Rename files with given prefix and a file index from sort by creation date

dr.rb

#!/usr/bin/env ruby

begin
  require "mini_magick"
rescue LoadError => e
  abort <<-MESSAGE
Missing `mini_magick`, try installing with:
    sudo zypper in ruby2.5-rubygem-mini_magick
    # OR
    gem install mini_magick
MESSAGE
end

require 'time'

if ARGV.length < 2
then abort "Usage: dsort NOWA_NAZWA pliki*"
end

offset = 1
name_pattern = ARGV.shift
count = ARGV.count + offset
name_formatter = "#{name_pattern}%0#{count.to_s.length}d%s"
prog_formatter = "\r\e[0K%s: %0#{count.to_s.length}d/#{count}"

images = 
ARGV.each_with_index.map do |image_name, index|
  print prog_formatter % ["Reading date", index + offset]
  $stdout.flush

  image = MiniMagick::Image.new(image_name)
  exif_date = [
	image.exif["DateTime"],
	image.exif["DateTimeDigitized"],
	image.exif["DateTimeOriginal"]
  ].compact.min

  image_date = Time.parse(
    if
      exif_date
    then
      exif_date.gsub(/^(\d{4}):(\d{2}):(\d{2})/, '\1-\2-\3')
    else
      [
        image.data["properties"]["date:create"],
        image.data["properties"]["date:modify"]
      ].min
	end
  )
  [image_date, image_name]
end

images.sort.each_with_index do |(image_date, image_name), index|
  new_name = name_formatter % [index+offset, File.extname(image_name)]
  print (prog_formatter % ["Renaming file", index + offset]) + " " + image_name + " => " + new_name
  $stdout.flush
  File.rename(image_name,  new_name)
end

puts "Renamed #{count} files."