# module Gem::VersionOption

Mixin methods for –version and –platform `Gem::Command` options.

### Public Instance Methods

add_platform_option (task = command, *wrap)
Source

    # File lib/rubygems/version_option.rb, line 18
    def add_platform_option(task = command, *wrap)
      Gem::OptionParser.accept Gem::Platform do |value|
        if value == Gem::Platform::RUBY
          value
        else
          Gem::Platform.new value
        end
      end

      add_option("--platform PLATFORM", Gem::Platform,
                 "Specify the platform of gem to #{task}", *wrap) do |value, options|
        unless options[:added_platform]
          Gem.platforms = [Gem::Platform::RUBY]
          options[:added_platform] = true
        end

        Gem.platforms << value unless Gem.platforms.include? value
      end
    end

Add the –platform option to the option parser.

add_prerelease_option (*wrap)
Source

    # File lib/rubygems/version_option.rb, line 41
    def add_prerelease_option(*wrap)
      add_option("--[no-]prerelease",
                 "Allow prerelease versions of a gem", *wrap) do |value, options|
        options[:prerelease] = value
        options[:explicit_prerelease] = true
      end
    end

Add the –prerelease option to the option parser.

add_version_option (task = command, *wrap)
Source

    # File lib/rubygems/version_option.rb, line 52
    def add_version_option(task = command, *wrap)
      Gem::OptionParser.accept Gem::Requirement do |value|
        Gem::Requirement.new(*value.split(/\s*,\s*/))
      end

      add_option("-v", "--version VERSION", Gem::Requirement,
                 "Specify version of gem to #{task}", *wrap) do |value, options|
        # Allow handling for multiple --version operators
        if options[:version] && !options[:version].none?
          options[:version].concat([value])
        else
          options[:version] = value
        end

        explicit_prerelease_set = !options[:explicit_prerelease].nil?
        options[:explicit_prerelease] = false unless explicit_prerelease_set

        options[:prerelease] = value.prerelease? unless
          options[:explicit_prerelease]
      end
    end

Add the –version option to the option parser.

get_platform_from_requirements (requirements)
Source

    # File lib/rubygems/version_option.rb, line 77
    def get_platform_from_requirements(requirements)
      Gem.platforms[1].to_s if requirements.key? :added_platform
    end

Extract platform given on the command line