From: Chris White <cwprogram@...>
Date: 2011-08-20T04:42:10+09:00
Subject: Re: Searching in a directory


On Aug 19, 2011, at 12:27 PM, Yu Yu wrote:

>  dir_path = 'c:/temp'
>  str = "string"
> 
>  Dir.chdir(dir_path) do
> 
>  Dir.glob("*.txt") do |filename|
>    IO.foreach(filename) do |line|
>      if line =~ /#{str}/
>        puts "#{filename}: #{str}"
>        end
>      end
>    end
>  end

I'm not sure what different action you plan to take if there is a double instance but:

 Dir.glob("test.txt") do |filename|
   IO.foreach(filename).inject(nil) do |last_line, line|
     if line =~ /#{str}/
       puts "#{filename}: #{str}"
       if last_line == line
        puts "Double line"
       end
     end
     line
   end
 end

This basically uses inject to keep a temporary holder of the last line, so you can check if it matches the previous one and take a different course of action for that case. The nil is passed as the initial value to inject so it won't match if the first string is blank.

Regards,
Chris White
http://www.twitter.com/cwgem