* mu4e: offer to create target dirs when they do not exist yet

mu4e/mu4e-mark.el

@@ -237,6 +237,8 @@ replace them with a _real_ mark (ask the user which one)."
 		(mu4e-mark-set (car markpair) (cdr markpair)))))))
       mu4e~mark-map)))
 
+ 
+
 (defun mu4e-mark-execute-all (&optional no-confirmation)
   "Execute the actions for all marked messages in this
 buffer. After the actions have been executed succesfully, the
@@ -260,7 +262,11 @@ If NO-CONFIRMATION is non-nil, don't ask user for confirmation."
 		  marknum (if (> marknum 1) "s" ""))))
 	(maphash
 	  (lambda (docid val)
-	    (let ((mark (car val)) (target (cdr val)))
+	    (let* ((mark (car val)) (target (cdr val))
+		    (fulltarget (concat mu4e-maildir target)))
+	      ;; check if the target exists; if not, offer to create it
+	      (unless (mu4e-create-maildir-maybe fulltarget)
+		(mu4e-error "Target dir %s does not exist" fulltarget))
 	      ;; note: whenever you do something with the message,
 	      ;; it looses its N (new) flag
 	      (case mark

mu4e/mu4e-proc.el

@@ -361,6 +361,8 @@ or (:error ) sexp, which are handled my `mu4e-update-func' and
 `mu4e-error-func', respectively."
   (unless (or maildir flags)
     (mu4e-error "At least one of maildir and flags must be specified"))
+  (unless (or (not maildir) (file-exists-p (concat mu4e-maildir "/" maildir "/")))
+    (mu4e-error "Target dir does not exist"))
   (let* ((idparam (mu4e--docid-msgid-param docid-or-msgid))
 	  (flagstr
 	    (when flags

mu4e/mu4e-utils.el

@@ -127,8 +127,9 @@ see its docstring)."
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 (defun mu4e-create-maildir-maybe (dir)
-  "Offer to create DIR if it does not exist yet. Return t if the
-dir already existed, or has been created, nil otherwise."
+  "Offer to create maildir DIR (full filesystem path) if it does
+not exist yet. Return t if the dir already existed, or has been
+created, nil otherwise."
   (if (and (file-exists-p dir) (not (file-directory-p dir)))
     (mu4e-error "%s exists, but is not a directory." dir))
   (cond