deivid-rodriguez/byebug

#!/usr/bin/env ruby
# frozen_string_literal: true

require "rubygems"

m = Module.new do
  extend self

  def gemfile
    File.expand_path("../Gemfile", __dir__)
  end

  def lockfile
    "#{gemfile}.lock"
  end

  def lockfile_version
    return unless File.file?(lockfile)

    lockfile_contents = File.read(lockfile)

    regexp = /\n\nBUNDLED WITH\n\s{2,}(#{Gem::Version::VERSION_PATTERN})\n/

    regexp.match(lockfile_contents)[1]
  end

  def bundler_version
    @bundler_version ||= lockfile_version
  end

  def load_bundler!
    ENV["BUNDLE_GEMFILE"] ||= gemfile

    activate_bundler(bundler_version)
  end

  def activate_bundler(bundler_version)
    gem "bundler", bundler_version
  end
end

m.load_bundler!