AsciiDoc: Don't use Roman numerals in ordered lists.

AsiiDoc doesn't support them.

src/Text/Pandoc/Writers/AsciiDoc.hs

@@ -213,8 +213,12 @@ blockToAsciiDoc opts (Table caption aligns widths headers rows) =  do
 blockToAsciiDoc opts (BulletList items) = do
   contents <- mapM (bulletListItemToAsciiDoc opts) items
   return $ cat contents <> blankline
-blockToAsciiDoc opts (OrderedList (start, sty, _delim) items) = do
-  let markers  = orderedListMarkers (start, sty, Period)
+blockToAsciiDoc opts (OrderedList (_start, sty, _delim) items) = do
+  let sty' = case sty of
+                  UpperRoman -> UpperAlpha
+                  LowerRoman -> LowerAlpha
+                  x          -> x
+  let markers  = orderedListMarkers (1, sty', Period)  -- start num not used
   let markers' = map (\m -> if length m < 3
                                then m ++ replicate (3 - length m) ' '
                                else m) markers

tests/writer.asciidoc

@@ -238,21 +238,21 @@ Tabs and spaces
 Fancy list markers
 ~~~~~~~~~~~~~~~~~~
 
-2.  begins with 2
-3.  and now 3
+1.  begins with 2
+2.  and now 3
 +
 with a continuation
-iv. sublist with roman numerals, starting with 4
-v.  more items
+a.  sublist with roman numerals, starting with 4
+b.  more items
 A.  a subsublist
 B.  a subsublist
 
 Nesting:
 
 A.  Upper Alpha
-I.  Upper Roman.
-6.  Decimal start with 6
-c.  Lower alpha with paren
+A.  Upper Roman.
+1.  Decimal start with 6
+a.  Lower alpha with paren
 
 Autonumbering: