From 6819f75070896a0d9be3ea0d29b2984ab04a0e76 Mon Sep 17 00:00:00 2001
From: Marcin Kulik <marcin.kulik@gmail.com>
Date: Sun, 12 Feb 2012 21:53:00 +0100
Subject: [PATCH] Simplify dirty line tracking

---
 app/assets/javascripts/player/vt.js.coffee | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/app/assets/javascripts/player/vt.js.coffee b/app/assets/javascripts/player/vt.js.coffee
index de0b562..7a89d26 100644
--- a/app/assets/javascripts/player/vt.js.coffee
+++ b/app/assets/javascripts/player/vt.js.coffee
@@ -349,12 +349,11 @@ class AsciiIo.VT
     @lineData = @alternateBuffer
     @updateScreen()
 
-  updateLine: (n) ->
-    n = (if typeof n isnt "undefined" then n else @cursorY)
-    @dirtyLines[n] = n
+  updateLine: (n = @cursorY) ->
+    @dirtyLines[n] = @lineData[n]
 
   updateScreen: ->
-    @dirtyLines[n] = n for n in [0...@lines]
+    @dirtyLines[n] = @lineData[n] for n in [0...@lines]
 
   carriageReturn: ->
     @goToFirstColumn()
@@ -392,11 +391,7 @@ class AsciiIo.VT
     @cursorY >= @topMargin and @cursorY <= @bottomMargin
 
   changes: ->
-    c = {}
-    for _, n of @dirtyLines
-      c[n] = @lineData[n]
-
-    c
+    @dirtyLines
 
   clearChanges: ->
     @dirtyLines = {}