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emacs: Optionally check for missing attachments in outgoing messages

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Query the user if the message text indicates that an attachment is
expected but no MML referencing an attachment is found.

This is not enabled by default - see the documentation for
`notmuch-mua-attachment-check'.
This commit is contained in:
David Edmondson 2018-09-08 22:40:40 +01:00 committed by David Bremner
parent d25dcc589c
commit 1aae6daef7
1 changed files with 37 additions and 0 deletions
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37
emacs/notmuch-mua.el
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@ -115,8 +115,45 @@ multiple parts get a header."
(function :tag "Other"))
:group 'notmuch-reply)
(defcustom notmuch-mua-attachment-regexp
"\\b\\(attache\?ment\\|attached\\|attach\\|pi[èe]ce\s+jointe?\\)\\b"
"Message body text indicating that an attachment is expected.
This is not used unless `notmuch-mua-attachment-check' is added
to `notmuch-mua-send-hook'.")
;;
(defun notmuch-mua-attachment-check ()
"Signal an error if the message text indicates that an
attachment is expected but no MML referencing an attachment is
found.
Typically this is added to `notmuch-mua-send-hook'."
(when (and
;; When the message mentions attachment...
(save-excursion
(message-goto-body)
(loop while (re-search-forward notmuch-mua-attachment-regexp (point-max) t)
;; For every instance of the "attachment" string
;; found, examine the text properties. If the text
;; has either a `face' or `syntax-table' property
;; then it is quoted text and should *not* cause the
;; user to be asked about a missing attachment.
if (let ((props (text-properties-at (match-beginning 0))))
(not (or (memq 'syntax-table props)
(memq 'face props))))
return t
finally return nil))
;; ...but doesn't have a part with a filename...
(save-excursion
(message-goto-body)
(not (re-search-forward "^<#part [^>]*filename=" nil t)))
;; ...and that's not okay...
(not (y-or-n-p "Attachment mentioned, but no attachment - is that okay?")))
;; ...signal an error.
(error "Missing attachment")))
(defun notmuch-mua-get-switch-function ()
"Get a switch function according to `notmuch-mua-compose-in'."
(cond ((eq notmuch-mua-compose-in 'current-window)