add get_system_info function

community/battery-widget.lua

@@ -1,9 +1,10 @@
 -- name = "Battery info"
 
-ticks = 0
+ticks = -1
 
 function on_tick()
   -- Update one time per 10 seconds
+  ticks = ticks + 1
   if ticks % 10 ~= 0 then
     return
   end
@@ -19,12 +20,12 @@ function stringify_table(tab)
   local new_tab = {}
 
   for k,v in pairs(tab) do
-    table.insert(new_tab, k:capitalize()..": "..tostring(v))
+    table.insert(new_tab, capitalize(k)..": "..tostring(v))
   end
 
   return new_tab
 end
 
-function string:capitalize()
-  return (self:gsub("^%l", string.upper))
+function capitalize(string)
+  return string:gsub("^%l", string.upper)
 end