Word count with Ruby

word_count.rb

def open_file(filename)
    word_list = []
    aFile = File.open(filename, "r+")
    aFile.each do |line|
        list = line.split(" ")
        list.each do |word|
            word_list << word
        end
    end
    aFile.close
    return word_list
end


def make_dictionary(list_words)
    word_dict = Hash.new(0)
    list_words.each do |word|
        word_dict[word] += 1
    end
  
    return word_dict
end


def main(filename)
    word_list = open_file(filename)
    word_dict = make_dictionary(word_list)

    return word_dict.sort
end