every is nearly working

cron.lua

@@ -22,6 +22,7 @@ local function newEntry(time, callback, update, ...)
     update = update
   }
   entries[entry] = entry
+  return entry
 end
 
 local function updateTimedEntry(self, dt)
@@ -32,6 +33,15 @@ local function updateTimedEntry(self, dt)
   end
 end
 
+local function updatePeriodicEntry(self, dt)
+  self.running = self.running + dt
+
+  if self.running >= self.time then
+    self.callback(unpack(self.args))
+    self.running=0
+  end
+end
+
 
 local cron = {}
 
@@ -41,13 +51,12 @@ end
 
 function cron.after(time, callback, ...)
   checkTimeAndCallback(time, callback)
-
   return newEntry(time, callback, updateTimedEntry, ...)
 end
 
 function cron.every(time, callback, ...)
   checkTimeAndCallback(time, callback)
-
+  return newEntry(time, callback, updatePeriodicEntry, ...)
 end
 
 function cron.update(dt)

spec/cron_spec.lua

@@ -68,6 +68,18 @@ context( 'cron', function()
       assert_error(function() cron.every(-2, count) end)
       assert_not_error(function() cron.every(2, count) end)
     end)
+
+    test( 'Should execute periodical actions periodically', function()
+      cron.every(2, count)
+      cron.update(1)
+      assert_equal(counter, 0)
+      cron.update(1)
+      assert_equal(counter, 1)
+      cron.update(2)
+      assert_equal(counter, 2)
+      cron.update(1)
+      assert_equal(counter, 2)
+    end)
   end)