-;; 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
;; Free Software Foundation, Inc.
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; 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.
+;;
+;; This file is part of Notmuch.
+;;
+;; Notmuch 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 3 of the License, or
+;; (at your option) any later version.
+;;
+;; Notmuch 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 Notmuch. If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+;; 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))
-(if (fboundp 'setq-local)
- (defalias 'notmuch-setq-local 'setq-local)
- (defmacro notmuch-setq-local (var val)
- "Set variable VAR to value VAL in current buffer.
-
-Backport of setq-local for emacs without setq-local (pre 24.3)."
- `(set (make-local-variable ',var) ,val)))
-
-(if (fboundp 'read-char-choice)
- (defalias 'notmuch-read-char-choice 'read-char-choice)
- (defun notmuch-read-char-choice (prompt chars &optional inhibit-keyboard-quit)
- "Read and return one of CHARS, prompting for PROMPT.
-Any input that is not one of CHARS is ignored.
-
-If optional argument INHIBIT-KEYBOARD-QUIT is non-nil, ignore
-keyboard-quit events while waiting for a valid input.
-
-This is an exact copy of this function from emacs 24 for use on
-emacs 23, except with the one emacs 24 only function it calls
-inlined."
- (unless (consp chars)
- (error "Called `read-char-choice' without valid char choices"))
- (let (char done show-help (helpbuf " *Char Help*"))
- (let ((cursor-in-echo-area t)
- (executing-kbd-macro executing-kbd-macro)
- (esc-flag nil))
- (save-window-excursion ; in case we call help-form-show
- (while (not done)
- (unless (get-text-property 0 'face prompt)
- (setq prompt (propertize prompt 'face 'minibuffer-prompt)))
- (setq char (let ((inhibit-quit inhibit-keyboard-quit))
- (read-key prompt)))
- (and show-help (buffer-live-p (get-buffer helpbuf))
- (kill-buffer helpbuf))
- (cond
- ((not (numberp char)))
- ;; If caller has set help-form, that's enough.
- ;; They don't explicitly have to add help-char to chars.
- ((and help-form
- (eq char help-char)
- (setq show-help t)
- ;; This is an inlined copy of help-form-show as that
- ;; was introduced in emacs 24 too.
- (let ((msg (eval help-form)))
- (if (stringp msg)
- (with-output-to-temp-buffer " *Char Help*"
- (princ msg))))))
- ((memq char chars)
- (setq done t))
- ((and executing-kbd-macro (= char -1))
- ;; read-event returns -1 if we are in a kbd macro and
- ;; there are no more events in the macro. Attempt to
- ;; get an event interactively.
- (setq executing-kbd-macro nil))
- ((not inhibit-keyboard-quit)
- (cond
- ((and (null esc-flag) (eq char ?\e))
- (setq esc-flag t))
- ((memq char '(?\C-g ?\e))
- (keyboard-quit))))))))
- ;; Display the question with the answer. But without cursor-in-echo-area.
- (message "%s%s" prompt (char-to-string char))
- char)))
-
-;; 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)
+
+;;; notmuch-compat.el ends here
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