Support images with wikilink syntax.

E.g. `![[foo|bar]]`.  (This requires enabling one of the `wikilinks`
extensions.)

Closes #8853.

src/Text/Pandoc/Readers/Markdown.hs

@@ -1527,7 +1527,7 @@ inline = do
      '_'     -> strongOrEmph
      '*'     -> strongOrEmph
      '^'     -> superscript <|> inlineNote -- in this order bc ^[link](/foo)^
-     '['     -> note <|> cite <|> bracketedSpan <|> wikilink <|> link
+     '['     -> note <|> cite <|> bracketedSpan <|> wikilink B.linkWith <|> link
      '!'     -> image
      '$'     -> math
      '~'     -> strikeout <|> subscript
@@ -1844,8 +1844,10 @@ source = do
 linkTitle :: PandocMonad m => MarkdownParser m Text
 linkTitle = quotedTitle '"' <|> quotedTitle '\''
 
-wikilink :: PandocMonad m => MarkdownParser m (F Inlines)
-wikilink =
+wikilink :: PandocMonad m
+  => (Attr -> Text -> Text -> Inlines -> Inlines)
+  -> MarkdownParser m (F Inlines)
+wikilink constructor =
   (guardEnabled Ext_wikilinks_title_after_pipe *> wikilink' swap) <|>
   (guardEnabled Ext_wikilinks_title_before_pipe *> wikilink' id)
   where
@@ -1857,7 +1859,7 @@ wikilink =
       let (title, url) = case T.break (== '|') raw of
             (before, "") -> (before, before)
             (before, after) -> order (before, T.drop 1 after)
-      return . pure . B.link url "wikilink" $ B.str title
+      return . pure . constructor nullAttr url "wikilink" $ B.str title
 
 link :: PandocMonad m => MarkdownParser m (F Inlines)
 link = try $ do
@@ -2015,14 +2017,15 @@ rebasePath pos path = do
 image :: PandocMonad m => MarkdownParser m (F Inlines)
 image = try $ do
   char '!'
-  (lab,raw) <- reference
-  defaultExt <- getOption readerDefaultImageExtension
-  let constructor attr' src =
-         case takeExtension (T.unpack src) of
-            "" -> B.imageWith attr' (T.pack $ addExtension (T.unpack src)
-                                            $ T.unpack defaultExt)
-            _  -> B.imageWith attr' src
-  regLink constructor lab <|> referenceLink constructor (lab, "!" <> raw)
+  wikilink B.imageWith <|>
+    do (lab,raw) <- reference
+       defaultExt <- getOption readerDefaultImageExtension
+       let constructor attr' src =
+              case takeExtension (T.unpack src) of
+                 "" -> B.imageWith attr' (T.pack $ addExtension (T.unpack src)
+                                                 $ T.unpack defaultExt)
+                 _  -> B.imageWith attr' src
+       regLink constructor lab <|> referenceLink constructor (lab, "!" <> raw)
 
 note :: PandocMonad m => MarkdownParser m (F Inlines)
 note = try $ do

test/command/8853.md

@@ -0,0 +1,6 @@
+```
+% pandoc -f markdown+wikilinks_title_after_pipe --wrap=none
+[[hi]] and ![[hi]]
+^D
+<p><a href="hi" title="wikilink">hi</a> and <img src="hi" title="wikilink" alt="hi" /></p>
+```