Check what kind of spec data are saved in Marshal.4.8.Z

gistfile1.rb

#!/usr/bin/ruby
# Check what kind of spec data are saved in http://rubygems.org/Marshal.4.8.Z
require 'rubygems'
require 'pp'

# wget http://rubygems.org/Marshal.4.8.Z if needed
gems = Marshal.load(Gem.inflate(File.read("./Marshal.4.8.Z")))

SPEC_PARAMS = %w[ author authors name platform require_paths rubygems_version summary
                  license licenses bindir cert_chain description email executables
                  extensions homepage metadata post_install_message rdoc_options
                  required_ruby_version required_rubygems_version requirements
                  signing_key has_rdoc date version ].sort
SPEC_FILES_PARAMS = %w[ files test_files extra_rdoc_files ]
DEPENDENCY_PARAMS = %w[ dependencies ]

PARAMS = SPEC_PARAMS + SPEC_FILES_PARAMS + DEPENDENCY_PARAMS
included = []

PARAMS.each do |param|
  gems.each do |gem|
    name = gem[0]
    spec = gem[1]
    if spec.respond_to? :"#{param}"
      value = spec.send(:"#{param}")
      if value
        if value.respond_to? :'empty?'
          next if value.empty?
        end
        included << param
        break
      end
    end
  end
end
puts 'Included:'
pp included
puts 'Not included:'
pp (PARAMS - included)

#=======================================================
# Results
#=======================================================

Included:
["author",
 "authors",
 "bindir",
 "date",
 "description",
 "has_rdoc",
 "name",
 "platform",
 "require_paths",
 "required_ruby_version",
 "required_rubygems_version",
 "rubygems_version",
 "summary",
 "version",
 "dependencies"]
Not included:
["cert_chain",
 "email",
 "executables",
 "extensions",
 "homepage",
 "license",
 "licenses",
 "metadata",
 "post_install_message",
 "rdoc_options",
 "requirements",
 "signing_key",
 "files",
 "test_files",
 "extra_rdoc_files"]