module Gem::QueryUtils

def show_local_gems(name, req = Gem::Requirement.default)
  display_header("LOCAL")
  specs = Gem::Specification.find_all do |s|
    name_matches = name ? s.name =~ name : true
    version_matches = show_prereleases? || !s.version.prerelease?
    name_matches && version_matches
  end.uniq(&:full_name)
  spec_tuples = specs.map do |spec|
    [spec.name_tuple, spec]
  end
  output_query_results(spec_tuples)
end