc
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-}
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-- Remove a table of contents marker
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-- (a bullet list item containing "toc[-N[-M]]")
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{-# LANGUAGE OverloadedStrings #-}
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import Data.Char (isDigit)
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import Data.List.Split
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import Data.Maybe
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import Safe
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import Text.Pandoc.JSON
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main :: IO ()
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main = toJSONFilter dropToc
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dropHtmlBlocks :: Block -> Block
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dropHtmlBlocks (RawBlock (Format "html") _) = Plain []
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dropHtmlBlocks x = x
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-- BulletList
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-- [ [Plain [Str "toc"]] ]
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dropToc :: Block -> Block
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dropToc (BulletList is) =
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BulletList $ filter (not.null) $ map (filter isNotToc) is
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where
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isNotToc (Plain [Str s]) | isJust $ tocParams s = False
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isNotToc _ = True
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dropToc x = x
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tocParams :: String -> Maybe (Maybe Int, Maybe Int)
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tocParams s =
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case splitOn "-" s of
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["toc"] -> Just (Nothing, Nothing)
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["toc",a] | all isDigit a -> Just (Nothing, readMay a)
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["toc",a,b] | all isDigit a, all isDigit b -> Just (readMay a, readMay b)
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_ -> Nothing
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