rename-files

#!/usr/bin/env ruby -w

# Rename all files in the directory. The new names will be generated from a basename.
#
# AUTHOR: Daniel Lopes
#         October 20, 2009
#
# USAGE:
#   rename-files . base_name.jpg #=> base_name1.jpg, base_name2.jpg, etc
require "pathname"

unless ARGV[0]
  puts "USAGE: rename-files directory new_name.jpg"
  puts "RESULT: new_name1.jpg, new_name2.jpg, etc"
else
  source_path = ARGV[0]
  files = Dir.entries(source_path)
  name_pattern = (ARGV[1]) ? Pathname.new(ARGV[1]) : nil

  count = 1
  files.each do |f|
    next if f == "." or f == ".." or f =~ /^\./
    file = Pathname.new(f)    
    extension = file.extname
    extension = name_pattern.extname  if !name_pattern.nil? && (file.extname != name_pattern.extname)

    new_name = "#{File.basename(name_pattern, '.*') if !name_pattern.nil?}#{count.to_s}#{extension}".downcase
    File.rename(source_path+"/"+f, source_path+"/"+new_name)
    puts "rename #{f} to #{new_name}"
    count+=1
  end

end