Expand \newenvironment macros.

Closes #987.

Depends on still unreleased texmath 0.9.3.

pandoc.cabal

@@ -269,7 +269,7 @@ Library
                  text >= 0.11 && < 1.3,
                  zip-archive >= 0.2.3.4 && < 0.4,
                  HTTP >= 4000.0.5 && < 4000.4,
-                 texmath >= 0.9 && < 0.10,
+                 texmath >= 0.9.3 && < 0.10,
                  xml >= 1.3.12 && < 1.4,
                  random >= 1 && < 1.2,
                  extensible-exceptions >= 0.1 && < 0.2,

src/Text/Pandoc/Readers/LaTeX.hs

@@ -971,17 +971,19 @@ rawEnv name = do
   let parseRaw = extensionEnabled Ext_raw_tex exts
   rawOptions <- mconcat <$> many rawopt
   let beginCommand = "\\begin{" ++ name ++ "}" ++ rawOptions
-  unless parseRaw $ do
-    pos1 <- getPosition
-    report $ SkippedContent beginCommand pos1
+  pos1 <- getPosition
   (bs, raw) <- withRaw $ env name blocks
-  raw' <- applyMacros' raw
-  if parseRaw
-     then return $ rawBlock "latex" $ beginCommand ++ raw'
-     else do
-       pos2 <- getPosition
-       report $ SkippedContent ("\\end{" ++ name ++ "}") pos2
-       return bs
+  raw' <- applyMacros' $ beginCommand ++ raw
+  if raw' /= beginCommand ++ raw
+     then parseFromString blocks raw'
+     else if parseRaw
+          then return $ rawBlock "latex" $ beginCommand ++ raw'
+          else do
+            unless parseRaw $ do
+              report $ SkippedContent beginCommand pos1
+            pos2 <- getPosition
+            report $ SkippedContent ("\\end{" ++ name ++ "}") pos2
+            return bs
 
 ----
 

test/command/987.md

@@ -0,0 +1,12 @@
+```
+pandoc -f latex -t markdown
+\documentclass{article}
+\newenvironment{flubble}{FOO}{BAR}
+\begin{document}
+   \begin{flubble}
+   grr
+   \end{flubble}
+\end{document}
+^D
+FOO grr BAR
+```