Added new rule for enhanced markdown ordered lists: if the list marker

is a capital letter followed by a period (including a single-letter
capital roman numeral), then it must be followed by at least two spaces.
The point of this is to avoid accidentally treating people's initials as
list markers: a paragraph may begin:

    B. Russell was an English philosopher.

and this shouldn't be treated as a list.

Modified Markdown reader and README documentation.
Added a test case.


git-svn-id: https://pandoc.googlecode.com/svn/trunk@880 788f1e2b-df1e-0410-8736-df70ead52e1b

1 files changed, 9 insertions, 6 deletions

diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs
index 82a82925d..b4302e6e4 100644
--- a/src/Text/Pandoc/Readers/Markdown.hs
+++ b/src/Text/Pandoc/Readers/Markdown.hs
@@ -327,12 +327,15 @@ orderedListStart style delim = try $ do
   optional newline -- if preceded by a Plain block in a list context
   nonindentSpaces
   state <- getState
-  if stateStrict state
-     then do many1 digit
-             char '.'
-             return 1
-     else orderedListMarker style delim 
-  spaceChar
+  num <- if stateStrict state
+            then do many1 digit
+                    char '.'
+                    return 1
+            else orderedListMarker style delim 
+  if delim == Period && (style == UpperAlpha || (style == UpperRoman &&
+     num `elem` [1, 5, 10, 50, 100, 500, 1000]))
+     then char '\t' <|> (spaceChar >> spaceChar)
+     else spaceChar
   skipSpaces
 
 -- parse a line of a list item (start = parser for beginning of list item)