i15r idea

visitor_pattern_idea.rb

module I15r; end

module Visitable
  def accept(visitor)
    visitor.send visitor_method_name, self
  end

  def visitor_method_name
    "visit_#{self.class.name}".gsub(/::/, "__")
  end
end

class I15r::Line < String
  include Visitable
end

class I15r::File
  include Visitable

  def initialize file
    @file = file
    @lines = File.readlines(file).map{|l| I15r::Line.new l }
  end

    def to_s
      @file.to_s
    end


  def accept(visitor)
    super
    @lines.each{|e| e.accept visitor }
  end
end

class I15r::Path
  include Visitable

  def initialize(path)
    @path = path
    files = Dir.glob(File.join path, "**/*.haml") +
            Dir.glob(File.join path, "**/*.erb")

    @files = files.map{|f| I15r::File.new(f) }
  end

  def to_s
    @path.to_s
  end

  def accept(visitor)
    super
    @files.each{|e| e.accept visitor }
  end
end

class I15r::TextReplacementPrintVisitor
  def visit_I15r__Line line
    puts "#{self.class.name} Replacing text of " + line.to_s
  end

  def visit_I15r__File file
    puts "#{self.class.name} Visiting file #{file}"
  end

  def visit_I15r__Path path
    puts "#{self.class.name} Visiting path #{path}"
  end
end

class I15r::LocaleFileWriterVisitor
  def visit_I15r__Line line
    puts "#{self.class.name} Writing Locale for #{line}"
  end

  def visit_I15r__File file
    puts "#{self.class.name} Opening #{file} for locale writing"
  end

  def visit_I15r__Path path
    puts "#{self.class.name} Starting finding files in #{path}"
  end
end

path =  I15r::Path.new("spec/support")
path.accept(I15r::TextReplacementPrintVisitor.new());
path.accept(I15r::LocaleFileWriterVisitor.new());

To get the gist to run, it expects erb or haml templates in spec/support