Class: Gem::Commands::SpecificationCommand

Inherits:
Gem::Command show all
Includes:
LocalRemoteOptions, VersionOption
Defined in:
lib/rubygems/commands/specification_command.rb

Instance Attribute Summary

Attributes inherited from Gem::Command

#command, #defaults, #options, #program_name, #summary

Instance Method Summary collapse

Methods included from VersionOption

#add_platform_option, #add_prerelease_option, #add_version_option, #get_platform_from_requirements

Methods included from LocalRemoteOptions

#accept_uri_http, #add_bulk_threshold_option, #add_clear_sources_option, #add_local_remote_options, #add_proxy_option, #add_source_option, #add_update_sources_option, #both?, #local?, #remote?

Methods inherited from Gem::Command

add_common_option, #add_extra_args, #add_option, add_specific_extra_args, #begins?, build_args, build_args=, #check_deprecated_options, common_options, #deprecate_option, #deprecated?, extra_args, extra_args=, #get_all_gem_names, #get_all_gem_names_and_versions, #get_one_gem_name, #get_one_optional_argument, #handle_options, #handles?, #invoke, #invoke_with_build_args, #merge_options, #remove_option, #show_help, #show_lookup_failure, specific_extra_args, specific_extra_args_hash, specific_extra_args_hash=, #when_invoked

Methods included from UserInteraction

#alert, #alert_error, #alert_warning, #ask, #ask_for_password, #ask_yes_no, #choose_from_list, #say, #terminate_interaction, #verbose

Methods included from DefaultUserInteraction

ui, #ui, ui=, #ui=, use_ui, #use_ui

Methods included from Text

#clean_text, #format_text, #levenshtein_distance, #min3, #truncate_text

Constructor Details

#initialize ⇒ SpecificationCommand

Returns a new instance of SpecificationCommand.



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# File 'lib/rubygems/commands/specification_command.rb', line 11

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

Instance Method Details

#arguments ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/specification_command.rb', line 42

def arguments # :nodoc:
  <<-ARGS
GEMFILE       name of gem to show the gemspec for
FIELD         name of gemspec field to show
  ARGS
end

#defaults_str ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/specification_command.rb', line 49

def defaults_str # :nodoc:
  "--local --version '#{Gem::Requirement.default}' --yaml"
end

#description ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/specification_command.rb', line 53

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

#execute ⇒ Object

Raises:



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# File 'lib/rubygems/commands/specification_command.rb', line 73

def execute
  specs = []
  gem = options[:args].shift

  unless gem
    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?
    if File.exist? gem
      specs << Gem::Package.new(gem).spec rescue nil
    end

    if specs.empty?
      specs.push(*dep.matching_specs)
    end
  end

  if remote?
    dep.prerelease = options[:prerelease]
    found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep

    specs.push(*found.map {|spec,| spec })
  end

  if specs.empty?
    alert_error "No gem matching '#{dep}' found"
    terminate_interaction 1
  end

  platform = get_platform_from_requirements(options)

  if platform
    specs = specs.select{|s| s.platform.to_s == platform }
  end

  unless options[:all]
    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

#usage ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/specification_command.rb', line 69

def usage # :nodoc:
  "#{program_name} [GEMFILE] [FIELD]"
end