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require 'rubygems/command'
require 'rubygems/local_remote_options'
require 'rubygems/version_option'
require 'rubygems/package'
class Gem::Commands::SpecificationCommand < Gem::Command
include Gem::LocalRemoteOptions
include Gem::VersionOption
def initialize
Gem.load_yaml
super 'specification', 'Display gem specification (in yaml)',
:domain => :local, :version => Gem::Requirement.default,
:format => :yaml
add_version_option('examine')
add_platform_option
add_prerelease_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 YAML 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 description # :nodoc:
<<-EOF
The specification command allows you to extract the specification from
a gem for examination.
The specification can be output in YAML, ruby or Marshal formats.
Specific fields in the specification can be extracted in YAML format:
$ gem spec rake summary
--- Ruby based make-like utility.
...
EOF
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
case v = options[:version]
when String
req = Gem::Requirement.create v
when Gem::Requirement
req = v
else
raise Gem::CommandLineError, "Unsupported version type: '#{v}'"
end
if !req.none? and options[:all]
alert_error "Specify --all or -v, not both"
terminate_interaction 1
end
if options[:all]
dep = Gem::Dependency.new gem
else
dep = Gem::Dependency.new gem, req
end
field = get_one_optional_argument
raise Gem::CommandLineError, "--ruby and FIELD are mutually exclusive" if
field and options[:format] == :ruby
if local? then
if File.exist? gem then
specs << Gem::Package.new(gem).spec rescue nil
end
if specs.empty? then
specs.push(*dep.matching_specs)
end
end
if remote? then
dep.prerelease = options[:prerelease]
found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep
specs.push(*found.map { |spec,| spec })
end
if specs.empty? then
alert_error "No gem matching '#{dep}' found"
terminate_interaction 1
end
unless options[:all] then
specs = [specs.max_by { |s| s.version }]
end
specs.each 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
end
end
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