get the notes of every episode from the episodes table

getnote.rake

# encoding: UTF-8
namespace :db do
  desc "get all of the notes from episodes table"
  task :episodes => :environment do
    def header(name)
      str = <<-EOF.gsub(/^\s{6}/, '')
      ---
      layout: post
      title: #{name}
      ---
      EOF
    end

    root = File.expand_path(File.dirname(__FILE__))
    dir = File.join(root, 'notes')
    system("mkdir #{dir}")

    Episode.all.each do |e|
      next if [105, 104, 103].include? e.id

      prefix = case e.id
        when 1..9
          '00'
        when 10..99
          '0'
        else
          ''
        end
      file = prefix + e.id.to_s + '-' + e.name + '.md'

      if e.notes.empty?
        notes = ''
      else
        notes = e.notes.gsub(/^```.*?$/, '~~~').
          gsub(/(^~~~$)\n(^~~~$)/, "\\1\n\n\\2").
          gsub(/\r\n?/, "\n").chomp + "\n\n"
      end

      File.open("#{dir}/#{file}", 'w+') do |f|
        f.write(header(e.name) + notes)
      end
    end
  end
end