Ah! That's good to know! So here is my final, hopefully fully-functioning version then:
--8<---------------cut here---------------start------------->8---
(defvar ambrevar/known-mailing-list-archives
'(("[email protected]" . "guix")
("[email protected]" . "guix")
("debbugs.gnu.org" . "guix"))
"Alist of mail adresses and their Yhetil name.
Alternatively the key may just be a host name against which a
recipient will be matched.")
(defun ambrevar/guess-yhetil-link (message-id)
(let* ((all-addresses (mapcar #'second
(mail-extract-address-components
(mapconcat #'identity
(list
(notmuch-show-get-header :To)
(notmuch-show-get-header :Cc))
", ")
'all)))
(match-address (lambda (address-or-host)
(if (string-match "@" address-or-host)
(member address-or-host all-addresses)
(seq-find (lambda (address)
(string-match address-or-host address))
all-addresses))))
(mailing-list (alist-get
(seq-find match-address
(mapcar #'car
ambrevar/known-mailing-list-archives))
ambrevar/known-mailing-list-archives
nil nil #'string=)))
(when mailing-list
(concat "https://yhetil.org/";
mailing-list "/" message-id))))
(add-to-list 'notmuch-show-stash-mlarchive-link-alist
(cons "Yhetil" #'ambrevar/guess-yhetil-link))
(setq notmuch-show-stash-mlarchive-link-default "Yhetil")
--8<---------------cut here---------------end--------------->8---
Cheers!
--
Pierre Neidhardt
https://ambrevar.xyz/
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