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diff --git a/piem-maildir.el b/piem-maildir.el
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+;;; piem-maildir.el --- Maildir helpers for piem     -*- lexical-binding: t; -*-
+
+;; This file is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published
+;; by the Free Software Foundation; either version 2, or (at your
+;; option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; This file extracts parts of Notmuch's emacs/notmuch-maildir-fcc.el
+;; (ed40579ad3882e6f9bbe9b1ba5e707ab289ca203), simply replacing
+;; "notmuch-maildir-fcc-" with "piem-maildir-".  No other
+;; modifications have been made.  The copyright notice above matches
+;; what is in the original file.
+
+;;; Code:
+
+(defvar piem-maildir-count 0)
+
+(defun piem-maildir-host-fixer (hostname)
+  (replace-regexp-in-string "/\\|:"
+                            (lambda (s)
+                              (cond ((string-equal s "/") "\\057")
+                                    ((string-equal s ":") "\\072")
+                                    (t s)))
+                            hostname
+                            t
+                            t))
+
+(defun piem-maildir-make-uniq-maildir-id ()
+   (let* ((ftime (float-time))
+          (microseconds (mod (* 1000000 ftime) 1000000))
+          (hostname (piem-maildir-host-fixer (system-name))))
+     (setq piem-maildir-count (+ piem-maildir-count 1))
+     (format "%d.%d_%d_%d.%s"
+             ftime
+             (emacs-pid)
+             microseconds
+             piem-maildir-count
+             hostname)))
+
+(defun piem-maildir-dir-is-maildir-p (dir)
+  (and (file-exists-p (concat dir "/cur/"))
+       (file-exists-p (concat dir "/new/"))
+       (file-exists-p (concat dir "/tmp/"))))
+
+(defun piem-maildir-move-tmp-to-new (destdir msg-id)
+  (add-name-to-file
+   (concat destdir "/tmp/" msg-id)
+   (concat destdir "/new/" msg-id ":2,")))
+
+(provide 'piem-maildir)
+;;; piem-maildir.el ends here