+(defcustom notmuch-fcc-dirs "sent"
+ "Determines the maildir directory in which to save outgoing mail.
+
+Three types of values are permitted:
+
+- nil: no Fcc header is added,
+
+- a string: the value of `notmuch-fcc-dirs' is the name of the
+ folder to use,
+
+- a list: the folder is chosen based on the From address of the
+ current message using a list of regular expressions and
+ corresponding folders:
+
+ ((\"Sebastian@SSpaeth.de\" . \"privat\")
+ (\"spaetz@sspaeth.de\" . \"OUTBOX.OSS\")
+ (\".*\" . \"defaultinbox\"))
+
+ If none of the regular expressions match the From address, no
+ Fcc header will be added.
+
+In all cases, a relative FCC directory will be understood to
+specify a directory within the notmuch mail store, (as set by
+the database.path option in the notmuch configuration file).
+
+You will be prompted to create the directory if it does not exist
+yet when sending a mail."
+
+ :type '(choice
+ (const :tag "No FCC header" nil)
+ (string :tag "A single folder")
+ (repeat :tag "A folder based on the From header"
+ (cons regexp (string :tag "Folder"))))
+ :require 'notmuch-fcc-initialization
+ :group 'notmuch-send)
+
+(defun notmuch-fcc-initialization ()
+ "If notmuch-fcc-directories is set,
+ hook them into the message-fcc-handler-function"
+ ;; Set up the message-fcc-handler to move mails to the maildir in Fcc
+ ;; The parameter is set to mark messages as "seen"
+ (setq message-fcc-handler-function
+ (lambda (destdir)
+ (notmuch-maildir-fcc-write-buffer-to-maildir destdir t)))
+ ;; add a hook to actually insert the Fcc header when sending
+ (add-hook 'message-header-setup-hook 'notmuch-fcc-header-setup))
+
+(defun notmuch-fcc-header-setup ()
+ "Add an Fcc header to the current message buffer.
+
+Can be added to `message-send-hook' and will set the Fcc header
+based on the values of `notmuch-fcc-dirs'. An existing Fcc header
+will NOT be removed or replaced."
+
+ (let ((subdir
+ (cond
+ ((or (not notmuch-fcc-dirs)
+ (message-field-value "Fcc"))
+ ;; Nothing set or an existing header.
+ nil)
+
+ ((stringp notmuch-fcc-dirs)
+ notmuch-fcc-dirs)
+
+ ((and (listp notmuch-fcc-dirs)
+ (stringp (car notmuch-fcc-dirs)))
+ ;; Old style - no longer works.
+ (error "Invalid `notmuch-fcc-dirs' setting (old style)"))
+
+ ((listp notmuch-fcc-dirs)
+ (let* ((from (message-field-value "From"))
+ (match
+ (catch 'first-match
+ (dolist (re-folder notmuch-fcc-dirs)
+ (when (string-match-p (car re-folder) from)
+ (throw 'first-match re-folder))))))
+ (if match
+ (cdr match)
+ (message "No Fcc header added.")
+ nil)))
+
+ (t
+ (error "Invalid `notmuch-fcc-dirs' setting (neither string nor list)")))))
+
+ (when subdir
+ (message-add-header
+ (concat "Fcc: "
+ (file-truename
+ ;; If the resulting directory is not an absolute path,
+ ;; prepend the standard notmuch database path.
+ (if (= (elt subdir 0) ?/)
+ subdir
+ (concat (notmuch-database-path) "/" subdir)))))
+
+ ;; finally test if fcc points to a valid maildir
+ (let ((fcc-header (message-field-value "Fcc")))
+ (unless (notmuch-maildir-fcc-dir-is-maildir-p fcc-header)
+ (cond ((not (file-writable-p fcc-header))
+ (error (format "No permission to create %s, which does not exist"
+ fcc-header)))
+ ((y-or-n-p (format "%s is not a maildir. Create it? "
+ fcc-header))
+ (notmuch-maildir-fcc-create-maildir fcc-header))
+ (t
+ (error "Message not sent"))))))))
+