ruby:rename_file

rename_file.rb

#!/usr/bin/env ruby -Ku
# -*- encoding: utf-8 -*-

def main
   batch_name, file_type = user_inputs
  
   cnt = 0
   Dir["*.#{file_type}"].each_with_index do |file, i|
     new_name = "#{batch_name}#{i+1}.#{file_type}"
     unless File.exist?(new_name)
       File.rename(file, new_name)
       cnt += 1
     end
   end
   puts "#{cnt} files renamed."
rescue => e
  puts e
end

def user_inputs
  batch_name = ARGV[0] || (print "Input batch name: "; STDIN.gets.chomp)

  file_type = ARGV[1] || (print "Input target file type: "; STDIN.gets.downcase.chomp)

  puts "Filename: '#{batch_name}[number].#{file_type}' OK? (y|n)"
  exit unless STDIN.gets =~ /^y/i
  return batch_name, file_type
end

main