PowerPoint writer: Always open up in slide view

When editing a template/reference-doc, the user might be in Master
view, but when producing a slide show, it is assumed that slide view
will be desired. This removes the "lastView" attr from the
viewProps.xml slide so that the presentation will always open up in
slide view.

Note this requires creating a new "ppt/viewProps.xml" instead of just
moving over the old one from the viewProps file. Since this produces a
slightly different order of xml files in the content manifest, the
golden files will have to be rebuilt.

src/Text/Pandoc/Writers/Powerpoint/Output.hs

@@ -166,7 +166,6 @@ alwaysInheritedPatterns =
               , "ppt/theme/theme1.xml"
               , "ppt/theme/_rels/theme1.xml.rels"
               , "ppt/presProps.xml"
-              , "ppt/viewProps.xml"
               , "ppt/tableStyles.xml"
               , "ppt/media/image*"
               ]
@@ -213,7 +212,6 @@ requiredFiles = [ "docProps/app.xml"
                 , "ppt/slideMasters/slideMaster1.xml"
                 , "ppt/slideMasters/_rels/slideMaster1.xml.rels"
                 , "ppt/theme/theme1.xml"
-                , "ppt/viewProps.xml"
                 , "ppt/tableStyles.xml"
                 ]
 
@@ -231,6 +229,8 @@ presentationToArchiveP p@(Presentation docProps slides) = do
     )
 
   newArch' <- foldM copyFileToArchive emptyArchive filePaths
+  -- we make a modified ppt/viewProps.xml out of the presentation viewProps
+  viewPropsEntry <- makeViewPropsEntry
   -- we make a docProps/core.xml entry out of the presentation docprops
   docPropsEntry <- docPropsToEntry docProps
   -- we make a docProps/custom.xml entry out of the custom properties
@@ -258,7 +258,7 @@ presentationToArchiveP p@(Presentation docProps slides) = do
     spkNotesRelEntries ++
     mediaEntries ++
     [contentTypesEntry, docPropsEntry, docCustomPropsEntry, relsEntry,
-     presEntry, presRelsEntry]
+     presEntry, presRelsEntry, viewPropsEntry]
 
 makeSlideIdMap :: Presentation -> M.Map SlideId Int
 makeSlideIdMap (Presentation _ slides) =
@@ -1701,6 +1701,23 @@ docCustomPropsToEntry :: PandocMonad m => DocProps -> P m Entry
 docCustomPropsToEntry docProps = docCustomPropsElement docProps >>=
                            elemToEntry "docProps/custom.xml"
 
+-- We read from the template, but we remove the lastView, so it always
+-- opens on slide view. Templates will sometimes be open in master
+-- view for editing.
+viewPropsElement :: PandocMonad m => P m Element
+viewPropsElement = do
+  refArchive <- asks envRefArchive
+  distArchive <- asks envDistArchive
+  viewPrElement <- parseXml refArchive distArchive "ppt/viewProps.xml"
+  -- remove  "lastView" if it exists:
+  let notLastView :: Text.XML.Light.Attr -> Bool
+      notLastView attr = (qName $ attrKey attr) /= "lastView"
+  return $
+    viewPrElement {elAttribs = filter notLastView (elAttribs viewPrElement)}
+
+makeViewPropsEntry :: PandocMonad m => P m Entry
+makeViewPropsEntry = viewPropsElement >>= elemToEntry "ppt/viewProps.xml"
+
 defaultContentTypeToElem :: DefaultContentType -> Element
 defaultContentTypeToElem dct =
   mknode "Default"
@@ -1787,9 +1804,11 @@ presentationToContentTypes p@(Presentation _ slides) = do
                       (mapMaybe mediaFileContentType $ mediaFps)
 
       inheritedOverrides = mapMaybe pathToOverride filePaths
-      docPropsOverride = mapMaybe pathToOverride ["docProps/core.xml"]
-      docCustomPropsOverride = mapMaybe pathToOverride ["docProps/custom.xml"]
-      presOverride = mapMaybe pathToOverride ["ppt/presentation.xml"]
+      createdOverrides = mapMaybe pathToOverride [ "docProps/core.xml"
+                                                 , "docProps/custom.xml"
+                                                 , "ppt/presentation.xml"
+                                                 , "ppt/viewProps.xml"
+                                                 ]
   relativePaths <- mapM slideToFilePath slides
   let slideOverrides = mapMaybe
                        (\fp -> pathToOverride $ "ppt/slides/" ++ fp)
@@ -1797,8 +1816,7 @@ presentationToContentTypes p@(Presentation _ slides) = do
   speakerNotesOverrides <- (mapMaybe pathToOverride) <$> getSpeakerNotesFilePaths
   return $ ContentTypes
     (defaults ++ mediaDefaults)
-    (inheritedOverrides ++ docPropsOverride ++ docCustomPropsOverride ++
-     presOverride ++ slideOverrides ++ speakerNotesOverrides)
+    (inheritedOverrides ++ createdOverrides ++ slideOverrides ++ speakerNotesOverrides)
 
 presML :: String
 presML = "application/vnd.openxmlformats-officedocument.presentationml"