'bundle outdated' extracted into a method

bundle_outdated.rb

require 'bundler'

def outdated?(options = {})
  gems = Array(options[:gems])
  sources = Array(options[:source])

  Bundler.definition.validate_ruby!
  current_specs = Bundler.load.specs

  if gems.empty? && sources.empty?
    # We're doing a full update
    definition = Bundler.definition(true)
  else
    definition = Bundler.definition(:gems => gems, :sources => sources)
  end 
  options[:local] ? definition.resolve_with_cache! : definition.resolve_remotely!

  # Loop through the current specs
  current_specs.sort_by { |s| s.name }.each do |current_spec|
    next if !gems.empty? && !gems.include?(current_spec.name)

    active_spec = definition.index[current_spec.name].sort_by { |b| b.version }

    if !current_spec.version.prerelease? && !options[:pre] && active_spec.size > 1 
      active_spec = active_spec.delete_if { |b| b.respond_to?(:version) && b.version.prerelease? }
    end 

    active_spec = active_spec.last
    next if active_spec.nil?

    gem_outdated = Gem::Version.new(active_spec.version) > Gem::Version.new(current_spec.version)
    git_outdated = current_spec.git_version != active_spec.git_version
    if gem_outdated || git_outdated
      return true
    end 
  end 
  return false
end

# When Gemfile contains 'highline' . '0.4.0'
puts outdated?({gems: ['highline']}) #=> true

# When Gemfile contains 'highline' . '1.6.16'
puts outdated?({gems: ['highline']}) #=> false

# To check all the gems
puts outdated?