RST reader: Line block improvements.

* Use nonbreaking spaces for initial indent (otherwise lost in HTML and
  LaTeX).
* Allow multiple paragraphs in a single line block.

src/Text/Pandoc/Readers/RST.hs

@@ -206,16 +206,21 @@ lineBlockLine = try $ do
   char '|'
   char ' ' <|> lookAhead (char '\n')
   white <- many spaceChar
-  line <- many $ (notFollowedBy newline >> inline) <|> (try $ endline >>~ char ' ')
+  line <- many1 $ (notFollowedBy newline >> inline) <|> (try $ endline >>~ char ' ')
   optional endline
   return $ if null white
               then mconcat line
-              else B.str white <> mconcat line
+              else B.str (spToNbsp white) <> mconcat line
+
+spToNbsp :: String -> String
+spToNbsp (' ':xs) = '\160' : spToNbsp xs
+spToNbsp (x:xs)   = x : spToNbsp xs
+spToNbsp []       = ""
 
 lineBlock :: RSTParser Blocks
 lineBlock = try $ do
   lines' <- many1 lineBlockLine
-  blanklines
+  skipMany1 $ blankline <|> try (char '|' >> blankline)
   return $ B.para (mconcat $ intersperse B.linebreak lines')
 
 --

tests/Tests/Readers/RST.hs

@@ -18,8 +18,8 @@ infix 4 =:
 
 tests :: [Test]
 tests = [ "line block with blank line" =:
-          "| a\n|\n|  b" =?> para (str "a" <> linebreak <>
-                                   linebreak <> str " " <> str "b")
+          "| a\n|\n|  b" =?> para (str "a") <>
+                             para (str "\160b")
         , "field list" =:
           [_LIT|
 :Hostname: media08

tests/rst-reader.native

@@ -232,8 +232,8 @@ Pandoc (Meta {docTitle = [Str "Pandoc",Space,Str "Test",Space,Str "Suite",Str ":
 ,Para [Str "Another",Space,Str "paragraph"]
 ,Para [Str "A",Space,Str "third",Space,Str "paragraph"]
 ,Header 1 ("",[],[]) [Str "Line",Space,Str "blocks"]
-,Para [Str "But",Space,Str "can",Space,Str "a",Space,Str "bee",Space,Str "be",Space,Str "said",Space,Str "to",Space,Str "be",LineBreak,Str "    or",Space,Str "not",Space,Str "to",Space,Str "be",Space,Str "an",Space,Str "entire",Space,Str "bee,",LineBreak,Str "        when",Space,Str "half",Space,Str "the",Space,Str "bee",Space,Str "is",Space,Str "not",Space,Str "a",Space,Str "bee,",LineBreak,Str "            due",Space,Str "to",Space,Str "some",Space,Str "ancient",Space,Str "injury?"]
-,Para [Str "Continuation",Space,Str "line",LineBreak,Str "  and",Space,Str "another"]
+,Para [Str "But",Space,Str "can",Space,Str "a",Space,Str "bee",Space,Str "be",Space,Str "said",Space,Str "to",Space,Str "be",LineBreak,Str "\160\160\160\160or",Space,Str "not",Space,Str "to",Space,Str "be",Space,Str "an",Space,Str "entire",Space,Str "bee,",LineBreak,Str "\160\160\160\160\160\160\160\160when",Space,Str "half",Space,Str "the",Space,Str "bee",Space,Str "is",Space,Str "not",Space,Str "a",Space,Str "bee,",LineBreak,Str "\160\160\160\160\160\160\160\160\160\160\160\160due",Space,Str "to",Space,Str "some",Space,Str "ancient",Space,Str "injury?"]
+,Para [Str "Continuation",Space,Str "line",LineBreak,Str "\160\160and",Space,Str "another"]
 ,Header 1 ("",[],[]) [Str "Simple",Space,Str "Tables"]
 ,Table [] [AlignDefault,AlignDefault,AlignDefault] [0.0,0.0,0.0]
  [[Plain [Str "col",Space,Str "1"]]

tests/rst-reader.rst

@@ -454,7 +454,7 @@ Line blocks
 |     or not to be an entire bee,
 |         when half the bee is not a bee,
 |             due to some ancient injury?
-
+|
 | Continuation
  line
 |   and