Treat div with class "notes" as speaker notes in slide formats.

Currently beamer goes to `\note{}`, revealjs to `<aside class="notes">`,
and the notes are simply suppressed in other formats.

Closes #925.

2 files changed, 15 insertions, 3 deletions

diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index cee07cff5..22f5b8074 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -421,9 +421,16 @@ blockToHtml opts (Para [Image txt (s,'f':'i':'g':':':tit)]) = do
 blockToHtml opts (Para lst) = do
   contents <- inlineListToHtml opts lst
   return $ H.p contents
-blockToHtml opts (Div attr bs) = do
+blockToHtml opts (Div attr@(_,classes,_) bs) = do
   contents <- blockListToHtml opts bs
-  return $ addAttrs opts attr $ H.div $ nl opts >> contents >> nl opts
+  let contents' = nl opts >> contents >> nl opts
+  return $
+     if "notes" `elem` classes
+        then case writerSlideVariant opts of
+                  RevealJsSlides -> addAttrs opts attr $ H5.aside $ contents'
+                  NoSlides       -> addAttrs opts attr $ H.div $ contents'
+                  _              -> mempty
+        else addAttrs opts attr $ H.div $ contents'
 blockToHtml _ (RawBlock f str)
   | f == Format "html" = return $ preEscapedString str
   | otherwise          = return mempty
diff --git a/src/Text/Pandoc/Writers/LaTeX.hs b/src/Text/Pandoc/Writers/LaTeX.hs
index 8b05cfb43..d31e33a3a 100644
--- a/src/Text/Pandoc/Writers/LaTeX.hs
+++ b/src/Text/Pandoc/Writers/LaTeX.hs
@@ -285,7 +285,12 @@ isLineBreakOrSpace _ = False
 blockToLaTeX :: Block     -- ^ Block to convert
              -> State WriterState Doc
 blockToLaTeX Null = return empty
-blockToLaTeX (Div _ bs) = blockListToLaTeX bs
+blockToLaTeX (Div (_,classes,_) bs) = do
+  beamer <- writerBeamer `fmap` gets stOptions
+  contents <- blockListToLaTeX bs
+  if beamer && "notes" `elem` classes  -- speaker notes
+     then return $ "\\note" <> braces contents
+     else return contents
 blockToLaTeX (Plain lst) =
   inlineListToLaTeX $ dropWhile isLineBreakOrSpace lst
 -- title beginning with fig: indicates that the image is a figure