• From: Belgium
  • Registered: 2008-11-25
  • Posts: 1,357

Topic: Read a file, replace some value and write it back

How to achieve that functionality? I believed that gsub! in a block will write the changes automatically, but it is not the case:

pattern = /\.(png|gif|jpg)/
locale_suffix = "_fr"

Dir.foreach(Dir.pwd ) do |filename|
  unless File.directory?(filename)
    File.open(filename, "r+") do |file|
      while line = file.gets
        match = pattern.match(line)
        if(match)
          line.gsub!(pattern, locale_suffix << match[0])
        end
      end      
    end
  end
end

Or there is the only and may be the best solution by using a temporary file for writing, and then remove the original file and rename the temporary one?

Last edited by Javix (2012-02-20 10:40:10)