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From: David Bremner <david@tethera.net>
To: Attic Hermit <fjdksl@cock.li>, notmuch@notmuchmail.org
Subject: Re: Is there a prefix that performs from: and to: simultaneously?
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 <874lrvpjay.fsf@gmail.com>
Date: Fri, 22 Sep 2017 08:54:56 -0300
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Attic Hermit <fjdksl@cock.li> writes:

>> +john +friend -- tag:new AND (to:john@example.tld OR
>> from:john@example.tld)
>
> First did I tried that form, but I felt that wasn't up to snuff because
> I still have to write the same address two times.

Currently I think that's the best you can do. You may be interested in
defining a predefined query

notmuch config query.fromtojohn "to:john@example.tld OR from:john@example.tld"

then you can use

+john +friend -- tag:new AND (to:john@example.tld OR from:john@example.tld) query:fromtojohn

Hypothetically it would be possible to extend the query: syntax to
support parameters, but I'm not sure it's worth the extra complexity.