Org reader: omit, but warn about unknown export options

Unknown export options are properly ignored and omitted from the output.

3 files changed, 20 insertions, 4 deletions

diff --git a/src/Text/Pandoc/Logging.hs b/src/Text/Pandoc/Logging.hs
index e0a76a076..2fb648b12 100644
--- a/src/Text/Pandoc/Logging.hs
+++ b/src/Text/Pandoc/Logging.hs
@@ -86,6 +86,7 @@ data LogMessage =
   | NoTranslation String
   | CouldNotLoadTranslations String String
   | UnexpectedXmlElement String String
+  | UnknownOrgExportOption String
   deriving (Show, Eq, Data, Ord, Typeable, Generic)
 
 instance ToJSON LogMessage where
@@ -201,6 +202,8 @@ instance ToJSON LogMessage where
       UnexpectedXmlElement element parent ->
            ["element" .= Text.pack element,
             "parent" .= Text.pack parent]
+      UnknownOrgExportOption option ->
+           ["option" .= Text.pack option]
 
 
 showPos :: SourcePos -> String
@@ -300,6 +303,8 @@ showLogMessage msg =
            if null m then "" else '\n' : m
        UnexpectedXmlElement element parent ->
          "Unexpected XML element " ++ element ++ " in " ++ parent
+       UnknownOrgExportOption option ->
+         "Ignoring unknown Org export option: " ++ option
 
 messageVerbosity:: LogMessage -> Verbosity
 messageVerbosity msg =
@@ -339,3 +344,4 @@ messageVerbosity msg =
        NoTranslation{}              -> WARNING
        CouldNotLoadTranslations{}   -> WARNING
        UnexpectedXmlElement {}      -> WARNING
+       UnknownOrgExportOption {}    -> WARNING
diff --git a/src/Text/Pandoc/Readers/Org/ExportSettings.hs b/src/Text/Pandoc/Readers/Org/ExportSettings.hs
index 467c5339d..f783eaa0f 100644
--- a/src/Text/Pandoc/Readers/Org/ExportSettings.hs
+++ b/src/Text/Pandoc/Readers/Org/ExportSettings.hs
@@ -13,6 +13,8 @@ module Text.Pandoc.Readers.Org.ExportSettings
   ) where
 
 import Prelude
+import Text.Pandoc.Class (PandocMonad, report)
+import Text.Pandoc.Logging (LogMessage (UnknownOrgExportOption))
 import Text.Pandoc.Readers.Org.ParserState
 import Text.Pandoc.Readers.Org.Parsing
 
@@ -21,14 +23,14 @@ import Data.Char (toLower)
 import Data.Maybe (listToMaybe)
 
 -- | Read and handle space separated org-mode export settings.
-exportSettings :: Monad m => OrgParser m ()
-exportSettings = void $ sepBy spaces exportSetting
+exportSettings :: PandocMonad m => OrgParser m ()
+exportSettings = void $ sepBy skipSpaces exportSetting
 
 -- | Setter function for export settings.
 type ExportSettingSetter a = a -> ExportSettings -> ExportSettings
 
 -- | Read and process a single org-mode export option.
-exportSetting :: Monad m => OrgParser m ()
+exportSetting :: PandocMonad m => OrgParser m ()
 exportSetting = choice
   [ booleanSetting "^" (\val es -> es { exportSubSuperscripts = val })
   , booleanSetting "'" (\val es -> es { exportSmartQuotes = val })
@@ -63,6 +65,7 @@ exportSetting = choice
   , ignoredSetting "toc"
   , booleanSetting "todo" (\val es -> es { exportWithTodoKeywords = val })
   , ignoredSetting "|"
+  , ignoreAndWarn
   ] <?> "export setting"
 
 genericExportSetting :: Monad m
@@ -144,6 +147,13 @@ complementableListSetting = genericExportSetting $ choice
 ignoredSetting :: Monad m => String -> OrgParser m ()
 ignoredSetting s = try (() <$ string s <* char ':' <* many1 nonspaceChar)
 
+-- | Read any setting string, but ignore it and emit a warning.
+ignoreAndWarn :: PandocMonad m => OrgParser m ()
+ignoreAndWarn = try $ do
+  opt <- many1 nonspaceChar
+  report (UnknownOrgExportOption opt)
+  return ()
+
 -- | Read an elisp boolean.  Only NIL is treated as false, non-NIL values are
 -- interpreted as true.
 elispBoolean :: Monad m => OrgParser m Bool
diff --git a/src/Text/Pandoc/Readers/Org/Meta.hs b/src/Text/Pandoc/Readers/Org/Meta.hs
index bcbc2edab..0a388403e 100644
--- a/src/Text/Pandoc/Readers/Org/Meta.hs
+++ b/src/Text/Pandoc/Readers/Org/Meta.hs
@@ -131,7 +131,7 @@ accumulatingList key p = do
 --
 -- export options
 --
-optionLine :: Monad m => OrgParser m ()
+optionLine :: PandocMonad m => OrgParser m ()
 optionLine = try $ do
   key <- metaKey
   case key of