From da3948476772b3697eb44beed8cf70776e913912 Mon Sep 17 00:00:00 2001
From: Ben Hollis <ben@benhollis.net>
Date: Tue, 22 Jan 2013 00:59:54 -0800
Subject: [PATCH] Mitigate major perf regression caused by the
 Middleman::Util#binary? method

---
 middleman-core/lib/middleman-core/util.rb | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/middleman-core/lib/middleman-core/util.rb b/middleman-core/lib/middleman-core/util.rb
index 950f7a80..46854994 100644
--- a/middleman-core/lib/middleman-core/util.rb
+++ b/middleman-core/lib/middleman-core/util.rb
@@ -10,8 +10,6 @@ require "thor"
 # Core Pathname library used for traversal
 require "pathname"
 
-require 'win32/file' if File::ALT_SEPARATOR
-
 module Middleman
 
   module Util
@@ -21,8 +19,17 @@ module Middleman
     # @param [String] filename The file to check.
     # @return [Boolean]
     def self.binary?(filename)
-      s = (File.read(filename, File.stat(filename).blksize) || "").split(//)
-      ((s.size - s.grep(" ".."~").size) / s.size.to_f) > 0.30
+      ext = File.extname(filename)
+      return false if Tilt.registered?(ext.sub('.',''))
+
+      ext = ".#{ext}" unless ext.to_s[0] == ?.
+      mime = ::Rack::Mime.mime_type(ext, nil) 
+      return false unless mime
+      return false if mime.start_with?('text/')
+      return false if mime.include?('xml')
+      return false if mime.include?('json')
+      return false if mime.include?('javascript')
+      true
     end
 
     # The logger