ren.rb - rename by the regular expressions

ren.rb

#!/usr/bin/env ruby
#
# ren.rb - rename by the regular expressions
# Copyright (c) 2016 Koichi OKADA. All rights reserved.
# This script is distributed under the MIT license.
#

require 'optparse'

$config = {
  :i => "",
}
pat = /./
rep = '\0'
opts = OptionParser.new
opts.banner  = "Usage: #{File.basename $0} [options ...] filename ..."
opts.banner << <<'END'

  This script only output rename operations with mv command.

  PATTERN can take the regular expressions.
  REPLACE can take special escape sequences.
    \&, \0    is the matched string
    \1 ... \9 is the n th matched group
    \`, \'    is pre and post string of matched
    \+        is last matched group
  options:
END
opts.on("-p PATTERN") {|v| pat = Regexp.new v}
opts.on("-r REPLACE") {|v| rep = v}
opts.on("-i", "interactive") {|v| $config[:i] = "-i "}
opts.parse!

ARGV.each do |v|
  if pat =~ v
    puts "mv -v -- #{$config[:i]}\"#{v.gsub(/"/,'\"')}\" \"#{v.gsub(pat, rep).gsub(/"/,'\"')}\""
  end
end