Re: [Extra] Comments on draft-ietf-extra-sieve-special-use-03
Stephan Bosch <stephan.bosch@dovecot.fi> Thu, 01 November 2018 19:01 UTC
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To: Ned Freed <ned.freed@mrochek.com>, Alexey Melnikov <alexey.melnikov@isode.com>
Cc: extra@ietf.org
References: <a519d410-babd-36ee-8343-6fe3bea3a414@isode.com> <d9522e99-5078-01d5-3645-c3b7c8b36ba3@dovecot.fi> <6b72363d-6f00-3ef7-2398-05690926b6f5@isode.com> <01QZ257P6DGE00008A@mauve.mrochek.com>
From: Stephan Bosch <stephan.bosch@dovecot.fi>
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Date: Thu, 01 Nov 2018 20:01:12 +0100
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Subject: Re: [Extra] Comments on draft-ietf-extra-sieve-special-use-03
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Hi Ned, BTW, can you review the IMAP examples in this specification? Regards, Stephan. Op 31/10/2018 om 00:11 schreef Ned Freed: >> Hi Stephan, >> On 29/10/2018 12:06, Stephan Bosch wrote: >>> Hi Alexey, >>> >>> >>> Op 28-10-2018 om 16:07 schreef Alexey Melnikov: >>>> Hi all, >>>> I've just tried to implement this Sieve extension and I have a couple of >>>> comments: >>>> >>>> 3. Test "specialuse_exists" >>>> >>>> Usage: specialuse_exists [<mailbox: string>] >>>> <special-use-flags: string-list> >>>> >>>> This defines an optional argument. According to the base Sieve RFC 5228, >>>> optional arguments must be tagged: >>>> >>>> 2.6.1. Positional Arguments >>>> >>>> Positional arguments are given to a command that discerns their >>>> meaning based on their order. When a command takes positional >>>> arguments, all positional arguments must be supplied and must be in >>>> the order prescribed. >>>> >>>> and >>>> >>>> 2.6.3. Optional Arguments >>>> >>>> Optional arguments are exactly like tagged arguments except that they >>>> may be left out, in which case a default value is implied. Because >>>> optional arguments tend to result in shorter scripts, they have been >>>> used far more than tagged arguments. >>>> >>>> So I don't think you can have "mailbox" being positional without a tag! >>> Then what about the entirety of the "imap4flags" extension? >> Guilty as charged :-). I entirely forgot about that and the reason why I >> haven't noticed is because my implementation doesn't support "variables" >> extension, so variable name parameter to addflag/removeflag/setflag is >> never allowed. >> Any other opinions (Ned?). I just want to make sure that if we violating >> some kind of architectural principle specified in the base Sieve script, >> than we decide to do this deliberately. (Or maybe we just agree that >> there is no architectural principle to begin with.) > There was some principle in play, I think - Sieve copies this aspect from > Common LISP, and if memory serves, &optional in Common LISP makes all > subsequent parameter optional, so you can do something like: > > (defun fu (a b &optional c d) ... > > but there is nothing like: > > (defun bar (a (&optional b) c) ... > > But it looks like we've already crossed this bridge with imap4flags, and > nobody has complained. So let's note it and move on. > >>> Lots of >>> tag-less optional arguments can be found there. I am not against having >>> some ":mailbox" tag here, but the current syntax does make things more >>> concise. >>> >>>> 4. ":specialuse" Argument to "fileinto" Command >>>> >>>> Usage: fileinto [:specialuse <special-use-flag: string>] >>>> <mailbox: string> >>>> >>>> Can I suggest that all special-use-flag strings should not include the >>>> leading "\" character? It requires escaping in Sieve, so people might >>>> make mistakes when writing scripts. >>> I have no strong opinion about that. Disadvantage of doing that is that >>> it can be confusing for people with IMAP experience and it becomes >>> inconsistent with imap4flags. >> Yes, that is true. At the same time in JMAP we can do remove leading "\" >> character from flag names as well. >> So yes, I am not fully decided on this issue. Anybody else wants to comment? > I'm not fond of having multiple forms for things, so I'd prefer to keep > the "\". It's not a strong preference, however. > > Ned > > _______________________________________________ > Extra mailing list > Extra@ietf.org > https://www.ietf.org/mailman/listinfo/extra
- [Extra] Comments on draft-ietf-extra-sieve-specia… Alexey Melnikov
- Re: [Extra] Comments on draft-ietf-extra-sieve-sp… Stephan Bosch
- Re: [Extra] Comments on draft-ietf-extra-sieve-sp… Alexey Melnikov
- Re: [Extra] Comments on draft-ietf-extra-sieve-sp… Ned Freed
- Re: [Extra] Comments on draft-ietf-extra-sieve-sp… Stephan Bosch
- Re: [Extra] Comments on draft-ietf-extra-sieve-sp… Ned Freed