Docx writer: Move one more env var to Reader monad

PrintWidth is set at the beginning and stays the same throughout the
document writing, so we just set it as an env variable in the Reader
monad.

src/Text/Pandoc/Writers/Docx.hs

@@ -100,7 +100,7 @@ data WriterEnv = WriterEnv{ envTextProperties :: [Element]
                           , envInDel :: Bool
                           , envChangesAuthor :: String
                           , envChangesDate :: String
-
+                          , envPrintWidth :: Integer
                           }
 
 defaultWriterEnv :: WriterEnv
@@ -112,6 +112,7 @@ defaultWriterEnv = WriterEnv{ envTextProperties = []
                             , envInDel = False
                             , envChangesAuthor  = "unknown"
                             , envChangesDate    = "1969-12-31T19:00:00Z"
+                            , envPrintWidth     = 1
                             }
 
 data WriterState = WriterState{
@@ -122,7 +123,6 @@ data WriterState = WriterState{
        , stLists          :: [ListMarker]
        , stInsId          :: Int
        , stDelId          :: Int
-       , stPrintWidth     :: Integer
        , stStyleMaps      :: StyleMaps
        , stFirstPara      :: Bool
        , stTocTitle       :: [Inline]
@@ -139,7 +139,6 @@ defaultWriterState = WriterState{
       , stLists          = [NoMarker]
       , stInsId          = 1
       , stDelId          = 1
-      , stPrintWidth     = 1
       , stStyleMaps      = defaultStyleMaps
       , stFirstPara      = False
       , stTocTitle       = normalizeInlines [Str "Table of Contents"]
@@ -259,8 +258,7 @@ writeDocx opts doc@(Pandoc meta _) = do
                     metaValueToInlines <$> lookupMeta "toc-title" meta
 
   let initialSt = defaultWriterState {
-          stPrintWidth = (maybe 420 (\x -> quot x 20) pgContentWidth)
-        , stStyleMaps  = styleMaps
+          stStyleMaps  = styleMaps
         , stTocTitle   = tocTitle
         }
 
@@ -273,6 +271,7 @@ writeDocx opts doc@(Pandoc meta _) = do
           envRTL = isRTLmeta
         , envChangesAuthor = fromMaybe "unknown" username
         , envChangesDate   = formatTime defaultTimeLocale "%FT%XZ" utctime
+        , envPrintWidth = (maybe 420 (\x -> quot x 20) pgContentWidth)
         }
 
 
@@ -1171,7 +1170,7 @@ inlineToOpenXML' opts (Link _ txt (src,_)) = do
   return [ mknode "w:hyperlink" [("r:id",id')] contents ]
 inlineToOpenXML' opts (Image attr alt (src, _)) = do
   -- first, check to see if we've already done this image
-  pageWidth <- gets stPrintWidth
+  pageWidth <- asks envPrintWidth
   imgs <- gets stImages
   case M.lookup src imgs of
     Just (_,_,_,elt,_) -> return [elt]