diff options
Diffstat (limited to 'src/Text/Pandoc/Readers/Markdown.hs')
| -rw-r--r-- | src/Text/Pandoc/Readers/Markdown.hs | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs index 42d719e28..4790f83ff 100644 --- a/src/Text/Pandoc/Readers/Markdown.hs +++ b/src/Text/Pandoc/Readers/Markdown.hs @@ -254,12 +254,15 @@ yamlMetaBlock = try $ do then return () else do v' <- yamlToMeta v - updateState $ \st -> - let smeta = stateMeta' st - in st{ stateMeta' = - (do v'' <- v' - m <- smeta - return $ B.setMeta (T.unpack k) v'' m)} + let k' = T.unpack k + updateState $ \st -> st{ stateMeta' = + (do m <- stateMeta' st + -- if there's already a value, leave it unchanged + case lookupMeta k' m of + Just _ -> return m + Nothing -> do + v'' <- v' + return $ B.setMeta (T.unpack k) v'' m)} ) alist Right Yaml.Null -> return () Right _ -> do |