lisp/mh-e/mh-compat.el

   1 ;;; mh-compat.el --- make MH-E compatibile with various versions of Emacs
   2
   3 ;; Copyright (C) 2006 Free Software Foundation, Inc.
   4
   5 ;; Author: Bill Wohler <wohler@newt.com>
   6 ;; Maintainer: Bill Wohler <wohler@newt.com>
   7 ;; Keywords: mail
   8 ;; See: mh-e.el
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Change Log:
  30
  31 ;;; Code:
  32
  33 ;; This is a good place to gather code that is used for compatibility
  34 ;; between different versions of Emacs. Please document which versions
  35 ;; of Emacs that the defsubst, defalias, or defmacro applies. That
  36 ;; way, it's easy to occasionally go through this file and see which
  37 ;; macros we can retire.
  38
  39 ;; See also mh-gnus.el for compatibility macros used to span different
  40 ;; versions of Gnus.
  41
  42 ;; Macros are listed alphabetically.
  43
  44 (unless (fboundp 'assoc-string)
  45   (defsubst assoc-string (key list case-fold)
  46     "Like `assoc' but specifically for strings.
  47 Case is ignored if CASE-FOLD is non-nil.
  48 This function added by MH-E for Emacs versions that lack
  49 `assoc-string', introduced in Emacs 22."
  50     (if case-fold
  51         (assoc-ignore-case key list)
  52       (assoc key list))))
  53
  54 (defmacro mh-display-completion-list (completions &optional common-substring)
  55   "Display the list of COMPLETIONS.
  56 Calls `display-completion-list' correctly in older environments.
  57 Versions of Emacs prior to version 22 lacked a COMMON-SUBSTRING
  58 argument which is used to highlight the next possible character you
  59 can enter in the current list of completions."
  60   (if (< emacs-major-version 22)
  61       `(display-completion-list ,completions)
  62     `(display-completion-list ,completions ,common-substring)))
  63
  64 (provide 'mh-compat)
  65
  66 ;; Local Variables:
  67 ;; no-byte-compile: t
  68 ;; indent-tabs-mode: nil
  69 ;; sentence-end-double-space: nil
  70 ;; End:
  71
  72 ;; arch-tag: 577b0eab-a5cd-45e1-8d9f-c1a426f4d73c
  73 ;;; mh-compat.el ends here