def execute
specs = []
gem = options[:args].shift
unless gem then
raise Gem::CommandLineError,
"Please specify a gem name or file on the command line"
end
dep = Gem::Dependency.new gem, options[:version]
field = get_one_optional_argument
if field then
field = field.intern
if options[:format] == :ruby then
raise Gem::CommandLineError, "--ruby and FIELD are mutually exclusive"
end
unless Gem::Specification.attribute_names.include? field then
raise Gem::CommandLineError,
"no field %p on Gem::Specification" % field.to_s
end
end
if local? then
if File.exist? gem then
specs << Gem::Format.from_file_by_path(gem).spec rescue nil
end
if specs.empty? then
specs.push(*Gem.source_index.search(dep))
end
end
if remote? then
found = Gem::SpecFetcher.fetcher.fetch dep
specs.push(*found.map { |spec,| spec })
end
if specs.empty? then
alert_error "Unknown gem '#{gem}'"
terminate_interaction 1
end
output = lambda do |s|
s = s.send field if field
say case options[:format]
when :ruby then s.to_ruby
when :marshal then Marshal.dump s
else s.to_yaml
end
say "\n"
end
if options[:all] then
specs.each(&output)
else
spec = specs.sort_by { |s| s.version }.last
output[spec]
end
end