methods in blocks

gistfile1.rb

class NginxLog
    [snip]

    def read
      raw = read_source
      raw.extend(Seeder::LazyEnumerable)
      entries = raw.take_with_block(@count, &:interesting?)
      raw.map { |entry| parse_entry(entry) }
    end

    def interesting?(line)
      line !~ /\/status\/heartbeat / && line =~ /GET/
    end
end


module Seeder
  module LazyEnumerable


    # Public: Like Enumerable#take, but only takes the items for which
    # the block is true.  This can only be mixed in to objects that
    # already mixin Enumerable.
    #
    # count - an Integer; the number of entries you want.
    # block - we'll only return objects for which this is true.
    #
    # Examples:
    #
    #    a = [1, 2, 3, 4, 5, 6]
    #    a.extend(Seeder::LazyEnumerable)
    #    a.take_with_block(2) { |x| x.even? }
    #    #=> [2, 4]
    #    a.take_with_block(10, :&odd?)
    #    #=> [1, 3, 5]
    #
    # Returns an Enumerable (presumably of the kind you passed in.
    def take_with_block(count, &block)
      array = self.dup

      results = []
      array.each do |entry|
        if yield(entry)
          results.push entry if results.count < count
          break if results.count >= count
        end
      end

      results
    end
  end
end