1 ;;; notmuch-compat.el --- compatibility functions for earlier versions of emacs -*- lexical-binding: t -*-
3 ;; The functions in this file are copied from more modern versions of
4 ;; emacs and are Copyright (C) 1985-1986, 1992, 1994-1995, 1999-2017
5 ;; Free Software Foundation, Inc.
7 ;; This file is part of Notmuch.
9 ;; Notmuch is free software: you can redistribute it and/or modify it
10 ;; under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation, either version 3 of the License, or
12 ;; (at your option) any later version.
14 ;; Notmuch is distributed in the hope that it will be useful, but
15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 ;; General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with Notmuch. If not, see <https://www.gnu.org/licenses/>.
24 ;; Before Emacs 26.1 lines that are longer than 998 octets were not.
25 ;; folded. Commit 77bbca8c82f6e553c42abbfafca28f55fc995d00 fixed
26 ;; that. Until we drop support for Emacs 25 we have to backport that
27 ;; fix. To avoid interfering with Gnus we only run the hook when
28 ;; called from notmuch-message-mode.
30 (declare-function mail-header-fold-field "mail-parse" nil)
32 (defun notmuch-message--fold-long-headers ()
33 (when (eq major-mode 'notmuch-message-mode)
34 (goto-char (point-min))
36 (when (and (looking-at "[^:]+:")
37 (> (- (line-end-position) (point)) 998))
38 (mail-header-fold-field))
41 (unless (fboundp 'message--fold-long-headers)
42 (add-hook 'message-header-hook 'notmuch-message--fold-long-headers))
44 ;; `dlet' isn't available until Emacs 28.1. Below is a copy, with the
45 ;; addition of `with-no-warnings'.
46 (defmacro notmuch-dlet (binders &rest body)
47 "Like `let*' but using dynamic scoping."
48 (declare (indent 1) (debug let))
50 (with-no-warnings ; Quiet "lacks a prefix" warning.
51 ,@(mapcar (lambda (binder)
52 `(defvar ,(if (consp binder) (car binder) binder)))
54 (let* ,binders ,@body)))
56 (provide 'notmuch-compat)
58 ;;; notmuch-compat.el ends here