RST writer: Use `.. code:: language` for code blocks with language.

Closes #721.
Also fixed whitespace in lhs tests.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/Text/Pandoc/Writers/RST.hs b/src/Text/Pandoc/Writers/RST.hs
index 89acd2ef5..78b8fcd73 100644
--- a/src/Text/Pandoc/Writers/RST.hs
+++ b/src/Text/Pandoc/Writers/RST.hs
@@ -177,7 +177,12 @@ blockToRST (CodeBlock (_,classes,_) str) = do
   if "haskell" `elem` classes && "literate" `elem` classes &&
                   isEnabled Ext_literate_haskell opts
      then return $ prefixed "> " (text str) $$ blankline
-     else return $ "::" $+$ nest tabstop (text str) $$ blankline
+     else return $
+          (case [c | c <- classes,
+                     c `notElem` ["sourceCode","literate","numberLines"]] of
+             []       -> "::"
+             (lang:_) -> ".. code:: " <> text lang)
+          $+$ nest tabstop (text str) $$ blankline
 blockToRST (BlockQuote blocks) = do
   tabstop <- get >>= (return . writerTabStop . stOptions)
   contents <- blockListToRST blocks