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Add support for bug-reference auto-setup in mu4e-view-mode 

The bug-reference mode in Emacs 28 has support for several kinds of auto-setup,
one of them being for mail customizable by the variable
`bug-reference-setup-from-mail-alist`.  Add mu4e support for that so that users
can simply do

    (add-hook 'mu4e-view-mode-hook #'bug-reference-mode)

and have it working.

Also squash one byte-compiler warning about the (at compile-time) undefined
variable `gnus-article-buffer`.

* mu4e/mu4e-utils.el (mu4e-view--try-setup-bug-reference-mode): New function.
This commit is contained in:
Tassilo Horn 2021-05-28 23:33:08 +02:00
parent cefd66159a
commit b7fb722df6
1 changed files with 33 additions and 0 deletions
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33
mu4e/mu4e-utils.el
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@ -540,6 +540,7 @@ Or go to the top level if there is none."
(with-current-buffer (mu4e-get-headers-buffer)
mu4e~headers-last-query)))
(defvar gnus-article-buffer) ;; Fix byte-compiler warning.
(defun mu4e-get-view-buffer ()
"Get the view buffer, if any."
(get-buffer
@ -1342,6 +1343,38 @@ string will be shortened to fit if its length exceeds
(insert (propertize "Loading message..."
'face 'mu4e-system-face 'intangible t))))
;;
;; Bug Reference mode support
;;
;; This is Emacs 28 stuff but there is no need to guard it with some (f)boundp
;; checks (which would return nil if bug-reference.el is not loaded before
;; mu4e) since the function definition doesn't hurt and `add-hook' works fine
;; for not yet defined variables (by creating them).
(declare-function bug-reference-maybe-setup-from-mail "ext:bug-reference")
(defun mu4e-view--try-setup-bug-reference-mode ()
"Try to guess bug-reference setup from the current mu4e mail.
Looks at the maildir and the mail headers List, List-Id, Maildir,
To, From, Cc, and Subject and tries to guess suitable values for
`bug-reference-bug-regexp' and `bug-reference-url-format' by
matching the maildir name against GROUP-REGEXP and each header
value against HEADER-REGEXP in
`bug-reference-setup-from-mail-alist'."
(when (derived-mode-p 'mu4e-view-mode)
(let (header-values)
(save-excursion
(goto-char (point-min))
(dolist (field '("list" "list-id" "to" "from" "cc" "subject"))
(let ((val (mail-fetch-field field)))
(when val
(push val header-values)))))
(bug-reference-maybe-setup-from-mail
(mail-fetch-field "maildir")
header-values))))
(add-hook 'bug-reference-auto-setup-functions
#'mu4e-view--try-setup-bug-reference-mode)
;;; _
(provide 'mu4e-utils)
;;; mu4e-utils.el ends here