Implement TimeSync plugin (#2459)

plugins/timesync.koplugin/main.lua

@@ -0,0 +1,58 @@
+
+local Device = require("device")
+
+if not (Device:isKobo() or Device:isKindle() or Device:isPocketbook()) then
+    return { disabled = true, }
+end
+
+local InfoMessage = require("ui/widget/infomessage")
+local UIManager = require("ui/uimanager")
+local WidgetContainer = require("ui/widget/container/widgetcontainer")
+local T = require("ffi/util").template
+local _ = require("gettext")
+
+local TimeSync = WidgetContainer:new{
+    name = "timesync",
+}
+
+local function currentTime()
+    local std_out = io.popen("date")
+    if std_out then
+        local result = std_out:read("*all")
+        std_out:close()
+        return T(_("New Time is %1"), result)
+    else
+        return _("Time synchronized")
+    end
+end
+
+local function execute()
+    local txt
+    if os.execute("date -u +\"YYYY-MM-DD hh:mm:ss\" \"" ..
+                  "`wget -q -O - \"http://www.timeapi.org/utc/now\" | " ..
+                  "sed 's/T/ /g' | sed 's/+00:00//g'`\"") ~= 0 then
+        txt = _("Failed to retrieve time")
+    else
+        txt = currentTime()
+    end
+    UIManager:show(InfoMessage:new{
+        text = txt,
+        timeout = 3,
+    })
+    os.execute("hwclock -u -w")
+end
+
+local menuItem = {
+    text = _("Synchronize time"),
+    callback = execute,
+}
+
+function TimeSync:init()
+    self.ui.menu:registerToMainMenu(self)
+end
+
+function TimeSync:addToMainMenu(tab_item_table)
+    table.insert(tab_item_table.plugins, menuItem)
+end
+
+return TimeSync