;;; ehelp.el --- bindings for electric-help mode
-;; Copyright (C) 1986, 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1986, 1995, 2000, 2001, 2002, 2003, 2004,
+;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: help, extensions
;; 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 2, or (at your option)
+;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; 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, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
(defvar electric-help-form-to-execute nil)
+(defgroup electric-help ()
+ "Electric help facility."
+ :version "21.1"
+ :group 'help)
+
+(defcustom electric-help-shrink-window t
+ "If set, adjust help window sizes to buffer sizes when displaying help."
+ :type 'boolean
+ :group 'electric-help)
+
+(defcustom electric-help-mode-hook nil
+ "Hook run by `with-electric-help' after initializing the buffer."
+ :type 'hook
+ :group 'electric-help)
+
(put 'electric-help-undefined 'suppress-keymap t)
(if electric-help-map
()
(define-key map "<" 'beginning-of-buffer)
(define-key map ">" 'end-of-buffer)
;(define-key map "\C-g" 'electric-help-exit)
- (define-key map "q" 'electric-help-exit)
(define-key map "Q" 'electric-help-exit)
+ (define-key map "q" 'electric-help-exit)
;;a better key than this?
- (define-key map "r" 'electric-help-retain)
(define-key map "R" 'electric-help-retain)
+ (define-key map "r" 'electric-help-retain)
(define-key map "\ex" 'electric-help-execute-extended)
(define-key map "\C-x" 'electric-help-ctrl-x-prefix)
;;;###autoload
(defun with-electric-help (thunk &optional buffer noerase minheight)
"Pop up an \"electric\" help buffer.
-The arguments are THUNK &optional BUFFER NOERASE MINHEIGHT.
THUNK is a function of no arguments which is called to initialize the
contents of BUFFER. BUFFER defaults to `*Help*'. BUFFER will be
erased before THUNK is called unless NOERASE is non-nil. THUNK will
After THUNK has been called, this function \"electrically\" pops up a window
in which BUFFER is displayed and allows the user to scroll through that buffer
-in electric-help-mode. The window's height will be at least MINHEIGHT if
+in `electric-help-mode'. The window's height will be at least MINHEIGHT if
this value is non-nil.
If THUNK returns nil, we display BUFFER starting at the top, and
-shrink the window to fit. If THUNK returns non-nil, we don't do those
-things.
+shrink the window to fit if `electric-help-shrink-window' is non-nil.
+If THUNK returns non-nil, we don't do those things.
-When the user exits (with `electric-help-exit', or otherwise) the help
-buffer's window disappears (i.e., we use `save-window-excursion')
-BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
+When the user exits (with `electric-help-exit', or otherwise), the help
+buffer's window disappears (i.e., we use `save-window-excursion'), and
+BUFFER is put into `default-major-mode' (or `fundamental-mode')."
(setq buffer (get-buffer-create (or buffer "*Help*")))
(let ((one (one-window-p t))
(config (current-window-configuration))
(electric-help-form-to-execute nil))
(unwind-protect
(save-excursion
- (if one (goto-char (window-start (selected-window))))
+ (when one
+ (goto-char (window-start (selected-window))))
(let ((pop-up-windows t))
(pop-to-buffer buffer))
(save-excursion
(set-buffer buffer)
- (if (and minheight (< (window-height) minheight))
- (enlarge-window (- minheight (window-height))))
+ (when (and minheight (< (window-height) minheight))
+ (enlarge-window (- minheight (window-height))))
(electric-help-mode)
(setq buffer-read-only nil)
- (or noerase
- (erase-buffer)))
+ (unless noerase
+ (erase-buffer)))
(let ((standard-output buffer))
- (if (not (funcall thunk))
- (progn
- (set-buffer buffer)
- (set-buffer-modified-p nil)
- (goto-char (point-min))
- (if one (shrink-window-if-larger-than-buffer (selected-window))))))
+ (unless (funcall thunk)
+ (set-buffer buffer)
+ (set-buffer-modified-p nil)
+ (goto-char (point-min))
+ (when (and one electric-help-shrink-window)
+ (shrink-window-if-larger-than-buffer))))
(set-buffer buffer)
(run-hooks 'electric-help-mode-hook)
(setq buffer-read-only t)
- (if (eq (car-safe (electric-help-command-loop))
- 'retain)
+ (if (eq (car-safe (electric-help-command-loop)) 'retain)
(setq config (current-window-configuration))
- (setq bury t))
+ (setq bury t))
;; Remove the hook.
- (if (memq 'electric-help-retain mouse-leave-buffer-hook)
- (remove-hook 'mouse-leave-buffer-hook 'electric-help-retain)))
+ (when (memq 'electric-help-retain mouse-leave-buffer-hook)
+ (remove-hook 'mouse-leave-buffer-hook 'electric-help-retain)))
(message "")
(set-buffer buffer)
(setq buffer-read-only nil)
+
+ ;; We should really get a usable *Help* buffer when retaining
+ ;; the electric one with `r'. The problem is that a simple
+ ;; call to help-mode won't cut it; at least RET is bound wrong
+ ;; afterwards. It's also not clear that `help-mode' is always
+ ;; the right thing, maybe we should add an optional parameter.
(condition-case ()
(funcall (or default-major-mode 'fundamental-mode))
(error nil))
+
(set-window-configuration config)
- (if bury
- (progn
- ;;>> Perhaps this shouldn't be done.
- ;; so that when we say "Press space to bury" we mean it
- (replace-buffer-in-windows buffer)
- ;; must do this outside of save-window-excursion
- (bury-buffer buffer)))
+ (when bury
+ ;;>> Perhaps this shouldn't be done,
+ ;; so that when we say "Press space to bury" we mean it
+ (replace-buffer-in-windows buffer)
+ ;; must do this outside of save-window-excursion
+ (bury-buffer buffer))
(eval electric-help-form-to-execute))))
(defun electric-help-command-loop ()
(if (pos-visible-in-window-p (point-max))
(progn (message "%s" (substitute-command-keys "<<< Press Space to bury the help buffer, Press \\[electric-help-retain] to retain it >>>"))
(if (equal (setq unread-command-events (list (read-event)))
- '(?\ ))
+ '(?\s))
(progn (setq unread-command-events nil)
(throw 'exit t)))))
(let (up down both neither
- (standard (and (eq (key-binding " ")
+ (standard (and (eq (key-binding " " nil t)
'scroll-up)
- (eq (key-binding "\^?")
+ (eq (key-binding "\^?" nil t)
'scroll-down)
- (eq (key-binding "q")
+ (eq (key-binding "q" nil t)
'electric-help-exit)
- (eq (key-binding "r")
+ (eq (key-binding "r" nil t)
'electric-help-retain))))
(Electric-command-loop
'exit
(function (lambda ()
- (sit-for 0) ;necessary if last command was end-of-buffer or
- ;beginning-of-buffer - otherwise pos-visible-in-window-p
+ (sit-for 0) ;necessary if last command was end-of-buffer or
+ ;beginning-of-buffer - otherwise pos-visible-in-window-p
;will yield a wrong result.
(let ((min (pos-visible-in-window-p (point-min)))
- (max (pos-visible-in-window-p (point-max))))
+ (max (pos-visible-in-window-p (1- (point-max)))))
(cond (isearch-mode 'noprompt)
((and min max)
(cond (standard "Press q to exit, r to retain ")
; (scroll-up arg)))
(defun electric-help-exit ()
- "Exit `electric-help', restoring the previous window/buffer configuration.
+ "Exit `with-electric-help', restoring the previous window/buffer configuration.
\(The *Help* buffer will be buried.)"
(interactive)
;; Make sure that we don't throw twice, even if two events cause
(throw 'exit t))))
(defun electric-help-retain ()
- "Exit `electric-help', retaining the current window/buffer configuration.
+ "Exit `with-electric-help', retaining the current window/buffer configuration.
\(The *Help* buffer will not be selected, but \\[switch-to-buffer-other-window] RET
will select it.)"
(interactive)
(interactive)
(error "%s is undefined -- Press %s to exit"
(mapconcat 'single-key-description (this-command-keys) " ")
- (if (eq (key-binding "q") 'electric-help-exit)
+ (if (eq (key-binding "q" nil t) 'electric-help-exit)
"q"
(substitute-command-keys "\\[electric-help-exit]"))))
;>>> this needs to be hairified (recursive help, anybody?)
(defun electric-help-help ()
(interactive)
- (if (and (eq (key-binding "q") 'electric-help-exit)
- (eq (key-binding " ") 'scroll-up)
- (eq (key-binding "\^?") 'scroll-down)
- (eq (key-binding "r") 'electric-help-retain))
+ (if (and (eq (key-binding "q" nil t) 'electric-help-exit)
+ (eq (key-binding " " nil t) 'scroll-up)
+ (eq (key-binding "\^?" nil t) 'scroll-down)
+ (eq (key-binding "r" nil t) 'electric-help-retain))
(message "SPC scrolls up, DEL scrolls down, q exits burying help buffer, r exits")
(message "%s" (substitute-command-keys "\\[scroll-up] scrolls up, \\[scroll-down] scrolls down, \\[electric-help-exit] exits burying help buffer, \\[electric-help-retain] exits")))
(sit-for 2))
\f
-;; This is to be bound to M-x in ehelp mode. Retains ehelp buffer and then
+;; This is to be bound to M-x in ehelp mode. Retains ehelp buffer and then
;; continues with execute-extended-command.
(defun electric-help-execute-extended (prefixarg)
(interactive "p")
(defvar ehelp-map ())
(if ehelp-map
nil
- (let ((map (copy-keymap help-map)))
+ (let ((map (copy-keymap help-map)))
(substitute-key-definition 'apropos 'electric-apropos map)
(substitute-key-definition 'command-apropos 'electric-command-apropos map)
(substitute-key-definition 'describe-key 'electric-describe-key map)
(substitute-key-definition 'describe-bindings 'electric-describe-bindings map)
(substitute-key-definition 'describe-syntax 'electric-describe-syntax map)
- (setq ehelp-map map)
- (fset 'ehelp-command map)))
+ (setq ehelp-map map)))
+
+;;;###(autoload 'ehelp-command "ehelp" "Prefix command for ehelp." t 'keymap)
+(defalias 'ehelp-command ehelp-map)
+(put 'ehelp-command 'documentation "Prefix command for ehelp.")
-(provide 'ehelp)
+(provide 'ehelp)
+;;; arch-tag: e0e3037f-42c0-433e-ba18-322c5d951f46
;;; ehelp.el ends here