17 lines
581 B
Haskell
17 lines
581 B
Haskell
import Text.Pandoc.Definition
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import qualified Data.Map.Strict as Map
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import Text.Pandoc.JSON
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import Misc
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-- | replaces the @date@ field, which starts in YYYY-MM-DD format, with
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-- something prettier
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main :: IO ()
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main = toJSONFilter \(Pandoc (Meta m) body) -> do
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m' <- Map.alterF reformat "date" m
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pure $ Pandoc (Meta m') body
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reformat :: Maybe MetaValue -> IO (Maybe MetaValue)
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reformat Nothing = pure Nothing
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reformat (Just (toText -> Just txt)) =
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Just . MetaString . showDate <$> parseIsoDate txt
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reformat (Just d) = fail $ "date is\n" <> show d <> "\nwanted a string"
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