Backup and restore bookmarks/highlights when switching engines (#8455)

Bookmark/highlight formats in crengine and mupdf are incompatible.
This backups and restores bookmarks and highlights when opening the
document with an incompatible engine, instead of deleting them.

frontend/apps/reader/modules/readerbookmark.lua

@@ -264,7 +264,22 @@ function ReaderBookmark:importSavedHighlight(config)
 end
 
 function ReaderBookmark:onReadSettings(config)
-    self.bookmarks = config:readSetting("bookmarks") or {}
+    self.bookmarks = config:readSetting("bookmarks", {})
+    -- Bookmark formats in crengine and mupdf are incompatible.
+    -- Backup bookmarks when the document is opened with incompatible engine.
+    if #self.bookmarks > 0 then
+        if self.ui.rolling and type(self.bookmarks[1].page) == "number" then
+            config:saveSetting("bookmarks_paging", self.bookmarks)
+            self.bookmarks = config:readSetting("bookmarks_rolling", {})
+            config:saveSetting("bookmarks", self.bookmarks)
+            config:delSetting("bookmarks_rolling")
+        elseif self.ui.paging and type(self.bookmarks[1].page) == "string" then
+            config:saveSetting("bookmarks_rolling", self.bookmarks)
+            self.bookmarks = config:readSetting("bookmarks_paging", {})
+            config:saveSetting("bookmarks", self.bookmarks)
+            config:delSetting("bookmarks_paging")
+        end
+    end
     -- need to do this after initialization because checking xpointer
     -- may cause segfaults before credocuments are inited.
     self.ui:registerPostInitCallback(function()

frontend/apps/reader/modules/readerview.lua

@@ -789,7 +789,22 @@ function ReaderView:onReadSettings(config)
     self:resetLayout()
     local page_scroll = config:readSetting("kopt_page_scroll") or self.document.configurable.page_scroll
     self.page_scroll = page_scroll == 1 and true or false
-    self.highlight.saved = config:readSetting("highlight") or {}
+    self.highlight.saved = config:readSetting("highlight", {})
+    -- Highlight formats in crengine and mupdf are incompatible.
+    -- Backup highlights when the document is opened with incompatible engine.
+    if #self.highlight.saved > 0 then
+        if self.ui.rolling and type(self.highlight.saved[1][1].pos0) == "table" then
+            config:saveSetting("highlight_paging", self.highlight.saved)
+            self.highlight.saved = config:readSetting("highlight_rolling", {})
+            config:saveSetting("highlight", self.highlight.saved)
+            config:delSetting("highlight_rolling")
+        elseif self.ui.paging and type(self.highlight.saved[1][1].pos0) == "string" then
+            config:saveSetting("highlight_rolling", self.highlight.saved)
+            self.highlight.saved = config:readSetting("highlight_paging", {})
+            config:saveSetting("highlight", self.highlight.saved)
+            config:delSetting("highlight_paging")
+        end
+    end
     self.inverse_reading_order = config:isTrue("inverse_reading_order") or G_reader_settings:isTrue("inverse_reading_order")
     self.page_overlap_enable = config:isTrue("show_overlap_enable") or G_reader_settings:isTrue("page_overlap_enable") or DSHOWOVERLAP
     self.page_overlap_style = config:readSetting("page_overlap_style") or G_reader_settings:readSetting("page_overlap_style") or "dim"

frontend/apps/reader/readerui.lua

@@ -549,30 +549,9 @@ function ReaderUI:showReader(file, provider)
 
     -- We can now signal the existing ReaderUI/FileManager instances that it's time to go bye-bye...
     UIManager:broadcastEvent(Event:new("ShowingReader"))
-
-    -- prevent crash due to incompatible bookmarks
-    --- @todo Split bookmarks from metadata and do per-engine in conversion.
     provider = provider or DocumentRegistry:getProvider(file)
     if provider.provider then
-        local doc_settings = DocSettings:open(file)
-        local bookmarks = doc_settings:readSetting("bookmarks") or {}
-        if #bookmarks >= 1 and
-           ((provider.provider == "crengine" and type(bookmarks[1].page) == "number") or
-            (provider.provider == "mupdf" and type(bookmarks[1].page) == "string")) then
-                UIManager:show(ConfirmBox:new{
-                    text = T(_("The document '%1' with bookmarks or highlights was previously opened with a different engine. To prevent issues, bookmarks need to be deleted before continuing."),
-                        BD.filepath(file)),
-                    ok_text = _("Delete"),
-                    ok_callback = function()
-                        doc_settings:delSetting("bookmarks")
-                        doc_settings:close()
-                        self:showReaderCoroutine(file, provider)
-                    end,
-                    cancel_callback = function() self:showFileManager() end,
-                })
-        else
-            self:showReaderCoroutine(file, provider)
-        end
+        self:showReaderCoroutine(file, provider)
     end
 end