module Thanks

# File lib/thanks.rb, line 34
def self.bundled_gems
  @_bundled_gems ||= `bundle list`
                     .split("\n")
                     .drop(1).map(&:split)
                     .map { |words| words.drop(1) }
                     .map(&:first)
end

# File lib/thanks.rb, line 21
def self.matches
  registry = Registry.new.fetch

  @_matches ||= registry.select do |name, _url|
    system_gems.include?(name) ||
      bundled_gems.include?(name)
  end
end

# File lib/thanks.rb, line 6
def self.print_list
  if matches.any?
    puts "\nSweet! You are using gems with donation pages!\n\n"
    matches.sort.each { |name, url| puts " - #{name}\t#{url}" }
  else
    puts "\nMan! Can't find any gems on your system to support!"
  end

  puts "\nYou can also donate to help the Ruby language itself"
  puts "\thttps://bugs.ruby-lang.org/projects/ruby/wiki/Donation"

  puts "\nAdd more gem donation links to our list at"
  puts "\thttps://github.com/dpritchett/thanks-ruby"
end

# File lib/thanks.rb, line 30
def self.system_gems
  @_system_gems ||= `gem list`.split("\n").map(&:split).map(&:first)
end