-;;; notmuch-compat.el --- compatibility functions for earlier versions of emacs
+;;; notmuch-compat.el --- compatibility functions for earlier versions of emacs -*- lexical-binding: t -*-
;;
;; The functions in this file are copied from more modern versions of
;; emacs and are Copyright (C) 1985-1986, 1992, 1994-1995, 1999-2017
;;; Code:
-;; emacs master has a bugfix for folding long headers when sending
-;; messages. Include the fix for earlier versions of emacs. To avoid
-;; interfering with gnus we only run the hook when called from
-;; notmuch-message-mode.
+;; Before Emacs 26.1 lines that are longer than 998 octets were not.
+;; folded. Commit 77bbca8c82f6e553c42abbfafca28f55fc995d00 fixed
+;; that. Until we drop support for Emacs 25 we have to backport that
+;; fix. To avoid interfering with Gnus we only run the hook when
+;; called from notmuch-message-mode.
(declare-function mail-header-fold-field "mail-parse" nil)
(unless (fboundp 'message--fold-long-headers)
(add-hook 'message-header-hook 'notmuch-message--fold-long-headers))
-;; End of compatibility functions
+;; `dlet' isn't available until Emacs 28.1. Below is a copy, with the
+;; addition of `with-no-warnings'.
+(defmacro notmuch-dlet (binders &rest body)
+ "Like `let*' but using dynamic scoping."
+ (declare (indent 1) (debug let))
+ `(let (_)
+ (with-no-warnings ; Quiet "lacks a prefix" warning.
+ ,@(mapcar (lambda (binder)
+ `(defvar ,(if (consp binder) (car binder) binder)))
+ binders))
+ (let* ,binders ,@body)))
(provide 'notmuch-compat)