Muse reader: paragraph indentation does not indicate nested quote

Muse allows indentation to indicate quotation or alignment,
but only on the top level, not within a <quote> or list.

This patch also simplifies the code by removing museInQuote
and museInList fields from the state structure.
Headers and indented paragraphs are attempted to be parsed
only at the topmost level, instead of aborting parsing with guards.

src/Text/Pandoc/Readers/Muse.hs

@@ -81,8 +81,6 @@ data MuseState = MuseState { museMeta :: F Meta -- ^ Document metadata
                            , museLastStrPos :: Maybe SourcePos -- ^ Position after last str parsed
                            , museLogMessages :: [LogMessage]
                            , museNotes :: M.Map String (SourcePos, F Blocks)
-                           , museInQuote :: Bool
-                           , museInList :: Bool
                            , museInLink :: Bool
                            }
 
@@ -97,8 +95,6 @@ defaultMuseState = MuseState { museMeta = return nullMeta
                              , museLastStrPos = Nothing
                              , museLogMessages = []
                              , museNotes = M.empty
-                             , museInQuote = False
-                             , museInList = False
                              , museInLink = False
                              }
 
@@ -256,11 +252,14 @@ parseBlocks =
   try blockStart <|>
   try paraStart
   where
-    blockStart = do first <- blockElements
+    blockStart = do first <- header <|> blockElements <|> amuseNoteBlock <|> emacsNoteBlock
                     rest <- parseBlocks
                     return $ first B.<> rest
-    paraStart = do (first, rest) <- paraUntil ((mempty <$ eof) <|> blockStart)
-                   return $ first B.<> rest
+    paraStart = do
+      indent <- length <$> many spaceChar
+      (first, rest) <- paraUntil ((mempty <$ eof) <|> blockStart)
+      let first' = if indent >= 2 && indent < 6 then B.blockQuote <$> first else first
+      return $ first' B.<> rest
 
 parseBlock :: PandocMonad m => MuseParser m (F Blocks)
 parseBlock = do
@@ -273,7 +272,6 @@ blockElements :: PandocMonad m => MuseParser m (F Blocks)
 blockElements = choice [ mempty <$ blankline
                        , comment
                        , separator
-                       , header
                        , example
                        , exampleTag
                        , literalTag
@@ -288,8 +286,6 @@ blockElements = choice [ mempty <$ blankline
                        , definitionList
                        , table
                        , commentTag
-                       , amuseNoteBlock
-                       , emacsNoteBlock
                        ]
 
 comment :: PandocMonad m => MuseParser m (F Blocks)
@@ -309,9 +305,7 @@ separator = try $ do
 
 header :: PandocMonad m => MuseParser m (F Blocks)
 header = try $ do
-  st <- museInList <$> getState
-  q <- museInQuote <$> getState
-  getPosition >>= \pos -> guard (not st && not q && sourceColumn pos == 1)
+  getPosition >>= \pos -> guard (sourceColumn pos == 1)
   level <- fmap length $ many1 $ char '*'
   guard $ level <= 5
   spaceChar
@@ -370,13 +364,7 @@ rightTag :: PandocMonad m => MuseParser m (F Blocks)
 rightTag = snd <$> parseHtmlContent "right"
 
 quoteTag :: PandocMonad m => MuseParser m (F Blocks)
-quoteTag = do
-  st <- getState
-  let oldInQuote = museInQuote st
-  setState $ st{ museInQuote = True }
-  res <- snd <$> parseHtmlContent "quote"
-  setState $ st{ museInQuote = oldInQuote }
-  return $ B.blockQuote <$> res
+quoteTag = (fmap B.blockQuote) <$> snd <$> parseHtmlContent "quote"
 
 -- <div> tag is supported by Emacs Muse, but not Amusewiki 2.025
 divTag :: PandocMonad m => MuseParser m (F Blocks)
@@ -408,12 +396,8 @@ paraUntil :: PandocMonad m
           => MuseParser m a
           -> MuseParser m (F Blocks, a)
 paraUntil end = do
-  indent <- length <$> many spaceChar
-  st <- museInList <$> getState
-  let f = if not st && indent >= 2 && indent < 6 then B.blockQuote else id
   (l, e) <- someUntil inline $ try (manyTill spaceChar eol >> end)
-  let p = fmap (f . B.para) $ trimInlinesF $ mconcat l
-  return (p, e)
+  return (fmap (B.para) $ trimInlinesF $ mconcat l, e)
 
 noteMarker :: PandocMonad m => MuseParser m String
 noteMarker = try $ do
@@ -481,18 +465,9 @@ lineBlock = try $ do
 -- lists
 --
 
-withListContext :: PandocMonad m => MuseParser m a -> MuseParser m a
-withListContext p = do
-  state <- getState
-  let oldInList = museInList state
-  setState $ state { museInList = True }
-  parsed <- p
-  updateState (\st -> st { museInList = oldInList })
-  return parsed
-
 listItemContents' :: PandocMonad m => Int -> MuseParser m (F Blocks)
 listItemContents' col =
-  mconcat <$> withListContext (parseBlock `sepBy1` try (skipMany blankline >> indentWith col))
+  mconcat <$> parseBlock `sepBy1` try (skipMany blankline >> indentWith col)
 
 listItemContents :: PandocMonad m => MuseParser m (F Blocks)
 listItemContents = do

test/Tests/Readers/Muse.hs

@@ -252,6 +252,12 @@ tests =
         , "Quote" =:
           "  This is a quotation\n" =?>
           blockQuote (para "This is a quotation")
+        , "Indentation does not indicate quote inside quote tag" =:
+          T.unlines [ "<quote>"
+                    , "  Not a nested quote"
+                    , "</quote>"
+                    ] =?>
+          blockQuote (para "Not a nested quote")
         , "Multiline quote" =:
           T.unlines [ "  This is a quotation"
                     , "  with a continuation"