Update statistics plugin to support docless mode

plugins/statistics.koplugin/main.lua

@@ -21,7 +21,6 @@ local statistics_dir = DataStorage:getDataDir() .. "/statistics/"
 local page_max_time
 
 local ReaderStatistics = Widget:extend{
-    is_doc_only = true,
     last_time = nil,
     page_min_read_sec = 5,
     page_max_read_sec = 90,
@@ -41,8 +40,12 @@ local ReaderStatistics = Widget:extend{
     },
 }
 
+function ReaderStatistics:isDocless()
+    return self.ui == nil or self.ui.document == nil
+end
+
 function ReaderStatistics:init()
-    if self.ui.document.is_pic then
+    if not self:isDocless() and self.ui.document.is_pic then
         return
     end
 
@@ -69,8 +72,10 @@ function ReaderStatistics:getBookProperties()
 end
 
 function ReaderStatistics:initData(config)
+    if self:isDocless() or not self.is_enabled then
+        return
+    end
     -- first execution
-    if self.is_enabled then
     if not self.data then
         self.data = { performance_in_pages= {} }
         self:inplaceMigration();  -- first time merge data
@@ -85,7 +90,6 @@ function ReaderStatistics:initData(config)
     self.data.pages = self.view.document:getPageCount()
     return
 end
-end
 
 local function generateReadBooksTable(title, dates)
     local result = {}
@@ -104,13 +108,13 @@ function ReaderStatistics:getStatisticEnabledMenuItem()
         checked_func = function() return self.is_enabled end,
         callback = function()
             -- if was enabled, have to save data to file
-            if self.last_time and self.is_enabled then
+            if self.last_time and self.is_enabled and not self:isDocless() then
                 self.ui.doc_settings:saveSetting("stats", self.data)
             end
 
             self.is_enabled = not self.is_enabled
             -- if was disabled have to get data from file
-            if self.is_enabled then
+            if self.is_enabled and not self:isDocless() then
                 self:initData(self.ui.doc_settings)
             end
             self:saveSettings()
@@ -178,7 +182,8 @@ function ReaderStatistics:addToMainMenu(tab_item_table)
                         title = _("Statistics"),
                         kv_pairs = self:getCurrentStat(),
                     })
-                end
+                end,
+                enabled = not self:isDocless()
             },
             {
                 text = _("All books"),
@@ -445,7 +450,9 @@ local function getDatesForBook(book)
 end
 
 function ReaderStatistics:getTotalStats()
-    local total_stats = {
+    local total_stats = {}
+    if not self:isDocless() then
+        total_stats = {
             {
                 self.data.title,
                 util.secondsToClock(self.data.total_time_in_sec, false),
@@ -457,6 +464,7 @@ function ReaderStatistics:getTotalStats()
                 end,
             }
         }
+    end
     -- find stats for all other books in history
     local proceded_titles, total_books_time = self:getStatisticsFromHistory(total_stats)
     total_books_time = total_books_time + self:getOldStatisticsFromDirectory(proceded_titles, total_stats)
@@ -522,7 +530,9 @@ function ReaderStatistics:getOldStatisticsFromDirectory(exlude_titles, total_sta
 end
 
 function ReaderStatistics:onPageUpdate(pageno)
-    if self.is_enabled then
+    if self:isDocless() or not self.is_enabled then
+        return
+    end
     local curr_time = TimeVal:now()
     local diff_time = curr_time.sec - self.last_time.sec
 
@@ -546,7 +556,6 @@ function ReaderStatistics:onPageUpdate(pageno)
 
     self.last_time = curr_time
 end
-end
 
 -- For backward compatibility
 function ReaderStatistics:inplaceMigration()
@@ -576,7 +585,7 @@ function ReaderStatistics:importFromFile(base_path, item)
 end
 
 function ReaderStatistics:onCloseDocument()
-    if self.last_time and self.is_enabled then
+    if not self:isDocless() and self.last_time and self.is_enabled then
         self.ui.doc_settings:saveSetting("stats", self.data)
     end
 end
@@ -592,10 +601,11 @@ end
 -- in case when screensaver starts
 function ReaderStatistics:onSaveSettings()
     self:saveSettings()
+    if not self:isDocless() then
         self.ui.doc_settings:saveSetting("stats", self.data)
         self.current_period = 0
         self.pages_current_period = 0
-
+    end
 end
 
 -- screensaver off