Ruby script used to move and reorder pdf files with a date in name

move_files_with_date.rb

require 'fileutils'
require 'byebug'

# What it do
# ============
# It parse the 'dir' directory searching for
# pdf files with name matching the "xxx yyy - 2017-04-16" 
# pattern and move them into a date named folder
# (like '2017-04-16')

# before: -------
# dir/
#   Pinocchio.pdf
#   Cenerentola - 2017-01-31.pdf
#   Gatto con gli stivali - 2017-01-31.zip
#   Biancaneve - 2017-01-31.pdf
#   Cappuccetto rosso - 2017-02-16.pdf

# after: --------
# dir/
#   Pinocchio.pdf
#   Gatto con gli stivali - 2017-01-31.zip
#   2017-01-31/
#     Cenerentola - 2017-01-31.pdf
#     Biancaneve - 2017-01-31.pdf      
#   2017-02-16/
#     Cappuccetto rosso - 2017-02-16.pdf

dir = File.expand_path(File.dirname(__FILE__))

dir = "/Volumes/Discolo 1/Stampa"


def get_date(filename)
  m = /.+ \- (\d{4}\-\d{2}\-\d{2})$/.match File.basename(filename, ".pdf")
  if m && m[1]
    m[1]
  else
    nil
  end
end


Dir.chdir dir
pdfs = Dir.glob("*.pdf")
puts "Found #{pdfs.size} .pdf files in directory."

pdfs.each do |file|
  if date = get_date(file)
    Dir.mkdir(date) if !Dir.exists?(date)
    dest = "#{date}/#{file}"
    FileUtils.mv(file, dest) if !File.exists?(dest)
  end
end