X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=emacs%2Fnotmuch-compat.el;h=2cedd39d5eb8e98604b4497ea70bf7106ab1a4c2;hp=c3d827af59969f9f7fe5aac04b3c9d8835bf300f;hb=HEAD;hpb=60ac94fe58635f9c40724afa0f35965fc9ff1afc

diff --git a/emacs/notmuch-compat.el b/emacs/notmuch-compat.el
index c3d827af..179bf59c 100644
--- a/emacs/notmuch-compat.el
+++ b/emacs/notmuch-compat.el
@@ -1,73 +1,58 @@
-;; Compatibility functions for emacs 23 and 24 pre 24.4
-
-;; The functions in this file are copied from eamcs 24.4 and are
-;; Copyright (C) 1985-1986, 1992, 1994-1995, 1999-2014 Free Software
-;; Foundation, Inc.
-
-(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
+;;; 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.
+;;
+;; 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)
+
+(defun notmuch-message--fold-long-headers ()
+  (when (eq major-mode 'notmuch-message-mode)
+    (goto-char (point-min))
+    (while (not (eobp))
+      (when (and (looking-at "[^:]+:")
+		 (> (- (line-end-position) (point)) 998))
+	(mail-header-fold-field))
+      (forward-line 1))))
+
+(unless (fboundp 'message--fold-long-headers)
+  (add-hook 'message-header-hook 'notmuch-message--fold-long-headers))
+
+;; `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