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319dcfb50e
notmuch-before-tag-hook and notmuch-after-tag-hook are supposed to
have access to two dynamic variables, tag-changes and query, but these
were lost with the switch to lexical binding in fc4cda07 (emacs: use
lexical-bindings in all libraries, 2021-01-13).
Add a variant of Emacs's dlet (not available until Emacs 28) and use
it in notmuch-tag to expose tag-changes and query to the hooks.
58 lines
2.2 KiB
EmacsLisp
58 lines
2.2 KiB
EmacsLisp
;;; notmuch-compat.el --- compatibility functions for earlier versions of emacs -*- lexical-binding: t -*-
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;;
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;; The functions in this file are copied from more modern versions of
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;; emacs and are Copyright (C) 1985-1986, 1992, 1994-1995, 1999-2017
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;; Free Software Foundation, Inc.
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;;
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;; This file is part of Notmuch.
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;;
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;; Notmuch is free software: you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; Notmuch is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with Notmuch. If not, see <https://www.gnu.org/licenses/>.
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;;; Code:
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;; Before Emacs 26.1 lines that are longer than 998 octets were not.
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;; folded. Commit 77bbca8c82f6e553c42abbfafca28f55fc995d00 fixed
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;; that. Until we drop support for Emacs 25 we have to backport that
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;; fix. To avoid interfering with Gnus we only run the hook when
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;; called from notmuch-message-mode.
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(declare-function mail-header-fold-field "mail-parse" nil)
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(defun notmuch-message--fold-long-headers ()
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(when (eq major-mode 'notmuch-message-mode)
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(goto-char (point-min))
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(while (not (eobp))
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(when (and (looking-at "[^:]+:")
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(> (- (line-end-position) (point)) 998))
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(mail-header-fold-field))
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(forward-line 1))))
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(unless (fboundp 'message--fold-long-headers)
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(add-hook 'message-header-hook 'notmuch-message--fold-long-headers))
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;; `dlet' isn't available until Emacs 28.1. Below is a copy, with the
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;; addition of `with-no-warnings'.
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(defmacro notmuch-dlet (binders &rest body)
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"Like `let*' but using dynamic scoping."
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(declare (indent 1) (debug let))
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`(let (_)
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(with-no-warnings ; Quiet "lacks a prefix" warning.
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,@(mapcar (lambda (binder)
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`(defvar ,(if (consp binder) (car binder) binder)))
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binders))
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(let* ,binders ,@body)))
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(provide 'notmuch-compat)
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;;; notmuch-compat.el ends here
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