renameall

#!/usr/bin/env ruby
# Start Date: Monday May 26, 2008
# Current Version: 0.9
# Author: Joseph Pecoraro
# Contact: joepeck02@gmail.com
# Decription: Quick and easy way to change the extension of all the
# files in a directory.  Ideas for improvements are welcome.

# Wrapper around the functionality
class Renamer
  
  attr_accessor :from_extension, :to_extension
  
  # Quickly set the from and to extension
  def initialize(from_extension, to_extension)
    @from_extension, @to_extension = from_extension, to_extension
  end

  # Rename all the files in a given directory
  # Default to the current directory
  def rename_all_in_dir(dir="./")
    Dir.glob(dir + "*.#{@from_extension}").each do |f|
      changeTo = File.basename(f,@from_extension) + @to_extension
      if File.exists? changeTo
        puts "Warning: #{f.sub(dir,'')}: Did not change because #{changeTo} already existed!"
      else
    	  File.rename(f, changeTo)
    	end
    end
  end

end

# When run as as script
if $0 == __FILE__
  if ARGV.size != 2
    program_name = $0.split(/\//).last
    puts "usage: #{program_name} from_extension to_extension\nExample: #{program_name} rhtml haml - changes the extension of all .rhtml files to .haml"
  else
    Renamer.new(ARGV[0], ARGV[1]).rename_all_in_dir
  end
end