Sync Keywords from Maildir to IMAP Server by comparing timstamps

sync_keywords.rb

require 'date'
require 'net/imap'

dictionary = {
 'a' => 'Junk',
 'b' => 'NonJunk',
 'c' => '$label5',
 'd' => '$label2',
 'e' => '$label3',
 'f' => '$label1',
 'g' => '$label4',
 'h' => '$Forwarded',
 'i' => 'done',
}

mails = {}
Dir["/xxx/Maildir/cur/*"].each do |file|
  unixtime = File.basename(file).split('.')[0]
  flags = []
  File.basename(file).split(',')[-1].split('').each do |char|
    flags << dictionary[char] if dictionary.has_key? char
  end 
  mails[unixtime] = flags
end
  
imap = Net::IMAP.new('xxx')
imap.starttls
imap.login('xxx', 'xxx')
imap.select('INBOX')
imap.search(["ALL"]).reverse_each do |message_id|
  date = imap.fetch(message_id, "INTERNALDATE")[0].attr["INTERNALDATE"]
  unixtime = DateTime.strptime(date, "%d-%b-%Y %H:%M:%S %z").strftime('%s')
  flag_before = imap.fetch(message_id,"FLAGS")[0].attr["FLAGS"]

  # skip non imported mails
  next unless flag_before.include?'maildir-import' 

  # next if timestamp not found
  next unless mails.keys.include? unixtime

  
  # labels to write
  flags=mails[unixtime]
  next unless flags.length > 0
  p flags
  p imap.store(message_id, "+FLAGS", flags)
end