Change deprecated Builder.isNull to null.

src/Text/Pandoc/Readers/DocBook.hs

@@ -758,7 +758,7 @@ getMediaobject e = do
                         Nothing -> return mempty
                         Just z  -> mconcat <$>
                                          mapM parseInline (elContent z)
-  let (capt, title) = if isNull figTitle
+  let (capt, title) = if null figTitle
                          then (getCaption e, "")
                          else (return figTitle, "fig:")
   fmap (imageWith attr imageUrl title) capt

src/Text/Pandoc/Readers/Docx.hs

@@ -576,7 +576,7 @@ bodyPartToBlocks (Paragraph pPr parparts)
       then do modify $ \s -> s { docxDropCap = ils' }
               return mempty
       else do modify $ \s -> s { docxDropCap = mempty }
-              let ils'' = (if isNull prevParaIls then mempty
+              let ils'' = (if null prevParaIls then mempty
                           else prevParaIls <> space) <> ils'
                   handleInsertion = do
                     modify $ \s -> s {docxPrevPara = mempty}
@@ -584,7 +584,7 @@ bodyPartToBlocks (Paragraph pPr parparts)
                     return $ transform $ paraOrPlain ils''
               opts <- asks docxOptions
               case (pChange pPr', readerTrackChanges opts) of
-                  _ | isNull ils'', not (isEnabled Ext_empty_paragraphs opts) ->
+                  _ | null ils'', not (isEnabled Ext_empty_paragraphs opts) ->
                     return mempty
                   (Just (TrackedChange Insertion _), AcceptChanges) ->
                       handleInsertion

src/Text/Pandoc/Readers/HTML.hs

@@ -585,7 +585,7 @@ pBlockQuote = do
 pPlain :: PandocMonad m => TagParser m Blocks
 pPlain = do
   contents <- setInPlain $ trimInlines . mconcat <$> many1 inline
-  if B.isNull contents
+  if null contents
      then return mempty
      else return $ B.plain contents
 
@@ -593,7 +593,7 @@ pPara :: PandocMonad m => TagParser m Blocks
 pPara = do
   contents <- trimInlines <$> pInTags "p" inline
   (do guardDisabled Ext_empty_paragraphs
-      guard (B.isNull contents)
+      guard (null contents)
       return mempty)
     <|> return (B.para contents)
 

src/Text/Pandoc/Readers/LaTeX.hs

@@ -200,7 +200,7 @@ regularSymbol = str . untoken <$> satisfyTok isRegularSymbol
 inlineGroup :: PandocMonad m => LP m Inlines
 inlineGroup = do
   ils <- grouped inline
-  if isNull ils
+  if null ils
      then return mempty
      else return $ spanWith nullAttr ils
           -- we need the span so we can detitlecase bibtex entries;

src/Text/Pandoc/Readers/Markdown.hs

@@ -222,9 +222,9 @@ pandocTitleBlock = try $ do
                  author' <- author
                  date' <- date
                  return $
-                     (if B.isNull title' then id else B.setMeta "title" title')
+                     (if null title' then id else B.setMeta "title" title')
                    . (if null author' then id else B.setMeta "author" author')
-                   . (if B.isNull date' then id else B.setMeta "date" date')
+                   . (if null date' then id else B.setMeta "date" date')
                    $ nullMeta
   updateState $ \st -> st{ stateMeta' = stateMeta' st <> meta' }
 

src/Text/Pandoc/Readers/MediaWiki.hs

@@ -434,7 +434,7 @@ defListItem :: PandocMonad m => MWParser m (Inlines, [Blocks])
 defListItem = try $ do
   terms <- mconcat . intersperse B.linebreak <$> many defListTerm
   -- we allow dd with no dt, or dt with no dd
-  defs  <- if B.isNull terms
+  defs  <- if null terms
               then notFollowedBy
                     (try $ skipMany1 (char ':') >> string "<math>") *>
                        many1 (listItem ':')