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require 'yaml'
require 'rubygems/command'
require 'rubygems/local_remote_options'
require 'rubygems/version_option'
require 'rubygems/source_info_cache'
require 'rubygems/format'
class Gem::Commands::SpecificationCommand < Gem::Command
include Gem::LocalRemoteOptions
include Gem::VersionOption
def initialize
super 'specification', 'Display gem specification (in yaml)',
:domain => :local, :version => Gem::Requirement.default,
:format => :yaml
add_version_option('examine')
add_platform_option
add_option('--all', 'Output specifications for all versions of',
'the gem') do |value, options|
options[:all] = true
end
add_option('--ruby', 'Output ruby format') do |value, options|
options[:format] = :ruby
end
add_option('--yaml', 'Output RUBY format') do |value, options|
options[:format] = :yaml
end
add_option('--marshal', 'Output Marshal format') do |value, options|
options[:format] = :marshal
end
add_local_remote_options
end
def arguments # :nodoc:
<<-ARGS
GEMFILE name of gem to show the gemspec for
FIELD name of gemspec field to show
ARGS
end
def defaults_str # :nodoc:
"--local --version '#{Gem::Requirement.default}' --yaml"
end
def usage # :nodoc:
"#{program_name} [GEMFILE] [FIELD]"
end
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
end
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