Factor out common code for UList and OList parsing into a separate

function. Refactored UList function; wrote OList function.

src/MdToHTML.hs

@@ -287,13 +287,8 @@ parseBlockquote = do
   return (Blockquote parsedQuotedLines)
 
 -- Parse a nested list item.
-parseUListNested :: ReadP MdToken
+parseListNested :: ReadP MdToken
-parseUListNested = do
+parseListNested = do
-  --  firstChar <- string "    " <++ string "\t"
-  --  skipSpaces
-  --  restOfLine <- manyTill get (void (char '\n') <++ eof)
-  --  let restOfLineParsed = fst $ leftmostLongestParse parseLine restOfLine
-  --  return restOfLineParsed
   let firstCharParser = string "    " <++ string "\t"
   let restOfLineParser = manyTill get (void (char '\n') <++ eof)
   lines <- greedyParse1 (firstCharParser *> restOfLineParser)
@@ -308,7 +303,7 @@ parseUListLineItem = do
   skipSpaces
   restOfLine <- many1 parseListLineToken
   void (char '\n') <++ eof
-  nestedList <- parseUListNested <++ return (Unit "")
+  nestedList <- parseListNested <++ return (Unit "")
   return $ Line [Line restOfLine, nestedList]
 
 -- restOfLine <- manyTill get (void (char '\n') <++ eof)
@@ -322,11 +317,27 @@ parseUListLineItem = do
 parseUListParaItem :: ReadP MdToken
 parseUListParaItem = do
   firstLine <- parseUListLineItem
+  res <- parseListParaItemCommon
+  return $ Document (Para firstLine : res) -- I only wrap this in a document because I want some way of converting [MdToken] to MdToken, without any overhead. There is no other reason to wrap it in a Document.
+
+-- Parse an unordered list paragraph item.
+parseOListParaItem :: ReadP MdToken
+parseOListParaItem = do
+  firstLine <- parseOListLineItem
+  res <- parseListParaItemCommon
+  return $ Document (Para firstLine : res) -- I only wrap this in a document because I want some way of converting [MdToken] to MdToken, without any overhead. There is no other reason to wrap it in a Document.
+
+-- Common code for parsing list paragraph items.
+-- A list paragraph item is defined as a line item, followed by an empty line, followed by one or more
+-- lines indented by a space or tab.
+-- A list paragraph item can also be a blockquote.
+parseListParaItemCommon :: ReadP [MdToken]
+parseListParaItemCommon = do
   char '\n'
   lines <- greedyParse1 ((string "    " <|> string "\t") *> parseTillEol)
   let res = fst $ leftmostLongestParse (greedyParse1 parsePara) (init $ unlines lines)
   char '\n'
-  return $ Document (Para firstLine : res) -- I only wrap this in a document because I want some way of converting [MdToken] to MdToken, without any overhead. There is no other reason to wrap it in a Document.
+  return res -- I only wrap this in a document because I want some way of converting [MdToken] to MdToken, without any overhead. There is no other reason to wrap it in a Document.
 
 -- Parse an unordered list item, which can be a line item or another list.
 parseUListItem :: ReadP MdToken