show_version(*pkgs) public

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# File lib/optparse/version.rb, line 5
  def show_version(*pkgs)
    progname = ARGV.options.program_name
    result = false
    show = proc do |klass, cname, version|
      str = "#{progname}"
      unless klass == ::Object and cname == :VERSION
        version = version.join(".") if Array === version
        str << ": #{klass}" unless klass == Object
        str << " version #{version}"
      end
      [:Release, :RELEASE].find do |rel|
        if klass.const_defined?(rel)
          str << " (#{klass.const_get(rel)})"
        end
      end
      puts str
      result = true
    end
    if pkgs.size == 1 and pkgs[0] == "all"
      self.search_const(::Object, /\AV(?:ERSION|ersion)\z/) do |klass, cname, version|
        unless cname[1] == ee and klass.const_defined?(:Version)
          show.call(klass, cname.intern, version)
        end
      end
    else
      pkgs.each do |pkg|
        begin
          pkg = pkg.split(/::|\//).inject(::Object) {|m, c| m.const_get(c)}
          v = case
              when pkg.const_defined?(:Version)
                pkg.const_get(n = :Version)
              when pkg.const_defined?(:VERSION)
                pkg.const_get(n = :VERSION)
              else
                n = nil
                "unknown"
              end
          show.call(pkg, n, v)
        rescue NameError
        end
      end
    end
    result
  end
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