Gem::QueryUtils#show_local_gems

# File tmp/rubies/ruby-3.4.1/lib/rubygems/query_utils.rb, line 127
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