AsciiDoc Writer: DisplayMath as asciidoc latexmath block

MANUAL.txt

@@ -3513,7 +3513,7 @@ reStructuredText
   ~ It will be rendered using an [interpreted text role `:math:`].
 
 AsciiDoc
-  ~ It will be rendered as `latexmath:[...]`.
+  ~ It will be rendered as `latexmath:[...]` when inline and `[latexmath]++++....++++` when in display mode.
 
 Texinfo
   ~ It will be rendered inside a `@math` command.

src/Text/Pandoc/Writers/AsciiDoc.hs

@@ -414,7 +414,10 @@ inlineToAsciiDoc _ (Str str) = return $ text $ escapeString str
 inlineToAsciiDoc _ (Math InlineMath str) =
   return $ "latexmath:[$" <> text str <> "$]"
 inlineToAsciiDoc _ (Math DisplayMath str) =
-  return $ "latexmath:[\\[" <> text str <> "\\]]"
+  return $
+      blankline <> "[latexmath]" $$ "++++" $$
+      "\\[" <> text str <> "\\]"
+      $$ "++++" $$ blankline
 inlineToAsciiDoc _ il@(RawInline f s)
   | f == "asciidoc" = return $ text s
   | otherwise         = do

test/writer.asciidoc

@@ -466,7 +466,11 @@ Ellipses…and…and….
 * latexmath:[$223$]
 * latexmath:[$p$]-Tree
 * Here’s some display math:
-latexmath:[\[\frac{d}{dx}f(x)=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}\]]
+
+[latexmath]
+++++
+\[\frac{d}{dx}f(x)=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}\]
+++++
 * Here’s one that has a line break in it:
 latexmath:[$\alpha + \omega \times x^2$].