Example for each() Enumerable

my_fasta.rb

class MyFasta
  include Enumerable
  attr :fh

  def initialize(f)
    @fh = File.open(f)
  end

  def self.open(f)
    MyFasta.new(f)
  end
  def rewind
    @fh.rewind
  end

  def next_entry
    return nil if @fh.eof?
    pos = @fh.pos
    e = @fh.readline()
    while([email protected]?)
      pos = @fh.pos
      l = @fh.readline()
      if l[0..0] == ">"
        @fh.pos = pos
        break
      end
      e += l
    end
    e
  end

  def each &block
    while(e = next_entry())
      yield(e)
    end
  end
end

test_fasta = MyFasta.open(ARGV[0])
count = 0
test_fasta.each_with_index do |entry,i|
  puts "#{i} => #{entry.split(/\n/)[0]}"
  puts "********************************"
  count += 1
end
puts "Count = " + count.to_s