Don't look for frontmatter on binary files. Fixes #728

middleman-core/lib/middleman-core/core_extensions/front_matter.rb

@@ -130,8 +130,11 @@ module Middleman::CoreExtensions
       # @return [Array<Thor::CoreExt::HashWithIndifferentAccess, String>]
       def frontmatter_and_content(path)
         full_path = File.expand_path(File.join(@app.source_dir, path))
-        content = File.read(full_path)
         data = {}
+        content = nil
+
+        if !::Middleman::Util.binary?(full_path)
+          content = File.read(full_path)
           
           begin
             if content =~ /\A.*coding:/
@@ -148,6 +151,7 @@ module Middleman::CoreExtensions
           rescue => e
             # Probably a binary file, move on
           end
+        end
 
         [data, content]
       end

middleman-core/lib/middleman-core/sitemap/resource.rb

@@ -151,8 +151,7 @@ module Middleman
       #
       # @retrun [Boolean]
       def binary?
-        s = (File.read(source_file, File.stat(source_file).blksize) || "").split(//)
+        ::Middleman::Util.binary?(source_file)
-        ((s.size - s.grep(" ".."~").size) / s.size.to_f) > 0.30
       end
     end
   end

middleman-core/lib/middleman-core/util.rb

@@ -10,10 +10,21 @@ require "thor"
 # Core Pathname library used for traversal
 require "pathname"
 
+require 'win32/file' if File::ALT_SEPARATOR
+
 module Middleman
 
   module Util
 
+    # Whether the source file is binary.
+    #
+    # @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
+    end
+
     # The logger
     #
     # @return [Middleman::Logger] The logger