Wordle solver

wordle.rb

words = []
letters = ("a".."z").to_a

File.foreach("/usr/share/dict/words", chomp: true) do |word|
  words << word.downcase if word.match?(/\A[a-z]{5}\z/i)
end

while words.length > 1
  weights = letters.to_h { |letter| [letter, 0] }  
  words.each do |word|
    word.each_char { |letter| weights[letter] += 1 if weights.key?(letter) }
  end

  values = words.to_h { |word| [word, word.each_char.uniq.sum { |letter| weights.fetch(letter, 0) }] }
  guess = values.sort_by { |word, value| -value }.first.first

  print "#{guess} (%05d)> " % words.length
  input = gets.chomp.downcase

  case input
  when "?"
    words.delete(guess)
  when "l", "letters"
    p letters
  when "w", "words"
    p words
  when "q", "quit"
    exit
  when /[_gy]{5}/
    input.each_char.zip(guess.each_char).each_with_index do |(action, letter), index|
      case action
      when "_"
        words.reject! { |word| word.include?(letter) }
        letters.delete(letter)
      when "g"
        words.reject! { |word| word[index] != letter }
        letters.delete(letter)
      when "y"
        words.reject! { |word| !word.include?(letter) || word[index] == letter }
      end
    end
  end
end

puts "The word is: #{words.first}"