;;; ehelp.el --- bindings for electric-help mode
-;; Copyright (C) 1986, 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1986, 1995, 2000, 2001 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: help, extensions
(defvar electric-help-map ()
"Keymap defining commands available in `electric-help-mode'.")
+(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
()
(setq major-mode 'help)
(setq mode-line-buffer-identification '(" Help: %b"))
(use-local-map electric-help-map)
- (setq mouse-leave-buffer-hook '(electric-help-retain))
+ (add-hook 'mouse-leave-buffer-hook 'electric-help-retain)
+ (view-mode -1)
;; this is done below in with-electric-help
;(run-hooks 'electric-help-mode-hook)
)
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')
+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') when we exit."
(setq buffer (get-buffer-create (or buffer "*Help*")))
(let ((one (one-window-p t))
(config (current-window-configuration))
(bury nil)
- (to-be-executed nil))
+ (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)
- (or noerase (erase-buffer)))
+ (setq buffer-read-only nil)
+ (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)
- (if (eq (car-safe (electric-help-command-loop))
- 'retain)
+ (setq buffer-read-only t)
+ (if (eq (car-safe (electric-help-command-loop)) 'retain)
(setq config (current-window-configuration))
- (setq bury t)))
+ (setq bury t))
+ ;; Remove the hook.
+ (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)))
- (eval to-be-executed))))
+ (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 ()
(catch 'exit
(if (pos-visible-in-window-p (point-max))
- (progn (message (substitute-command-keys "<<< Press Space to bury the help buffer, Press \\[electric-help-retain] to retain it >>>"))
+ (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)))
'(?\ ))
(progn (setq unread-command-events nil)
(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))))
; (scroll-up arg)))
(defun electric-help-exit ()
- ">>>Doc"
+ "Exit `electric-help', restoring the previous window/buffer configuration.
+\(The *Help* buffer will be buried.)"
(interactive)
- (throw 'exit t))
+ ;; Make sure that we don't throw twice, even if two events cause
+ ;; calling this function:
+ (if (memq 'electric-help-retain mouse-leave-buffer-hook)
+ (progn
+ (remove-hook 'mouse-leave-buffer-hook 'electric-help-retain)
+ (throw 'exit t))))
(defun electric-help-retain ()
"Exit `electric-help', retaining the current window/buffer configuration.
(interactive)
;; Make sure that we don't throw twice, even if two events cause
;; calling this function:
- (if mouse-leave-buffer-hook
- (progn
- (setq mouse-leave-buffer-hook nil)
- (throw 'exit '(retain)))))
+ (if (memq 'electric-help-retain mouse-leave-buffer-hook)
+ (progn
+ (remove-hook 'mouse-leave-buffer-hook 'electric-help-retain)
+ (throw 'exit '(retain)))))
(defun electric-help-undefined ()
\f
;;;###autoload
-(defun electric-helpify (fun)
- (let ((name "*Help*"))
+(defun electric-helpify (fun &optional name)
+ (let ((name (or name "*Help*")))
(if (save-window-excursion
;; kludge-o-rama
(let* ((p (symbol-function 'print-help-return-message))
\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")
- (setq to-be-executed '(execute-extended-command nil))
+ (setq electric-help-form-to-execute '(execute-extended-command nil))
(electric-help-retain))
;; This is to be buond to C-x in ehelp mode. Retains ehelp buffer and then
;; continues with ctrl-x prefix.
(defun electric-help-ctrl-x-prefix (prefixarg)
(interactive "p")
- (setq to-be-executed '(progn (message nil) (setq unread-command-char ?\C-x)))
+ (setq electric-help-form-to-execute '(progn (message nil) (setq unread-command-char ?\C-x)))
(electric-help-retain))
\f
(defun electric-command-apropos ()
(interactive)
- (electric-helpify 'command-apropos))
+ (electric-helpify 'command-apropos "*Apropos*"))
;(define-key help-map "a" 'electric-command-apropos)
(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
HCoop / bpt / emacs.git / blobdiff