Org reader: honor tex export option

The `tex` export option can be set with `#+OPTION: tex:nil` and allows
three settings:

 - `t` causes LaTeX fragments to be parsed as TeX or added as raw TeX,
 - `nil` removes all LaTeX fragments from the document, and
 - `verbatim` treats LaTeX as text.

The default is `t`.

Closes: #4070

1 files changed, 17 insertions, 10 deletions

diff --git a/src/Text/Pandoc/Readers/Org/Inlines.hs b/src/Text/Pandoc/Readers/Org/Inlines.hs
index 1055cd0db..d589dd042 100644
--- a/src/Text/Pandoc/Readers/Org/Inlines.hs
+++ b/src/Text/Pandoc/Readers/Org/Inlines.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedStrings #-}
 {- |
    Module      : Text.Pandoc.Readers.Org.Inlines
@@ -788,15 +789,17 @@ simpleSubOrSuperText = try $ do
 inlineLaTeX :: PandocMonad m => OrgParser m (F Inlines)
 inlineLaTeX = try $ do
   cmd <- inlineLaTeXCommand
-  ils <- (lift . lift) $ parseAsInlineLaTeX cmd
+  texOpt <- getExportSetting exportWithLatex
+  ils <- parseAsInlineLaTeX cmd texOpt
   maybe mzero returnF $
-     parseAsMathMLSym cmd `mplus` parseAsMath cmd `mplus` ils
+     parseAsMathMLSym cmd `mplus` parseAsMath cmd texOpt `mplus` ils
  where
-   parseAsMath :: Text -> Maybe Inlines
-   parseAsMath cs = B.fromList <$> texMathToPandoc cs
-
-   parseAsInlineLaTeX :: PandocMonad m => Text -> m (Maybe Inlines)
-   parseAsInlineLaTeX cs = maybeRight <$> runParserT inlineCommand state "" cs
+   parseAsInlineLaTeX :: PandocMonad m
+                      => Text -> TeXExport -> OrgParser m (Maybe Inlines)
+   parseAsInlineLaTeX cs = \case
+     TeXExport -> maybeRight <$> runParserT inlineCommand state "" cs
+     TeXIgnore -> return (Just mempty)
+     TeXVerbatim -> return (Just $ B.str cs)
 
    parseAsMathMLSym :: Text -> Maybe Inlines
    parseAsMathMLSym cs = B.str <$> MathMLEntityMap.getUnicode (clean cs)
@@ -807,8 +810,12 @@ inlineLaTeX = try $ do
    state = def{ stateOptions = def{ readerExtensions =
                     enableExtension Ext_raw_tex (readerExtensions def) } }
 
-   texMathToPandoc :: Text -> Maybe [Inline]
-   texMathToPandoc cs = maybeRight (readTeX cs) >>= writePandoc DisplayInline
+   parseAsMath :: Text -> TeXExport -> Maybe Inlines
+   parseAsMath cs = \case
+     TeXExport -> maybeRight (readTeX cs) >>=
+                  fmap B.fromList . writePandoc DisplayInline
+     TeXIgnore -> Just mempty
+     TeXVerbatim -> Just $ B.str cs
 
 maybeRight :: Either a b -> Maybe b
 maybeRight = either (const Nothing) Just
@@ -820,7 +827,7 @@ inlineLaTeXCommand = try $ do
   parsed <- (lift . lift) $ runParserT rawLaTeXInline st "source" rest
   case parsed of
     Right cs -> do
-      -- drop any trailing whitespace, those are not be part of the command as
+      -- drop any trailing whitespace, those are not part of the command as
       -- far as org mode is concerned.
       let cmdNoSpc = T.dropWhileEnd isSpace cs
       let len = T.length cmdNoSpc