Org reader: respect export setting which disables entities

MathML-like entities, e.g., `\alpha`, can be disabled with the
`#+OPTION: e:nil` export setting.

src/Text/Pandoc/Readers/Org/ExportSettings.hs

@@ -47,7 +47,7 @@ exportSetting = choice
   , booleanSetting "creator" (\val es -> es { exportWithCreator = val })
   , complementableListSetting "d" (\val es -> es { exportDrawers = val })
   , ignoredSetting "date"
-  , ignoredSetting "e"
+  , booleanSetting "e" (\val es -> es { exportWithEntities = val })
   , booleanSetting "email" (\val es -> es { exportWithEmail = val })
   , ignoredSetting "f"
   , integerSetting "H" (\val es -> es { exportHeadlineLevels = val })

src/Text/Pandoc/Readers/Org/Inlines.hs

@@ -790,9 +790,12 @@ inlineLaTeX :: PandocMonad m => OrgParser m (F Inlines)
 inlineLaTeX = try $ do
   cmd <- inlineLaTeXCommand
   texOpt <- getExportSetting exportWithLatex
+  allowEntities <- getExportSetting exportWithEntities
   ils <- parseAsInlineLaTeX cmd texOpt
   maybe mzero returnF $
-     parseAsMathMLSym cmd `mplus` parseAsMath cmd texOpt `mplus` ils
+     parseAsMathMLSym allowEntities cmd `mplus`
+     parseAsMath cmd texOpt `mplus`
+     ils
  where
    parseAsInlineLaTeX :: PandocMonad m
                       => Text -> TeXExport -> OrgParser m (Maybe Inlines)
@@ -801,10 +804,15 @@ inlineLaTeX = try $ do
      TeXIgnore -> return (Just mempty)
      TeXVerbatim -> return (Just $ B.str cs)
 
-   parseAsMathMLSym :: Text -> Maybe Inlines
+   parseAsMathMLSym :: Bool -> Text -> Maybe Inlines
-   parseAsMathMLSym cs = B.str <$> MathMLEntityMap.getUnicode (clean cs)
+   parseAsMathMLSym allowEntities cs = do
      -- drop initial backslash and any trailing "{}"
-    where clean = T.dropWhileEnd (`elem` ("{}" :: String)) . T.drop 1
+     let clean = T.dropWhileEnd (`elem` ("{}" :: String)) . T.drop 1
+     -- If entities are disabled, then return the string as text, but
+     -- only if this *is* a MathML entity.
+     case B.str <$> MathMLEntityMap.getUnicode (clean cs) of
+       Just _ | not allowEntities -> Just $ B.str cs
+       x -> x
 
    state :: ParserState
    state = def{ stateOptions = def{ readerExtensions =

src/Text/Pandoc/Readers/Org/ParserState.hs

@@ -257,6 +257,7 @@ data ExportSettings = ExportSettings
   , exportWithAuthor       :: Bool -- ^ Include author in final meta-data
   , exportWithCreator      :: Bool -- ^ Include creator in final meta-data
   , exportWithEmail        :: Bool -- ^ Include email in final meta-data
+  , exportWithEntities     :: Bool -- ^ Include MathML-like entities
   , exportWithLatex        :: TeXExport -- ^ Handling of raw TeX commands
   , exportWithPlanning     :: Bool -- ^ Keep planning info after headlines
   , exportWithTags         :: Bool -- ^ Keep tags as part of headlines
@@ -279,6 +280,7 @@ defaultExportSettings = ExportSettings
   , exportWithAuthor = True
   , exportWithCreator = True
   , exportWithEmail = True
+  , exportWithEntities = True
   , exportWithLatex = TeXExport
   , exportWithPlanning = False
   , exportWithTags = True

test/Tests/Readers/Org/Directive.hs

@@ -150,6 +150,12 @@ tests =
                   ] =?>
         Pandoc nullMeta mempty
 
+    , "disable MathML-like entities" =:
+        T.unlines [ "#+OPTIONS: e:nil"
+                  , "Icelandic letter: \\thorn"
+                  ] =?>
+        para "Icelandic letter: \\thorn"
+
     , "disable inclusion of todo keywords" =:
         T.unlines [ "#+OPTIONS: todo:nil"
                   , "** DONE todo export"