imapfilter config for server with IDLE support

.imapfilterSLASHconfig.lua

if_dir = os.getenv('HOME') .. '/.imapfilter/'

---------------
--  Options  --
---------------

-- time in second before deciding the server timeouted
options.timeout = 120
-- auto-subscribe to new directories
options.subscribe = true
-- verbose mode 
options.info = true
-- use tls
options.starttls = true
-- time before terminating and reissuing the IDLE command, to avoid
-- server reset due to inactivity and so keep the session alive. 
options.keepalive = 29

----------------
--  Accounts  --
----------------

normation  = IMAP {
  server   = 'mail.provider.com'
, username = ‘[email protected]'
, password = 'your password'
}

-- other accounts can be configured here

-- and now, the filtering part!

------------------------
-- Filters: Normation --
------------------------

-- the main loop

repeat

-- only a subset of filters are presented, and a lot of other logic
-- combinators are possible to decide what to do

-- check on “from” contents from the INBOX folder of “normation” account 
-- defined above. contain_{bcc, cc, from, suject, to, field, 
-- body, message} are available. 
-- “field” is any header, neat for mailing list!
-- 
-- syntax is “varname_where_storing_result = filter_action”
    
x = normation.INBOX:contain_from('[email protected]')
    -- action to perform: syntax is “varname_where_storing_result:action”
x:move_messages(normation['products.rudder-project.github-notifications'])

-- “or” between several predicates with “+” 
-- and “&” is used for “and”.
    x = normation.INBOX:contain_subject('[Aful]')
      +   normation.INBOX:contain_to('[email protected]')
      +   normation.INBOX:contain_to('[email protected]')
    x:move_messages(normation['veille, r-et-d, opensource/aful'])

    -- I mainly move emails around, but you can do a whole bunch
    -- of action: create accounts, delete messages, mark seen, etc etc
    -- Check “man imapfilter_config” to discover all the possibilities. 

    x = normation.INBOX:contain_field('x-list-administrivia', 'yes')
-- subfilter are denoted with “.” or “/”
    x:move_messages(normation['mailing-lists.mailman-moderation'])

    -- I only use “x”, because it’s a short, non sensible variable name
    -- and allow nice-looking indentation with “+/&/etc”. It could
    -- lead to strange result if I forget an action, so feel free to 
    -- use new variable name for each filter. 

    -- an example with a named field. In place of “contain_” 
-- you can also “match_” to use regular expressions
    x = normation.INBOX:contain_field('List-Post', '<mailto:[email protected]>')
    x:move_messages(normation['produits/rudder-project/ml-oss-rudder-user'])

    -- an so on, and so on for dozens of similar filters :)

-- end of the loop. With that, imapfilter opens an IDLE connection
-- to the server, allowing to receive emails as soon as they are published. 
until not normation.INBOX:enter_idle()

-- end