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;;; makesum.el --- generate key binding summary for Emacs -*- lexical-binding:t -*-
;; Copyright (C) 1985, 2001-2021 Free Software Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: help
;; 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:
;; Displays a nice human-readable summary of all keybindings in a
;; two-column format.
;;; Code:
;;;###autoload
(defun make-command-summary ()
"Make a summary of current key bindings in the buffer *Summary*.
Previous contents of that buffer are killed first."
(interactive)
(message "Making command summary...")
;; This puts a description of bindings in a buffer called *Help*.
(save-window-excursion
(describe-bindings))
(with-output-to-temp-buffer "*Summary*"
(save-excursion
(let ((cur-mode mode-name))
(set-buffer standard-output)
(erase-buffer)
(insert-buffer-substring "*Help*")
(goto-char (point-min))
(delete-region (point) (progn (forward-line 1) (point)))
(while (search-forward " " nil t)
(replace-match " "))
(goto-char (point-min))
(while (search-forward "-@ " nil t)
(replace-match "-SP"))
(goto-char (point-min))
(while (search-forward " .. ~ " nil t)
(replace-match "SP .. ~"))
(goto-char (point-min))
(while (search-forward "C-?" nil t)
(replace-match "DEL"))
(goto-char (point-min))
(while (search-forward "C-i" nil t)
(replace-match "TAB"))
(goto-char (point-min))
(when (re-search-forward "^Local Bindings:" nil t)
(forward-char -1)
(insert " for " (format-mode-line cur-mode) " Mode")
(while (search-forward "??\n" nil t)
(delete-region (point)
(progn
(forward-line -1)
(point)))))
(goto-char (point-min))
(insert "Emacs command summary, " (substring (current-time-string) 0 10)
".\n")
;; Delete "key binding" and underlining of dashes.
(delete-region (point) (progn (forward-line 2) (point)))
(forward-line 1) ;Skip blank line
(while (not (eobp))
(let ((beg (point)))
(or (re-search-forward "^$" nil t)
(goto-char (point-max)))
(double-column beg (point))
(forward-line 1)))
(goto-char (point-min)))))
(message "Making command summary...done"))
(defun double-column (start end)
"Reformat buffer contents from START to END into two columns."
(interactive "r")
(let (half lines
(nlines (count-lines start end))
(from-end (- (point-max) end)))
(when (> nlines 1)
(setq half (/ (1+ nlines) 2))
(goto-char start)
(save-excursion
(forward-line half)
(dotimes (_ (- nlines half))
(push (buffer-substring (point) (line-end-position))
lines)
(delete-region (point) (progn (forward-line 1) (point)))))
(dolist (line (nreverse lines))
(end-of-line)
(indent-to 41)
(insert line)
(forward-line 1)))
(goto-char (- (point-max) from-end))))
(provide 'makesum)
;;; makesum.el ends here
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