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

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# 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)
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total_savings = 0
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
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total_savings += (old_size - new_size)
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
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builder.say_status :gzip, "Total gzip savings: #{number_to_human_size(total_savings)}", :blue
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