From 0c1f7a5e88bca05bd868eaf3da28d922d455637e Mon Sep 17 00:00:00 2001
From: Tanner Rogalsky <the.t.dawg@gmail.com>
Date: Tue, 11 Jun 2013 12:41:46 -0400
Subject: [PATCH] Add doFor function that runs the callback on every update
 until the timer expires.

---
 cron.lua | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/cron.lua b/cron.lua
index 25b8013..3cbac8a 100644
--- a/cron.lua
+++ b/cron.lua
@@ -60,6 +60,15 @@ local function updatePeriodicEntry(self, dt)
   end
 end
 
+local function updateLimitedEntry(self, dt)
+  self.running = self.running + dt
+
+  self.callback(unpack(self.args))
+  if self.running >= self.time then
+    cron.cancel(self)
+  end
+end
+
 local function addTags(...)
   local tags = {...}
   local len  = #tags
@@ -151,6 +160,11 @@ function cron.every(time, callback, ...)
   return newEntry(time, callback, updatePeriodicEntry, ...)
 end
 
+function cron.doFor(time, callback, ...)
+  checkTimeAndCallback(time, callback)
+  return newEntry(time, callback, updateLimitedEntry, ...)
+end
+
 function cron.update(dt)
   assert(type(dt) == "number" and dt >= 0, "dt must be a non-negative number")
 
@@ -174,4 +188,3 @@ end
 cron.reset()
 
 return cron
-