Meli email client, pre-alpha release(meli.delivery)

  -- crontab -e
  -- 0 * * * * /usr/local/bin/imapfilter

  function main ()

      -- See 'man imapfilter_config' for an explanation of
      -- imapfilter options and functions.

      -- Some config examples:
      -- https://github.com/lefcha/imapfilter/blob/master/samples/config.lua
      -- https://gist.github.com/dylanwh/408810
      -- http://www.npcglib.org/~stathis/blog/2012/07/09/linux-task-sorting-mail-with-imapfilter/

      -- General Options
      options.timeout = 120
      options.subscribe = true

      -- Accounts
      {%- for v in ACCOUNTS | from_json %}
      local {{ v.serverName }} = IMAP {
          server = '{{ v.server }}',
          username = '{{ v.username }}',
          password = '{{ v.password }}',
          ssl = '{{ v.ssl }}'
      }

      {%- endfor %}

      -- GMAIL
      -- Gmail behaves differently to normal imap. With a normal imap acccount
      -- you can simply use move_messages(). Google stores both inbox
      -- and sent email in the "[Gmail]/All Mail" folder. An email sent to yourself
      -- from the same email address exists as a single email and is visible in
      -- the Inbox and Sent box. If you delete the inbox mail then the sent mail
      -- is also deleted. Thus it is only safe to delete mail once both the Inbox
      -- and Sent box is copied.

      -- Only go ahead and copy inbox/sent/spam from gmail if I have received
      -- some Inbox email.
      if (gmail['Inbox']:check_status() > 0) then
          inbox_mail = gmail["Inbox"]:select_all()
          inbox_copy_success = inbox_mail:copy_messages({{ PRIMARY }}['Gmail Inbox'])

          sent_mail = gmail['[Gmail]/Sent Mail']:select_all()
          sent_copy_success = sent_mail:copy_messages({{ PRIMARY }}['Gmail Sent'])

          spam_mail = gmail["[Gmail]/Spam"]:select_all()
          spam_mail:move_messages({{ PRIMARY }}['Gmail Spam'])

          -- Only clear the All Mail folder if we were successful in moving
          -- our Inbox and Sent mail. Note: move_messages is supposed to return
          -- booleans for copying the messages and then marking them as deleted.
          -- For some reason the mark for deletion return value is 'nil'.
          -- This may need to be [Gmail]/Bin or [Gmail]/Trash check your account!
          if (inbox_copy_success and sent_copy_success) then
              print('Safe to delete both inbox and sent')
              move_inbox = inbox_mail:move_messages(gmail['[Gmail]/Trash'])
              move_sent = sent_mail:move_messages(gmail['[Gmail]/Trash'])

              if (move_inbox and move_sent) then
                  print('Emptying bin');
                  bin_mail = gmail['[Gmail]/Trash']:select_all()
                  bin_mail:delete_messages()
              end
          end
      end

      {%- if SECONDARY != '' %}
      -- {{ SECONDARY }}
      -- Only go ahead and copy inbox/sent/spam from {{ SECONDARY }} if I have received
      -- some Inbox email.
      if ({{ SECONDARY }}['Inbox']:check_status() > 0) then
          inbox_results = {{ SECONDARY }}['Inbox']:select_all()
          inbox_results:move_messages({{ PRIMARY }}['{{ SECONDARY }} Inbox'])

          sent_results = {{ SECONDARY }}['Sent']:select_all()
          sent_results:move_messages({{ PRIMARY }}['{{ SECONDARY }} Sent'])

          spam_results = {{ SECONDARY }}['Junk']:select_all()
          spam_results:move_messages({{ PRIMARY }}['{{ SECONDARY }} Spam'])
      end
      {%- endif %}
  end

  main()