From afedb41b170cd9198ab589567f39e99717667a31 Mon Sep 17 00:00:00 2001
From: Alexander Krotov <ilabdsf@gmail.com>
Date: Sun, 10 Sep 2017 12:42:24 +0300
Subject: Muse reader: trim newlines from <example>s

---
 src/Text/Pandoc/Readers/Muse.hs | 11 ++++++++++-
 test/Tests/Readers/Muse.hs      | 25 +++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/Text/Pandoc/Readers/Muse.hs b/src/Text/Pandoc/Readers/Muse.hs
index 3b089772f..f70085c54 100644
--- a/src/Text/Pandoc/Readers/Muse.hs
+++ b/src/Text/Pandoc/Readers/Muse.hs
@@ -223,7 +223,16 @@ header = try $ do
   return $ B.headerWith attr level <$> content
 
 exampleTag :: PandocMonad m => MuseParser m (F Blocks)
-exampleTag = liftM (return . uncurry B.codeBlockWith) $ htmlElement "example"
+exampleTag = do
+  (attr, contents) <- htmlElement "example"
+  return $ return $ B.codeBlockWith attr $ chop contents
+  where lchop s = case s of
+                    '\n':ss -> ss
+                    _ -> s
+        rchop = reverse . lchop . reverse
+        -- Trim up to one newline from the beginning and the end,
+        -- in case opening and/or closing tags are on separate lines.
+        chop = lchop . rchop
 
 literal :: PandocMonad m => MuseParser m (F Blocks)
 literal = liftM (return . rawBlock) $ htmlElement "literal"
diff --git a/test/Tests/Readers/Muse.hs b/test/Tests/Readers/Muse.hs
index 6f602d7c3..43a1d0697 100644
--- a/test/Tests/Readers/Muse.hs
+++ b/test/Tests/Readers/Muse.hs
@@ -230,6 +230,31 @@ tests =
         lineBlock [ "Foo bar" ] <>
         lineBlock [ "Foo bar" ] <>
         lineBlock [ "\160\160\160Foo" ]
+      , testGroup "Example tag"
+        [ "Tags on separate lines" =:
+          T.unlines [ "<example>"
+                    , "Example line"
+                    , "</example>"
+                    ] =?>
+          codeBlock "Example line"
+        , "One line" =:
+          "<example>Example line</example>" =?>
+          codeBlock "Example line"
+        , "One blank line in the beginning" =:
+          T.unlines [ "<example>"
+                    , ""
+                    , "Example line"
+                    , "</example>"
+                    ] =?>
+          codeBlock "\nExample line"
+        , "One blank line in the end" =:
+          T.unlines [ "<example>"
+                    , "Example line"
+                    , ""
+                    , "</example>"
+                    ] =?>
+          codeBlock "Example line\n"
+        ]
       , "Center" =: "<center>Hello, world</center>" =?> para (text "Hello, world")
       , "Right" =: "<right>Hello, world</right>" =?> para (text "Hello, world")
       , testGroup "Comments"
-- 
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