[mu4e rfe] Public-API functions for moving and copying messages

[dcolascione]

Is your feature request related to a problem? Please describe.

I want to make a custom mark for marking messages as spam. In my setup, I mark a message as spam by moving it to a special IMAP folder. Mu4e has no built-in way of moving a message to a specific filter: I can only move to a folder about which I'm asked every time, and I want a command to move to a specific folder, the spam training one.

I have something working, but it relies on the internal function mu4e--server-move:

(defun dancol-mu4e-get-junk-folder (msg &optional print)
  (interactive (list (mu4e-message-at-point) t))
  (let* ((maildir (mu4e-message-field msg :maildir))
         (folder (cond
                   ((string-match "^/XXX/" maildir)
                    "/XXX/spam")
                   ((string-match "^/YYY/" maildir)
                    "/YYY/Junk Email")
                   (t (error "unknown spam folder for maildir %S"
                             maildir)))))
    (when print
      (message "maildir=%S spam=%S" maildir folder))
    folder))

(add-to-list 'mu4e-marks
             '(spam
               :char "s"
               :prompt "spam"
               :dyn-target (lambda (target msg)
                             (dancol-mu4e-get-junk-folder msg))
               :action (lambda (docid msg target)
                         (mu4e--server-move docid target "+S-u-N"))))

(mu4e~headers-defun-mark-for spam)
(define-key mu4e-headers-mode-map (kbd "`") 'mu4e-headers-mark-for-spam)

(mu4e--view-defun-mark-for spam)
(define-key mu4e-view-mode-map (kbd "`") 'mu4e-view-mark-for-spam)

I'd like to use a public API function instead.

Describe the solution you'd like

There should be a public API version of mu4e--server-move. Accepting flags symbolically might be nice too.

It'd also be nice, while we're at it, to make a public API function for copying a message.

[sebeaumont]

Can this be done even with the mu-guile api? I have exactly the same use case.

[djcb]

Not in current mu-guile, currently, the easiest way is to use the mu move command-line tool