# File lib/rubygems/commands/specification_command.rb, line 13
13:   def initialize
14:     super 'specification', 'Display gem specification (in yaml)',
15:           :domain => :local, :version => Gem::Requirement.default,
16:           :format => :yaml
17: 
18:     add_version_option('examine')
19:     add_platform_option
20: 
21:     add_option('--all', 'Output specifications for all versions of',
22:                'the gem') do |value, options|
23:       options[:all] = true
24:     end
25: 
26:     add_option('--ruby', 'Output ruby format') do |value, options|
27:       options[:format] = :ruby
28:     end
29: 
30:     add_option('--yaml', 'Output RUBY format') do |value, options|
31:       options[:format] = :yaml
32:     end
33: 
34:     add_option('--marshal', 'Output Marshal format') do |value, options|
35:       options[:format] = :marshal
36:     end
37: 
38:     add_local_remote_options
39:   end

     # File lib/rubygems/commands/specification_command.rb, line 57
 57:   def execute
 58:     specs = []
 59:     gem = options[:args].shift
 60: 
 61:     unless gem then
 62:       raise Gem::CommandLineError,
 63:             "Please specify a gem name or file on the command line"
 64:     end
 65: 
 66:     dep = Gem::Dependency.new gem, options[:version]
 67: 
 68:     field = get_one_optional_argument
 69: 
 70:     if field then
 71:       field = field.intern
 72: 
 73:       if options[:format] == :ruby then
 74:         raise Gem::CommandLineError, "--ruby and FIELD are mutually exclusive"
 75:       end
 76: 
 77:       unless Gem::Specification.attribute_names.include? field then
 78:         raise Gem::CommandLineError,
 79:               "no field %p on Gem::Specification" % field.to_s
 80:       end
 81:     end
 82: 
 83:     if local? then
 84:       if File.exist? gem then
 85:         specs << Gem::Format.from_file_by_path(gem).spec rescue nil
 86:       end
 87: 
 88:       if specs.empty? then
 89:         specs.push(*Gem.source_index.search(dep))
 90:       end
 91:     end
 92: 
 93:     if remote? then
 94:       found = Gem::SpecFetcher.fetcher.fetch dep
 95: 
 96:       specs.push(*found.map { |spec,| spec })
 97:     end
 98: 
 99:     if specs.empty? then
100:       alert_error "Unknown gem '#{gem}'"
101:       terminate_interaction 1
102:     end
103: 
104:     output = lambda do |s|
105:       s = s.send field if field
106: 
107:       say case options[:format]
108:           when :ruby then s.to_ruby
109:           when :marshal then Marshal.dump s
110:           else s.to_yaml
111:           end
112: 
113:       say "\n"
114:     end
115: 
116:     if options[:all] then
117:       specs.each(&output)
118:     else
119:       spec = specs.sort_by { |s| s.version }.last
120:       output[spec]
121:     end
122:   end