rename_to_num_seq.rb

###
#
# this script rename all files in current floder by number sequence
#
###

@start_i = 0
@folder = Dir.pwd

class String
  # colorization
  def colorize(color_code)
    "\e[#{color_code}m#{self}\e[0m"
  end

  def red
    colorize(31)
  end

  def green
    colorize(32)
  end

  def yellow
    colorize(33)
  end

  def pink
    colorize(35)
  end
end

def rename_files params
  i = @start_i
  for file in Dir.entries( @folder )
    file_path = @folder + '/' + file;
    if File.file?( file_path) && File.extname(file_path) == ".#{@ext}"
      number = i.to_s
      # number = '0' + i.to_s if i < 10
      if params[:mode] == 'test'
        puts "will rename #{file} to #{number}.#{@ext}"
      end
      if params[:mode] == 'prepare'
        File.rename( file_path, "#{@folder}/script_backup_#{number}.#{@ext}" )
      end
      if params[:mode] == 'force'
        File.rename( file_path, "#{@folder}/#{number}.#{@ext}" )
      end
      i = i + 1
    end
  end
  if params[:mode] == 'prepare'
    rename_files( mode: 'force' )
  end
end

puts "This script will rename all file"
puts "in #{@folder}"
puts "new name will be a sequence by number.\n"
puts "What\'s the file extention? (with out '.') "

@ext = gets.strip
if @ext.empty?
  puts "canceled, extention must specify.".red
  exit
end

puts "number start: (defalut id 0)"
@start_i = gets.strip.to_i

rename_files( mode: 'test' )
puts "is that alright? y/n"

confirm = gets.strip
if confirm == 'y'
  rename_files( mode: 'prepare' )
  puts "done".green
else
  puts "canceled".yellow
end