Search for gem which supports only ruby 2.6

gem_search.rb

require 'rubygems'
require 'open-uri'
require 'ruby-progressbar'
require 'pry'

specs = Marshal.load(Gem.gunzip(File.read("./latest_specs.4.8.gz")))
total = specs.length

pb = ProgressBar.create(
  :title => "Searching",
  :starting_at => 0,
  :progress_mark => '>',
  :remainder_mark => '#',
  :format => '%t(%c/%C): S%BE :%t',
  :total => total,
  :length => 50
)

specs.each do |gem_name, gem_version, _|
  pb.progress += 1
  begin
    compressed = open("https://rubygems.org/quick/Marshal.4.8/#{gem_name}-#{gem_version}.gemspec.rz").read
    inflated = Gem.inflate(compressed)
    spec = Marshal.load(inflated)
    ruby1_8 = Gem::Version.new("1.8.7")
    ruby1_9 = Gem::Version.new("1.9.3")
    ruby2_0 = Gem::Version.new("2.0.0")
    ruby2_1 = Gem::Version.new("2.1.0")
    ruby2_2 = Gem::Version.new("2.2.0")
    ruby2_3 = Gem::Version.new("2.3.0")
    ruby2_4 = Gem::Version.new("2.4.0")
    ruby2_5 = Gem::Version.new("2.5.0")
    ruby2_5_1 = Gem::Version.new("2.5.1")
    ruby2_5_2 = Gem::Version.new("2.5.2")
    ruby2_5_3 = Gem::Version.new("2.5.3")
    ruby2_6 = Gem::Version.new("2.6.0")
    old_versions = [ruby1_8, ruby1_9, ruby2_0, ruby2_1,
                    ruby2_2, ruby2_3, ruby2_4, ruby2_5,
                    ruby2_5_1, ruby2_5_2, ruby2_5_3]
    required = spec.required_ruby_version
    if old_versions.all?{|v| !required.satisfied_by?(v) } && required.satisfied_by?(ruby2_6)
      puts "#{gem_name}-#{gem_version}"
    end
  rescue => e
    puts "#{gem_name}: #{e.message}"
  end
end
pb.finish