From ee6337034aae1c5b1330e553227b7d8e39410fc5 Mon Sep 17 00:00:00 2001
From: abe33 <cedric.nehemie@gmail.com>
Date: Mon, 27 Jul 2015 10:09:31 +0200
Subject: [PATCH] :bug: Fix error raised if some invisibles are undefined

Fixes #368
---
 lib/mixins/canvas-drawer.coffee | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/lib/mixins/canvas-drawer.coffee b/lib/mixins/canvas-drawer.coffee
index 71cedffd..bc65db4a 100644
--- a/lib/mixins/canvas-drawer.coffee
+++ b/lib/mixins/canvas-drawer.coffee
@@ -210,12 +210,13 @@ class CanvasDrawer extends Mixin
   # line - The screen line for which replacing the invisibles characters.
   getInvisibleRegExp: (line) ->
     if line? and line.invisibles?
-      ///
-      #{_.escapeRegExp line.invisibles.cr}|
-      #{_.escapeRegExp line.invisibles.eol}|
-      #{_.escapeRegExp line.invisibles.space}|
-      #{_.escapeRegExp line.invisibles.tab}
-      ///g
+      invisibles = []
+      invisibles.push line.invisibles.cr if line.invisibles.cr?
+      invisibles.push line.invisibles.eol if line.invisibles.eol?
+      invisibles.push line.invisibles.space if line.invisibles.space?
+      invisibles.push line.invisibles.tab if line.invisibles.tab?
+
+      ///#{invisibles.map(_.escapeRegExp).join('|')}///g
 
   # Internal: Draws a single token on the given context.
   #