空行で区切られた要素に対してgrepする

multiline_grep.rb

#!/usr/bin/env ruby
# -*- encoding: utf-8 -*-

=begin
空行で区切られた要素に対してgrepする
=end

if ARGV.length < 2
  puts "<usage> ruby multiline_grep.rb [search_file] [search_text1] [search_text2] ..."
  exit
end

class String
  # substrsの中身を全て含んでいるかどうか
  def all_include?(substrs)
    substrs.each do|str|
      return false unless self.include? str
    end
    true
  end
end

search_file = ARGV[0]

$search_texts = ARGV.clone
$search_texts.shift

$count = 0

def check_all_include(str)
  if str.all_include?($search_texts)
    $count += 1
    puts str
    puts ""
  end
end

File.open(search_file) do |file|
  line_buffer = ""
  while line = file.gets
    if line.strip.length == 0
      check_all_include(line_buffer)
      line_buffer.clear
    else
      line_buffer += line
    end
  end

  if line_buffer.length > 0
    check_all_include(line_buffer)
  end
end

puts "hit count = #{$count}"