Org reader: allow multiple pipe chars in todo sequences

Additional pipe chars, used to separate "action" state from "no further
action" states, are ignored. E.g., for the following sequence, both
`DONE` and `FINISHED` are states with no further action required.

    #+TODO: UNFINISHED | DONE | FINISHED

Previously, parsing of the todo sequence failed if multiple pipe chars
were included.

Closes: #7014

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

@@ -239,7 +239,7 @@ lineOfInlines = do
 todoSequence :: Monad m => OrgParser m TodoSequence
 todoSequence = try $ do
   todoKws <- todoKeywords
-  doneKws <- optionMaybe $ todoDoneSep *> todoKeywords
+  doneKws <- optionMaybe $ todoDoneSep *> doneKeywords
   newline
   -- There must be at least one DONE keyword. The last TODO keyword is
   -- taken if necessary.
@@ -250,11 +250,17 @@ todoSequence = try $ do
                     (x:xs) -> return $ keywordsToSequence (reverse xs) [x]
 
  where
+   todoKeyword :: Monad m => OrgParser m Text
+   todoKeyword = many1Char nonspaceChar <* skipSpaces
+
    todoKeywords :: Monad m => OrgParser m [Text]
    todoKeywords = try $
-     let keyword = many1Char nonspaceChar <* skipSpaces
+     let endOfKeywords = todoDoneSep <|> void newline
-         endOfKeywords = todoDoneSep <|> void newline
+     in manyTill todoKeyword (lookAhead endOfKeywords)
-     in manyTill keyword (lookAhead endOfKeywords)
+
+   doneKeywords :: Monad m => OrgParser m [Text]
+   doneKeywords = try $
+     manyTill (todoKeyword <* optional todoDoneSep) (lookAhead newline)
 
    todoDoneSep :: Monad m => OrgParser m ()
    todoDoneSep = void . try $ skipSpaces *> char '|' <* skipSpaces1

test/Tests/Readers/Org/Meta.hs

@@ -116,6 +116,16 @@ tests =
       "#+LANGUAGE: de-DE" =?>
       Pandoc (setMeta "lang" (MetaString "de-DE") nullMeta) mempty
 
+    , testGroup "Todo sequences"
+      [ "not included in document" =:
+        "#+todo: WAITING | FINISHED" =?>
+        Pandoc mempty mempty
+
+      , "can contain multiple pipe characters" =:
+        "#+todo: UNFINISHED | RESEARCH | NOTES | CHART\n" =?>
+        Pandoc mempty mempty
+      ]
+
     , testGroup "LaTeX"
       [ "LATEX_HEADER" =:
         "#+latex_header: \\usepackage{tikz}" =?>