;;; help-macro.el --- Makes command line help such as help-for-help
-;; Copyright (C) 1993 Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
;; Author: Lynn Slater <lrs@indetech.com>
;; Created: : Mon Oct 1 11:42:39 1990
;; Adapted-By: ESR
-;; Last Modified By: Lynn Slater x2048
-;; Last Modified On: Mon Sep 23 14:40:19 1991
;; This file is part of GNU Emacs.
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; Commentary:
-;;
-;; This file supplies the macro make-help-screen which constructs
+
+;; This file supplies the macro make-help-screen which constructs
;; single character dispatching with browsable help such as that provided
;; by help-for-help. This can be used to make many modes easier to use; for
;; example, the Gnu Emacs Empire Tool uses this for every "nested" mode map
(provide 'help-macro)
(require 'backquote)
+;;;###autoload
+(defvar three-step-help nil
+ "*Non-nil means give more info about Help command in three steps.
+The three steps are simple prompt, prompt with all options,
+and window listing and describing the options.
+A value of nil means skip the middle step, so that
+\\[help-command] \\[help-command] gives the window that lists the options.")
+
(defmacro make-help-screen (fname help-line help-text helped-map)
"Construct help-menu function name FNAME.
When invoked, FNAME shows HELP-LINE and reads a command using HELPED-MAP.
-If the command is the help character is requested, FNAME displays HELP-TEXT
+If the command is the help character, FNAME displays HELP-TEXT
and continues trying to read a command using HELPED-MAP.
When FNAME finally does get a command, it executes that command
and then returns."
(interactive)
(let ((line-prompt
(substitute-command-keys (, help-line))))
- (message line-prompt)
- (let* ((overriding-local-map (make-sparse-keymap))
+ (if three-step-help
+ (message line-prompt))
+ (let* ((help-screen (documentation (quote (, fname))))
+ ;; We bind overriding-local-map for very small
+ ;; sections, *excluding* where we switch buffers
+ ;; and where we execute the chosen help command.
+ (local-map (make-sparse-keymap))
(minor-mode-map-alist nil)
- config key char help-screen)
+ (prev-frame (selected-frame))
+ config new-frame key char)
(unwind-protect
(progn
- (setcdr overriding-local-map (, helped-map))
- (define-key overriding-local-map [t] 'undefined)
- (setq help-screen (documentation (quote (, fname))))
- (setq key (read-key-sequence nil))
- (setq char (aref key 0))
- (if (or (eq char ??) (eq char help-char))
+ (setcdr local-map (, helped-map))
+ (define-key local-map [t] 'undefined)
+ (if three-step-help
+ (progn
+ (setq key (let ((overriding-local-map local-map))
+ (read-key-sequence nil)))
+ ;; Make the HELP key translate to C-h.
+ (if (lookup-key function-key-map key)
+ (setq key (lookup-key function-key-map key)))
+ (setq char (aref key 0)))
+ (setq char ??))
+ (if (or (eq char ??) (eq char help-char)
+ (memq char help-event-list))
(progn
(setq config (current-window-configuration))
(switch-to-buffer-other-window "*Help*")
+ (and (fboundp 'make-frame)
+ (not (eq (window-frame (selected-window))
+ prev-frame))
+ (setq new-frame (window-frame (selected-window))
+ config nil))
(erase-buffer)
(insert help-screen)
+ (help-mode)
(goto-char (point-min))
- (while (or (memq char (cons help-char '(?? ?\C-v ?\ ?\177 ?\M-v)))
+ (while (or (memq char (append help-event-list
+ (cons help-char '(?? ?\C-v ?\ ?\177 delete backspace ?\M-v))))
+ (eq (car-safe char) 'switch-frame)
(equal key "\M-v"))
- (setq list (cons key list))
(condition-case nil
(progn
+ (if (eq (car-safe char) 'switch-frame)
+ (handle-switch-frame char))
(if (memq char '(?\C-v ?\ ))
(scroll-up))
- (if (or (memq char '(?\177 ?\M-v))
+ (if (or (memq char '(?\177 ?\M-v
+ delete backspace))
(equal key "\M-v"))
(scroll-down)))
(error nil))
- (message "%s%s: "
- line-prompt
- (if (pos-visible-in-window-p (point-max))
- "" " or Space to scroll"))
- (let ((cursor-in-echo-area t))
- (setq key (read-key-sequence nil)
- char (aref key 0))))
- (setq list (cons key list))))
+ (let ((cursor-in-echo-area t)
+ (overriding-local-map local-map))
+ (setq key (read-key-sequence
+ (format "Type one of the options listed%s: "
+ (if (pos-visible-in-window-p
+ (point-max))
+ "" " or Space to scroll")))
+ char (aref key 0))))))
;; Mouse clicks are not part of the help feature,
;; so reexecute them in the standard environment.
(if (listp char)
(setq unread-command-events
(cons char unread-command-events)
config nil)
- (let ((defn (key-binding key)))
+ (let ((defn (lookup-key local-map key)))
(if defn
(progn
(if config
(progn
(set-window-configuration config)
(setq config nil)))
- (setq overriding-local-map nil)
+ (if new-frame
+ (progn (iconify-frame new-frame)
+ (setq new-frame nil)))
(call-interactively defn))
(ding)))))
+ (if new-frame (iconify-frame new-frame))
(if config
(set-window-configuration config))))))
))
HCoop / bpt / emacs.git / blobdiff