require ruby sources from zip files

require_from_zip.rb

#
# Tools to load ruby sources with require from inside compressed zips.
#
# real.sergeych@gmail.com, MIT license. No warranty.
#
require 'rubygems'
require 'zip'

alias require_old require

$require_from_zip_global_binding = binding

# Tool to load ruby dependencies (require) from set of zip files.
# First, pack your directory packs to one or more zip (e.g. vendors/),
# then register it:
#
#    require 'require_from_zip'
#
#    RequireFromZip.register 'zipfile1.zip', 'zipfile2.zip'
#
# now you can require your files from inside these zip as usual.
#
class RequireFromZip

  @zipped = {}

  class Entry < Struct.new(:name, :source)
    def load
      if !@loaded
        eval source, $require_from_zip_global_binding, name
        @loaded = true
        # we don't need it anymore
        self.source = nil
      end
      true
    end
  end

  # Rgister zip files with sources qhich then can be required as usual.
  #
  # @param [Object] one or more zip file names
  def self.register *zipfiles
    zipfiles.each {|x| register_zipfile x}
  end

  private

  def self.register_zipfile x
    Zip::File.open(x) do |zip_file|
      # Handle entries one by one
      zip_file.each do |entry|
        # Extract to file/directory/symlink
        if entry.name.end_with? ('.rb')
          content = entry.get_input_stream.read
          @zipped[entry.name[0...-3]] = Entry.new(entry.name, content)
        end
      end
    end
  end

  def self.do_require name
    e = @zipped[name] and e.load
  end
end

def require name
  RequireFromZip.do_require(name) or require_old(name)
end