Function: describe-buffer-case-table

describe-buffer-case-table is an interactive and byte-compiled function defined in case-table.el.gz.

Signature

(describe-buffer-case-table)

Documentation

Describe the case table of the current buffer.

View in manual

Key Bindings

Source Code

;; Defined in /usr/src/emacs/lisp/case-table.el.gz
;;; case-table.el --- code to extend the character set and support case tables  -*- lexical-binding: t -*-

;; Copyright (C) 1988, 1994, 2001-2025 Free Software Foundation, Inc.

;; Author: Howard Gayle
;; Maintainer: emacs-devel@gnu.org
;; Keywords: i18n
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Written by:
;; TN/ETX/TX/UMG Howard Gayle        UUCP : seismo!enea!erix!howard
;; Telefonaktiebolaget L M Ericsson  Phone: +46 8 719 55 65
;; Ericsson Telecom                  Telex: 14910 ERIC S
;; S-126 25 Stockholm                FAX  : +46 8 719 64 82
;; Sweden

;;; Code:

(defun describe-buffer-case-table ()
  "Describe the case table of the current buffer."
  (interactive)
  (let ((description (make-char-table 'case-table)))
    (map-char-table
     (lambda (key value)
       (if (not (natnump value))
           (if (consp key)
               (set-char-table-range description key "case-invariant")
             (aset description key "case-invariant"))
         (let (from to)
           (if (consp key)
               (setq from (car key) to (cdr key))
             (setq from (setq to key)))
           (while (<= from to)
             (aset
              description from
              (cond ((/= from (downcase from))
                     (concat "uppercase, matches "
                             (char-to-string (downcase from))))
                    ((/= from (upcase from))
                     (concat "lowercase, matches "
                             (char-to-string (upcase from))))
                    (t "case-invariant")))
             (setq from (1+ from))))))
     (current-case-table))
    (save-excursion
     (with-output-to-temp-buffer "*Help*"
       (set-buffer standard-output)
       (describe-vector description)
       (help-mode)))))