Fixed problems in RST and markdown output due to bug in pretty-1.0.1.0

+ Added hang' function to Text.Pandoc.Shared; this will be used instead
  of hang, which doesn't work properly in pretty-1.0.1.0.  When pretty
  is upgraded, we can go back to hang.
  See  http://article.gmane.org/gmane.comp.lang.haskell.general/16687
+ Use hang' (and some different techniques) in RST and markdown writers.
  Some output is now a bit different.
+ Modify test suites accordingly.


git-svn-id: https://pandoc.googlecode.com/svn/trunk@1515 788f1e2b-df1e-0410-8736-df70ead52e1b

3 files changed, 16 insertions, 11 deletions

diff --git a/Text/Pandoc/Shared.hs b/Text/Pandoc/Shared.hs
index f8c5e8d17..c607a4e5b 100644
--- a/Text/Pandoc/Shared.hs
+++ b/Text/Pandoc/Shared.hs
@@ -87,7 +87,8 @@ module Text.Pandoc.Shared (
                      KeyTable,
                      lookupKeySrc,
                      refsMatch,
-                     -- * Native format prettyprinting
+                     -- * Prettyprinting
+                     hang',
                      prettyPandoc,
                      -- * Pandoc block and inline list processing
                      orderedListMarkers,
@@ -106,7 +107,7 @@ module Text.Pandoc.Shared (
 
 import Text.Pandoc.Definition
 import Text.ParserCombinators.Parsec
-import Text.PrettyPrint.HughesPJ ( Doc, fsep, ($$), (<>), empty, isEmpty, text )
+import Text.PrettyPrint.HughesPJ ( Doc, fsep, ($$), (<>), empty, isEmpty, text, nest )
 import qualified Text.PrettyPrint.HughesPJ as PP
 import Text.Pandoc.CharacterReferences ( characterReference )
 import Data.Char ( toLower, toUpper, ord, isLower, isUpper )
@@ -729,9 +730,13 @@ refsMatch [] x = null x
 refsMatch x [] = null x
 
 --
--- Native format prettyprinting
+-- Prettyprinting
 --
- 
+
+-- | A version of hang that works like the version in pretty-1.0.0.0
+hang' :: Doc -> Int -> Doc -> Doc
+hang' d1 n d2 = d1 $$ (nest n d2)
+
 -- | Indent string as a block.
 indentBy :: Int    -- ^ Number of spaces to indent the block 
          -> Int    -- ^ Number of spaces (rel to block) to indent first line
diff --git a/Text/Pandoc/Writers/Markdown.hs b/Text/Pandoc/Writers/Markdown.hs
index 787700603..8f703a7d5 100644
--- a/Text/Pandoc/Writers/Markdown.hs
+++ b/Text/Pandoc/Writers/Markdown.hs
@@ -95,7 +95,7 @@ noteToMarkdown :: WriterOptions -> Int -> [Block] -> State WriterState Doc
 noteToMarkdown opts num blocks = do
   contents  <- blockListToMarkdown opts blocks
   let marker = text "[^" <> text (show num) <> text "]:"
-  return $ hang marker (writerTabStop opts) contents 
+  return $ hang' marker (writerTabStop opts) contents 
 
 -- | Escape special characters for Markdown.
 escapeString :: String -> String
@@ -257,7 +257,7 @@ blockToMarkdown opts (DefinitionList items) = do
 bulletListItemToMarkdown :: WriterOptions -> [Block] -> State WriterState Doc
 bulletListItemToMarkdown opts items = do
   contents <- blockListToMarkdown opts items
-  return $ hang (text "-  ") (writerTabStop opts) contents
+  return $ hang' (text "-  ") (writerTabStop opts) contents
 
 -- | Convert ordered list item (a list of blocks) to markdown.
 orderedListItemToMarkdown :: WriterOptions -- ^ options
diff --git a/Text/Pandoc/Writers/RST.hs b/Text/Pandoc/Writers/RST.hs
index 460a11852..91826cbcd 100644
--- a/Text/Pandoc/Writers/RST.hs
+++ b/Text/Pandoc/Writers/RST.hs
@@ -100,8 +100,8 @@ notesToRST notes =
 noteToRST :: Int -> [Block] -> State WriterState Doc
 noteToRST num note = do
   contents <- blockListToRST note
-  let marker = text ".. [" <> text (show num) <> text "] "
-  return $ hang marker 3 contents 
+  let marker = text ".. [" <> text (show num) <> text "]"
+  return $ marker $$ nest 3 contents
 
 -- | Return RST representation of picture reference table.
 pictTableToRST :: KeyTable -> State WriterState Doc
@@ -169,7 +169,7 @@ blockToRST (Para inlines) = do
   return $ contents <> text "\n"
 blockToRST (RawHtml str) = 
   let str' = if "\n" `isSuffixOf` str then str ++ "\n" else str ++ "\n\n" in
-  return $ hang (text "\n.. raw:: html\n") 3 $ vcat $ map text (lines str')
+  return $ (text "\n.. raw:: html\n") $$ (nest 3 $ vcat $ map text (lines str'))
 blockToRST HorizontalRule = return $ text "--------------\n"
 blockToRST (Header level inlines) = do
   contents <- inlineListToRST inlines
@@ -236,7 +236,7 @@ blockToRST (DefinitionList items) = do
 bulletListItemToRST :: [Block] -> State WriterState Doc
 bulletListItemToRST items = do
   contents <- blockListToRST items
-  return $ hang (text "- ") 3 contents
+  return $ (text "-  ") <> contents
 
 -- | Convert ordered list item (a list of blocks) to RST.
 orderedListItemToRST :: String   -- ^ marker for list item
@@ -244,7 +244,7 @@ orderedListItemToRST :: String   -- ^ marker for list item
                      -> State WriterState Doc
 orderedListItemToRST marker items = do
   contents <- blockListToRST items
-  return $ hang (text marker) (length marker + 1) contents 
+  return $ (text marker <> char ' ') <> contents 
 
 -- | Convert defintion list item (label, list of blocks) to RST.
 definitionListItemToRST :: ([Inline], [Block]) -> State WriterState Doc