From ef4bc58cc1b2ce8226cfe3449eb188734dcb5c51 Mon Sep 17 00:00:00 2001
From: Alexander Krotov <ilabdsf@gmail.com>
Date: Fri, 5 Oct 2018 12:37:41 +0300
Subject: Muse reader: simplify verse parsers

---
 src/Text/Pandoc/Readers/Muse.hs | 25 +++++++------------------
 1 file changed, 7 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/Text/Pandoc/Readers/Muse.hs b/src/Text/Pandoc/Readers/Muse.hs
index d5236c5a2..c3b8ea25f 100644
--- a/src/Text/Pandoc/Readers/Muse.hs
+++ b/src/Text/Pandoc/Readers/Muse.hs
@@ -453,10 +453,9 @@ playTag = do
   fmap (B.divWith ("", ["play"], [])) . snd <$> parseHtmlContent "play"
 
 verseLine :: PandocMonad m => MuseParser m (F Inlines)
-verseLine = do
-  indent <- (B.str <$> many1 ('\160' <$ char ' ')) <|> pure mempty
-  rest <- manyTill inline' newline
-  return $ trimInlinesF $ mconcat (pure indent : rest)
+verseLine = (<>)
+  <$> fmap pure (option mempty (B.str <$> many1 ('\160' <$ char ' ')))
+  <*> fmap (trimInlinesF . mconcat) (manyTill inline' eol)
 
 -- | Parse @\<verse>@ tag.
 verseTag :: PandocMonad m => MuseParser m (F Blocks)
@@ -541,26 +540,16 @@ emacsNoteBlock = try $ do
 -- Verse markup
 --
 
-lineVerseLine :: PandocMonad m => MuseParser m (F Inlines)
-lineVerseLine = try $ do
-  string "> "
-  indent <- many ('\160' <$ char ' ')
-  let indentEl = if null indent then mempty else B.str indent
-  rest <- manyTill inline' eol
-  return $ trimInlinesF $ mconcat (pure indentEl : rest)
-
-blanklineVerseLine :: PandocMonad m => MuseParser m (F Inlines)
-blanklineVerseLine = try $ mempty
-  <$ char '>'
-  <* blankline
-
 -- | Parse a line block indicated by @\'>\'@ characters.
 lineBlock :: PandocMonad m => MuseParser m (F Blocks)
 lineBlock = try $ do
   many spaceChar
   col <- sourceColumn <$> getPosition
-  lns <- (blanklineVerseLine <|> lineVerseLine) `sepBy1'` try (indentWith (col - 1))
+  lns <- (blankVerseLine <|> nonblankVerseLine) `sepBy1'` try (indentWith (col - 1))
   return $ B.lineBlock <$> sequence lns
+  where
+    blankVerseLine = try $ mempty <$ char '>' <* blankline
+    nonblankVerseLine = try (string "> ") *> verseLine
 
 -- *** List parsers
 
-- 
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