merge more into core, use gem availability to autoload

middleman-core/lib/middleman-more/extensions/gzip.rb

@@ -0,0 +1,70 @@
+# This extension Gzips assets and pages when building.
+# Gzipped assets and pages can be served directly by Apache or
+# Nginx with the proper configuration, and pre-zipping means that we
+# can use a more agressive compression level at no CPU cost per request.
+#
+# Use Nginx's gzip_static directive, or AddEncoding and mod_rewrite in Apache
+# to serve your Gzipped files whenever the normal (non-.gz) filename is requested.
+#
+# Pass the :exts options to customize which file extensions get zipped (defaults
+# to .html, .htm, .js and .css.
+#
+class Middleman::Extensions::Gzip < ::Middleman::Extension
+  option :exts, %w(.js .css .html .htm), 'File extensions to Gzip when building.'
+
+  def initialize(app, options_hash={})
+    super
+    
+    require 'zlib'
+    require 'stringio'
+    require 'find'
+
+    gzip_ext = self
+
+    app.after_build do |builder|
+      paths = ::Middleman::Util.all_files_under(self.class.inst.build_dir)
+      paths.each do |path|
+        next unless gzip_ext.options.exts.include? path.extname
+
+        output_filename, old_size, new_size = gzip_ext.gzip_file(path.to_s)
+
+        if output_filename
+          size_change_word = (old_size - new_size) > 0 ? 'smaller' : 'larger'
+          old_locale = I18n.locale
+          I18n.locale = :en # use the english localizations for printing out file sizes to make sure the localizations exist
+          builder.say_status :gzip, "#{output_filename} (#{number_to_human_size((old_size - new_size).abs)} #{size_change_word})"
+          I18n.locale = old_locale
+        end
+      end
+    end
+  end
+
+  def gzip_file(path)
+    input_file = File.open(path, 'rb').read
+    output_filename = path + '.gz'
+    input_file_time = File.mtime(path)
+
+    # Check if the right file's already there
+    if File.exist?(output_filename) && File.mtime(output_filename) == input_file_time
+      return
+    end
+
+    File.open(output_filename, 'wb') do |f|
+      gz = Zlib::GzipWriter.new(f, Zlib::BEST_COMPRESSION)
+      gz.mtime = input_file_time.to_i
+      gz.write input_file
+      gz.close
+    end
+
+    # Make the file times match, both for Nginx's gzip_static extension
+    # and so we can ID existing files. Also, so even if the GZ files are
+    # wiped out by build --clean and recreated, we won't rsync them over
+    # again because they'll end up with the same mtime.
+    File.utime(File.atime(output_filename), input_file_time, output_filename)
+
+    old_size = File.size(path)
+    new_size = File.size(output_filename)
+
+    [output_filename, old_size, new_size]
+  end
+end