Sorting Hugo markdown based posts into subfolder according to their year in the date-header-tag

sort.rb

#! /usr/bin/env ruby
require 'fileutils'

posts = Dir.glob("blog/content/post/*.md")
posts.each do |item|
  File.open(item, "r").each do |line|
    if line =~ /^date = (\d+)-(\d+)-(\d+)T(\d+):(\d+):(\d+).*/
      year = $1
      puts "#{item}: #{year}"
      FileUtils.mv(item, "blog/content/post/#{year}")
    end
  end
end