* q doesn't always quit *Help*
@ 2007-09-26 18:54 Drew Adams
2007-09-27 9:05 ` martin rudalics
0 siblings, 1 reply; 9+ messages in thread
From: Drew Adams @ 2007-09-26 18:54 UTC (permalink / raw)
To: Bug-Gnu-Emacs
There are plenty of contexts where `q' in *Help* does not quit. I and
others have reported some in the past. Here is another:
emacs -Q
C-h f forward-char
C-x 0 ; so *Help* is the only window
q ; Does nothing.
In general, View-mode quitting is a complex mess.
In GNU Emacs 22.1.1 (i386-mingw-nt5.1.2600)
of 2007-06-02 on RELEASE
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -Ic:/gnuwin32/include'
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: q doesn't always quit *Help*
2007-09-26 18:54 Drew Adams
@ 2007-09-27 9:05 ` martin rudalics
0 siblings, 0 replies; 9+ messages in thread
From: martin rudalics @ 2007-09-27 9:05 UTC (permalink / raw)
To: Drew Adams; +Cc: Bug-Gnu-Emacs
[-- Attachment #1: Type: text/plain, Size: 604 bytes --]
> There are plenty of contexts where `q' in *Help* does not quit. I and
> others have reported some in the past. Here is another:
>
> emacs -Q
>
> C-h f forward-char
>
> C-x 0 ; so *Help* is the only window
>
> q ; Does nothing.
>
>
> In general, View-mode quitting is a complex mess.
I'm working on this. You could help me by checking the attached patch.
It's against Emacs 22.1 and incorporates a couple of changes (help-xref,
find-source-lisp-file, and changes to faces.el) by other people.
There's also a new customizable variable called `help-window-select' ...
Suggestions welcome!
[-- Attachment #2: help-view.patch --]
[-- Type: text/plain, Size: 57823 bytes --]
*** descr-text.el Wed Jul 25 06:47:32 2007
--- descr-text.el Thu Sep 27 08:44:20 2007
***************
*** 588,594 ****
(if (cadr x) (length (car x)) 0))
item-list)))
(help-setup-xref nil (interactive-p))
! (with-output-to-temp-buffer (help-buffer)
(with-current-buffer standard-output
(set-buffer-multibyte multibyte-p)
(let ((formatter (format "%%%ds:" max-width)))
--- 588,594 ----
(if (cadr x) (length (car x)) 0))
item-list)))
(help-setup-xref nil (interactive-p))
! (with-help-window (help-buffer)
(with-current-buffer standard-output
(set-buffer-multibyte multibyte-p)
(let ((formatter (format "%%%ds:" max-width)))
***************
*** 685,692 ****
(if text-props-desc (insert text-props-desc))
(setq help-xref-stack-item (list 'help-insert-string (buffer-string)))
! (toggle-read-only 1)
! (print-help-return-message)))))
(defalias 'describe-char-after 'describe-char)
(make-obsolete 'describe-char-after 'describe-char "22.1")
--- 685,691 ----
(if text-props-desc (insert text-props-desc))
(setq help-xref-stack-item (list 'help-insert-string (buffer-string)))
! (toggle-read-only 1)))))
(defalias 'describe-char-after 'describe-char)
(make-obsolete 'describe-char-after 'describe-char "22.1")
*** disp-table.el Wed Jul 25 06:47:30 2007
--- disp-table.el Thu Sep 27 08:45:10 2007
***************
*** 75,81 ****
;;;###autoload
(defun describe-display-table (dt)
"Describe the display table DT in a help buffer."
! (with-output-to-temp-buffer "*Help*"
(princ "\nTruncation glyph: ")
(prin1 (display-table-slot dt 'truncation))
(princ "\nWrap glyph: ")
--- 75,81 ----
;;;###autoload
(defun describe-display-table (dt)
"Describe the display table DT in a help buffer."
! (with-help-window "*Help*"
(princ "\nTruncation glyph: ")
(prin1 (display-table-slot dt 'truncation))
(princ "\nWrap glyph: ")
***************
*** 97,104 ****
(aset vector i (aref dt i))
(setq i (1+ i)))
(describe-vector vector))
! (help-mode))
! (print-help-return-message)))
;;;###autoload
(defun describe-current-display-table ()
--- 97,103 ----
(aset vector i (aref dt i))
(setq i (1+ i)))
(describe-vector vector))
! (help-mode))))
;;;###autoload
(defun describe-current-display-table ()
***************
*** 220,226 ****
variable, or else customize `enable-multibyte-characters'.
With prefix argument, this command enables European character display
! if arg is positive, disables it otherwise. Otherwise, it toggles
European character display.
When this mode is enabled, characters in the range of 160 to 255
--- 219,225 ----
variable, or else customize `enable-multibyte-characters'.
With prefix argument, this command enables European character display
! if ARG is positive, disables it otherwise. Otherwise, it toggles
European character display.
When this mode is enabled, characters in the range of 160 to 255
***************
*** 264,268 ****
(provide 'disp-table)
! ;;; arch-tag: ffe4c28c-960c-47aa-b8a8-ae89d371ffc7
;;; disp-table.el ends here
--- 263,267 ----
(provide 'disp-table)
! ;; arch-tag: ffe4c28c-960c-47aa-b8a8-ae89d371ffc7
;;; disp-table.el ends here
*** faces.el Fri Aug 3 19:52:22 2007
--- faces.el Thu Sep 27 08:46:56 2007
***************
*** 222,232 ****
(defun face-id (face &optional frame)
"Return the internal ID of face with name FACE.
The optional argument FRAME is ignored, since the internal face ID
of a face name is the same for all frames."
(check-face face)
! (get face 'face))
!
(defun face-equal (face1 face2 &optional frame)
"Non-nil if faces FACE1 and FACE2 are equal.
--- 222,233 ----
(defun face-id (face &optional frame)
"Return the internal ID of face with name FACE.
+ If FACE is a face-alias, return the ID of the target face.
The optional argument FRAME is ignored, since the internal face ID
of a face name is the same for all frames."
(check-face face)
! (or (get face 'face)
! (face-id (get face 'face-alias))))
(defun face-equal (face1 face2 &optional frame)
"Non-nil if faces FACE1 and FACE2 are equal.
***************
*** 1193,1199 ****
(error "No faces matching \"%s\"" regexp))
(setq max-length (1+ max-length)
line-format (format "%%-%ds" max-length))
! (with-output-to-temp-buffer "*Faces*"
(save-excursion
(set-buffer standard-output)
(setq truncate-lines t)
--- 1194,1200 ----
(error "No faces matching \"%s\"" regexp))
(setq max-length (1+ max-length)
line-format (format "%%-%ds" max-length))
! (with-help-window "*Faces*"
(save-excursion
(set-buffer standard-output)
(setq truncate-lines t)
***************
*** 1234,1241 ****
(while (not (eobp))
(insert-char ?\s max-length)
(forward-line 1))))
! (goto-char (point-min)))
! (print-help-return-message))
;; If the *Faces* buffer appears in a different frame,
;; copy all the face definitions from FRAME,
;; so that the display will reflect the frame that was selected.
--- 1235,1241 ----
(while (not (eobp))
(insert-char ?\s max-length)
(forward-line 1))))
! (goto-char (point-min))))
;; If the *Faces* buffer appears in a different frame,
;; copy all the face definitions from FRAME,
;; so that the display will reflect the frame that was selected.
***************
*** 1280,1286 ****
(setq face 'default))
(if (not (listp face))
(setq face (list face)))
! (with-output-to-temp-buffer (help-buffer)
(save-excursion
(set-buffer standard-output)
(dolist (f face)
--- 1280,1286 ----
(setq face 'default))
(if (not (listp face))
(setq face (list face)))
! (with-help-window (help-buffer)
(save-excursion
(set-buffer standard-output)
(dolist (f face)
***************
*** 1326,1333 ****
(re-search-backward ": \\([^:]+\\)" nil t)
(help-xref-button 1 'help-face attr)))
(insert "\n")))))
! (terpri)))
! (print-help-return-message))))
\f
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
--- 1326,1332 ----
(re-search-backward ": \\([^:]+\\)" nil t)
(help-xref-button 1 'help-face attr)))
(insert "\n")))))
! (terpri))))))
\f
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
***************
*** 1505,1532 ****
(get face 'saved-face)
(face-default-spec face)))
- (defsubst face-normalize-spec (spec)
- "Return a normalized face-spec of SPEC."
- (let (normalized-spec)
- (while spec
- (let ((attribute (car spec))
- (value (car (cdr spec))))
- ;; Support some old-style attribute names and values.
- (case attribute
- (:bold (setq attribute :weight value (if value 'bold 'normal)))
- (:italic (setq attribute :slant value (if value 'italic 'normal)))
- ((:foreground :background)
- ;; Compatibility with 20.x. Some bogus face specs seem to
- ;; exist containing things like `:foreground nil'.
- (if (null value) (setq value 'unspecified)))
- (t (unless (assq attribute face-x-resources)
- (setq attribute nil))))
- (when attribute
- (push attribute normalized-spec)
- (push value normalized-spec)))
- (setq spec (cdr (cdr spec))))
- (nreverse normalized-spec)))
-
\f
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Frame-type independent color support.
--- 1504,1509 ----
***************
*** 1669,1676 ****
;; be unmodified, so we can avoid consing in the common case.
(dolist (face (face-list))
(when (not (face-spec-match-p face
! (face-normalize-spec
! (face-user-default-spec face))
(selected-frame)))
(push face locally-modified-faces)))
;; Now change to the new frame parameters
--- 1646,1652 ----
;; be unmodified, so we can avoid consing in the common case.
(dolist (face (face-list))
(when (not (face-spec-match-p face
! (face-user-default-spec face)
(selected-frame)))
(push face locally-modified-faces)))
;; Now change to the new frame parameters
*** help-fns.el Wed Jul 25 06:47:20 2007
--- help-fns.el Thu Sep 27 08:11:54 2007
***************
*** 55,67 ****
(message "You didn't specify a function")
(help-setup-xref (list #'describe-function function) (interactive-p))
(save-excursion
! (with-output-to-temp-buffer (help-buffer)
(prin1 function)
;; Use " is " instead of a colon so that
;; it is easier to get out the function name using forward-sexp.
(princ " is ")
(describe-function-1 function)
- (print-help-return-message)
(with-current-buffer standard-output
;; Return the text we displayed.
(buffer-string))))))
--- 55,66 ----
(message "You didn't specify a function")
(help-setup-xref (list #'describe-function function) (interactive-p))
(save-excursion
! (with-help-window (help-buffer)
(prin1 function)
;; Use " is " instead of a colon so that
;; it is easier to get out the function name using forward-sexp.
(princ " is ")
(describe-function-1 function)
(with-current-buffer standard-output
;; Return the text we displayed.
(buffer-string))))))
***************
*** 232,237 ****
--- 231,253 ----
libname)
file))))
+ (defun find-source-lisp-file (file-name)
+ (let* ((elc-file (locate-file (concat file-name
+ (if (string-match "\\.el" file-name)
+ "c"
+ ".elc"))
+ load-path))
+ (str (if (and elc-file (file-readable-p elc-file))
+ (with-temp-buffer
+ (insert-file-contents-literally elc-file nil 0 256)
+ (buffer-string))))
+ (src-file (and str
+ (string-match ";;; from file \\(.*\\.el\\)" str)
+ (match-string 1 str))))
+ (if (and src-file (file-readable-p src-file))
+ src-file
+ file-name)))
+
;;;###autoload
(defun describe-function-1 (function)
(let* ((def (if (symbolp function)
***************
*** 309,314 ****
--- 325,334 ----
;; but that's completely wrong when the user used load-file.
(princ (if (eq file-name 'C-source) "C source code" file-name))
(princ "'")
+ ;; See if lisp files are present where they where installed from.
+ (if (not (eq file-name 'C-source))
+ (setq file-name (find-source-lisp-file file-name)))
+
;; Make a hyperlink to the library.
(with-current-buffer standard-output
(save-excursion
***************
*** 457,463 ****
val-start-pos)
(help-setup-xref (list #'describe-variable variable buffer)
(interactive-p))
! (with-output-to-temp-buffer (help-buffer)
(with-current-buffer buffer
(prin1 variable)
;; Make a hyperlink to the library if appropriate. (Don't
--- 477,483 ----
val-start-pos)
(help-setup-xref (list #'describe-variable variable buffer)
(interactive-p))
! (with-help-window (help-buffer)
(with-current-buffer buffer
(prin1 variable)
;; Make a hyperlink to the library if appropriate. (Don't
***************
*** 608,614 ****
(re-search-backward
(concat "\\(" customize-label "\\)") nil t)
(help-xref-button 1 'help-customize-variable variable)))))
- (print-help-return-message)
(save-excursion
(set-buffer standard-output)
;; Return the text we displayed.
--- 628,633 ----
***************
*** 623,629 ****
(interactive)
(setq buffer (or buffer (current-buffer)))
(help-setup-xref (list #'describe-syntax buffer) (interactive-p))
! (with-output-to-temp-buffer (help-buffer)
(let ((table (with-current-buffer buffer (syntax-table))))
(with-current-buffer standard-output
(describe-vector table 'internal-describe-syntax-value)
--- 642,648 ----
(interactive)
(setq buffer (or buffer (current-buffer)))
(help-setup-xref (list #'describe-syntax buffer) (interactive-p))
! (with-help-window (help-buffer)
(let ((table (with-current-buffer buffer (syntax-table))))
(with-current-buffer standard-output
(describe-vector table 'internal-describe-syntax-value)
***************
*** 648,654 ****
(interactive)
(setq buffer (or buffer (current-buffer)))
(help-setup-xref (list #'describe-categories buffer) (interactive-p))
! (with-output-to-temp-buffer (help-buffer)
(let ((table (with-current-buffer buffer (category-table))))
(with-current-buffer standard-output
(describe-vector table 'help-describe-category-set)
--- 667,673 ----
(interactive)
(setq buffer (or buffer (current-buffer)))
(help-setup-xref (list #'describe-categories buffer) (interactive-p))
! (with-help-window (help-buffer)
(let ((table (with-current-buffer buffer (category-table))))
(with-current-buffer standard-output
(describe-vector table 'help-describe-category-set)
*** help-mode.el Sun Aug 12 10:00:02 2007
--- help-mode.el Mon Aug 27 09:51:10 2007
***************
*** 40,45 ****
--- 40,46 ----
(define-key help-mode-map [mouse-2] 'help-follow-mouse)
(define-key help-mode-map "\C-c\C-b" 'help-go-back)
+ (define-key help-mode-map "\C-c\C-f" 'help-go-forward)
(define-key help-mode-map "\C-c\C-c" 'help-follow-symbol)
;; Documentation only, since we use minor-mode-overriding-map-alist.
(define-key help-mode-map "\r" 'help-follow)
***************
*** 52,64 ****
--- 53,80 ----
(put 'help-xref-stack 'permanent-local t)
(make-variable-buffer-local 'help-xref-stack)
+ (defvar help-xref-forward-stack nil
+ "The stack of used to navigate help forwards after using the back button.
+ Used by `help-follow' and `help-xref-go-forward'.
+ An element looks like (POSITION FUNCTION ARGS...).
+ To use the element, do (apply FUNCTION ARGS) then goto the point.")
+ (put 'help-xref-forward-stack 'permanent-local t)
+ (make-variable-buffer-local 'help-xref-forward-stack)
+
(defvar help-xref-stack-item nil
"An item for `help-follow' in this buffer to push onto `help-xref-stack'.
The format is (FUNCTION ARGS...).")
(put 'help-xref-stack-item 'permanent-local t)
(make-variable-buffer-local 'help-xref-stack-item)
+ (defvar help-xref-stack-forward-item nil
+ "An item for `help-go-back' to push onto `help-xref-forward-stack'.
+ The format is (FUNCTION ARGS...).")
+ (put 'help-xref-stack-forward-item 'permanent-local t)
+ (make-variable-buffer-local 'help-xref-stack-forward-item)
+
(setq-default help-xref-stack nil help-xref-stack-item nil)
+ (setq-default help-xref-forward-stack nil help-xref-forward-stack-item nil)
(defcustom help-mode-hook nil
"Hook run by `help-mode'."
***************
*** 123,128 ****
--- 139,149 ----
'help-function #'help-xref-go-back
'help-echo (purecopy "mouse-2, RET: go back to previous help buffer"))
+ (define-button-type 'help-forward
+ :supertype 'help-xref
+ 'help-function #'help-xref-go-forward
+ 'help-echo (purecopy "mouse-2, RET: move forward to next help buffer"))
+
(define-button-type 'help-info
:supertype 'help-xref
'help-function #'info
***************
*** 201,212 ****
(setq mode-name "Help")
(setq major-mode 'help-mode)
(view-mode)
! (make-local-variable 'view-no-disable-on-exit)
! (setq view-no-disable-on-exit t)
! (setq view-exit-action (lambda (buffer)
! (or (window-minibuffer-p (selected-window))
! (one-window-p t)
! (delete-window))))
(run-mode-hooks 'help-mode-hook))
;;;###autoload
--- 222,235 ----
(setq mode-name "Help")
(setq major-mode 'help-mode)
(view-mode)
! (set (make-local-variable 'view-no-disable-on-exit) t)
! (setq view-exit-action
! (lambda (buffer)
! (with-current-buffer buffer
! ;; Use `with-current-buffer' to assert that `bury-buffer'
! ;; removes buffer from the selected window. Leave it to
! ;; `view-mode-exit' to delete the associated window(s).
! (bury-buffer))))
(run-mode-hooks 'help-mode-hook))
;;;###autoload
***************
*** 216,231 ****
;;;###autoload
(defun help-mode-finish ()
! (let ((entry (assq (selected-window) view-return-to-alist)))
! (if entry
! ;; When entering Help mode from the Help window,
! ;; such as by following a link, preserve the same
! ;; meaning for the q command.
! ;; (setcdr entry (cons (selected-window) help-return-method))
! nil
! (setq view-return-to-alist
! (cons (cons (selected-window) help-return-method)
! view-return-to-alist))))
(when (eq major-mode 'help-mode)
;; View mode's read-only status of existing *Help* buffer is lost
;; by with-output-to-temp-buffer.
--- 239,262 ----
;;;###autoload
(defun help-mode-finish ()
! (if help-window-list
! ;; If `help-window-list' is non-nil, `view-return-to-alist'
! ;; is handled by `help-window-finish'. We just prepend the
! ;; selected window to `help-window-list' here since now is
! ;; the only moment where we can unambiguously identify it.
! (setq help-window-list
! (cons (selected-window) help-window-list))
! (let ((entry (assq (selected-window) view-return-to-alist)))
! (if entry
! ;; When entering Help mode from the Help window,
! ;; such as by following a link, preserve the same
! ;; meaning for the q command.
! ;; (setcdr entry (cons (selected-window) help-return-method))
! nil
! (setq view-return-to-alist
! (cons (cons (selected-window) help-return-method)
! view-return-to-alist)))))
!
(when (eq major-mode 'help-mode)
;; View mode's read-only status of existing *Help* buffer is lost
;; by with-output-to-temp-buffer.
***************
*** 242,247 ****
--- 273,281 ----
(defvar help-back-label (purecopy "[back]")
"Label to use by `help-make-xrefs' for the go-back reference.")
+ (defvar help-forward-label (purecopy "[forward]")
+ "Label to use by `help-make-xrefs' for the go-forward reference.")
+
(defconst help-xref-symbol-regexp
(purecopy (concat "\\(\\<\\(\\(variable\\|option\\)\\|" ; Link to var
"\\(function\\|command\\)\\|" ; Link to function
***************
*** 286,292 ****
restore it properly when going back."
(with-current-buffer (help-buffer)
(when help-xref-stack-item
! (push (cons (point) help-xref-stack-item) help-xref-stack))
(when interactive-p
(let ((tail (nthcdr 10 help-xref-stack)))
;; Truncate the stack.
--- 320,327 ----
restore it properly when going back."
(with-current-buffer (help-buffer)
(when help-xref-stack-item
! (push (cons (point) help-xref-stack-item) help-xref-stack)
! (setq help-xref-forward-stack nil))
(when interactive-p
(let ((tail (nthcdr 10 help-xref-stack)))
;; Truncate the stack.
***************
*** 477,487 ****
(while (and (not (bobp)) (bolp))
(delete-char -1))
(insert "\n")
;; Make a back-reference in this buffer if appropriate.
(when help-xref-stack
- (insert "\n")
(help-insert-xref-button help-back-label 'help-back
! (current-buffer))
(insert "\n")))
;; View mode steals RET from us.
(set (make-local-variable 'minor-mode-overriding-map-alist)
--- 512,530 ----
(while (and (not (bobp)) (bolp))
(delete-char -1))
(insert "\n")
+ (when (or help-xref-stack help-xref-forward-stack)
+ (insert "\n"))
;; Make a back-reference in this buffer if appropriate.
(when help-xref-stack
(help-insert-xref-button help-back-label 'help-back
! (current-buffer)))
! ;; Make a forward-reference in this buffer if appropriate.
! (when help-xref-forward-stack
! (when help-xref-stack
! (insert "\t"))
! (help-insert-xref-button help-forward-label 'help-forward
! (current-buffer)))
! (when (or help-xref-stack help-xref-forward-stack)
(insert "\n")))
;; View mode steals RET from us.
(set (make-local-variable 'minor-mode-overriding-map-alist)
***************
*** 600,605 ****
--- 643,649 ----
"From BUFFER, go back to previous help buffer text using `help-xref-stack'."
(let (item position method args)
(with-current-buffer buffer
+ (push (cons (point) help-xref-stack-item) help-xref-forward-stack)
(when help-xref-stack
(setq item (pop help-xref-stack)
;; Clear the current item so that it won't get pushed
***************
*** 615,626 ****
--- 659,697 ----
(set-window-point (get-buffer-window buffer) position)
(goto-char position)))))
+ (defun help-xref-go-forward (buffer)
+ "From BUFFER, go forward to next help buffer."
+ (let (item position method args)
+ (with-current-buffer buffer
+ (push (cons (point) help-xref-stack-item) help-xref-stack)
+ (when help-xref-forward-stack
+ (setq item (pop help-xref-forward-stack)
+ ;; Clear the current item so that it won't get pushed
+ ;; by the function we're about to call. TODO: We could also
+ ;; push it onto a "forward" stack and add a `forw' button.
+ help-xref-stack-item nil
+ position (car item)
+ method (cadr item)
+ args (cddr item))))
+ (apply method args)
+ (with-current-buffer buffer
+ (if (get-buffer-window buffer)
+ (set-window-point (get-buffer-window buffer) position)
+ (goto-char position)))))
+
(defun help-go-back ()
"Go back to previous topic in this help buffer."
(interactive)
(if help-xref-stack
(help-xref-go-back (current-buffer))
(error "No previous help buffer")))
+
+ (defun help-go-forward ()
+ "Go back to next topic in this help buffer."
+ (interactive)
+ (if help-xref-forward-stack
+ (help-xref-go-forward (current-buffer))
+ (error "No next help buffer")))
(defun help-do-xref (pos function args)
"Call the help cross-reference function FUNCTION with args ARGS.
*** help.el Mon Aug 6 07:56:36 2007
--- help.el Thu Sep 27 08:30:54 2007
***************
*** 123,128 ****
--- 123,130 ----
If FUNCTION is nil, it applies `message', thus displaying the message.
In addition, this function sets up `help-return-method', which see, that
specifies what to do when the user exits the help buffer."
+ ;; Reset `help-window-list' to avoid messing up `help-mode-finish'.
+ (setq help-window-list nil)
(and (not (get-buffer-window standard-output))
(let ((first-message
(cond ((or
***************
*** 429,435 ****
To record all your input on a file, use `open-dribble-file'."
(interactive)
(help-setup-xref (list #'view-lossage) (interactive-p))
! (with-output-to-temp-buffer (help-buffer)
(princ (mapconcat (lambda (key)
(if (or (integerp key) (symbolp key) (listp key))
(single-key-description key)
--- 431,437 ----
To record all your input on a file, use `open-dribble-file'."
(interactive)
(help-setup-xref (list #'view-lossage) (interactive-p))
! (with-help-window (help-buffer)
(princ (mapconcat (lambda (key)
(if (or (integerp key) (symbolp key) (listp key))
(single-key-description key)
***************
*** 441,448 ****
(while (progn (move-to-column 50) (not (eobp)))
(when (search-forward " " nil t)
(delete-char -1))
! (insert "\n")))
! (print-help-return-message)))
\f
;; Key bindings
--- 443,449 ----
(while (progn (move-to-column 50) (not (eobp)))
(when (search-forward " " nil t)
(delete-char -1))
! (insert "\n")))))
\f
;; Key bindings
***************
*** 717,723 ****
(setq sequence (vector up-event))
(aset sequence 0 'mouse-1)
(setq defn-up-tricky (key-binding sequence nil nil (event-start up-event))))))
! (with-output-to-temp-buffer (help-buffer)
(princ (help-key-description key untranslated))
(princ (format "\
%s runs the command %S
--- 718,724 ----
(setq sequence (vector up-event))
(aset sequence 0 'mouse-1)
(setq defn-up-tricky (key-binding sequence nil nil (event-start up-event))))))
! (with-help-window (help-buffer)
(princ (help-key-description key untranslated))
(princ (format "\
%s runs the command %S
***************
*** 753,760 ****
ev-type mouse-msg
mouse-1-click-follows-link
defn-up-tricky))
! (describe-function-1 defn-up-tricky)))
! (print-help-return-message)))))
\f
(defun describe-mode (&optional buffer)
"Display documentation of current major mode and minor modes.
--- 754,760 ----
ev-type mouse-msg
mouse-1-click-follows-link
defn-up-tricky))
! (describe-function-1 defn-up-tricky)))))))
\f
(defun describe-mode (&optional buffer)
"Display documentation of current major mode and minor modes.
***************
*** 771,777 ****
(interactive-p))
;; For the sake of help-do-xref and help-xref-go-back,
;; don't switch buffers before calling `help-buffer'.
! (with-output-to-temp-buffer (help-buffer)
(with-current-buffer buffer
(let (minor-modes)
;; Older packages do not register in minor-mode-list but only in
--- 771,777 ----
(interactive-p))
;; For the sake of help-do-xref and help-xref-go-back,
;; don't switch buffers before calling `help-buffer'.
! (with-help-window (help-buffer)
(with-current-buffer buffer
(let (minor-modes)
;; Older packages do not register in minor-mode-list but only in
***************
*** 839,846 ****
(insert (format-mode-line mode))
(add-text-properties start (point) '(face bold)))))
(princ " mode:\n")
! (princ (documentation major-mode)))
! (print-help-return-message))))
(defun describe-minor-mode (minor-mode)
--- 839,845 ----
(insert (format-mode-line mode))
(add-text-properties start (point) '(face bold)))))
(princ " mode:\n")
! (princ (documentation major-mode))))))
(defun describe-minor-mode (minor-mode)
***************
*** 973,978 ****
--- 972,1182 ----
temp-buffer-max-height))))
\f
+ ;;; help-window
+
+ (defcustom help-window-select 'other
+ "Non-nil means select help window for viewing.
+ Choices are:
+
+ never .... select help window only if there's no other window
+
+ other .... select help window unless it's the only other window
+
+ always ... always select the help window."
+ :type '(choice (const :tag "never" nil)
+ (const :tag "other" other)
+ (const :tag "always" t))
+ :group 'help
+ :version "23.1")
+
+ ;; At the time `help-window-list' is read by `help-window-finish' it's a
+ ;; list composed as follows:
+
+ ;; nth 0 ... the window selected by `display-buffer' (prepended by
+ ;; `help-mode-finish'). `help-window-finish' may try to
+ ;; select that window according to the current value of
+ ;; `help-window-select'.
+
+ ;; nth 1 ... the window selected when `with-help-window' was invoked
+ ;; (set by `help-window-setup'). `help-window-finish' will
+ ;; try to install an entry in `view-return-to-alist' to
+ ;; reselect this window when the user quits help.
+
+ ;; nth 2..n ... a (window window-buffer window-start window-point)
+ ;; quadruple for each window displayed at the time
+ ;; `with-help-window' was invoked (set by
+ ;; `help-window-setup'). `help-window-finish' may use this
+ ;; information to restore the previous contents of the window
+ ;; displaying help information when the user quits help.
+ (defvar help-window-list nil)
+
+ (defun help-window-setup ()
+ "Setup `help-window-list' before displaying the help buffer."
+ (walk-windows
+ (lambda (window)
+ ;; Add (window window-buffer window-start window-point) quadruple
+ ;; for each live window.
+ (setq help-window-list
+ (cons
+ (list window (window-buffer window)
+ (window-start window) (window-point window))
+ help-window-list)))
+ 'no-mini t)
+ ;; Prepend the selected window.
+ (setq help-window-list
+ (cons (selected-window) help-window-list)))
+
+ (defun help-window-scrolling-text (window &optional other)
+ "Return string telling how to scroll help window WINDOW.
+ Optional argument OTHER non-nil means return text telling how to
+ scroll the other window. Return \".\" if the end of the buffer
+ displayed in WINDOW is visible in WINDOW."
+ (cond
+ ((pos-visible-in-window-p
+ (with-current-buffer (window-buffer window)
+ (point-max)) window)
+ ;; Buffer end is visible.
+ ".")
+ (other ", \\[scroll-other-window] to scroll help.")
+ (t ", \\[scroll-up] to scroll help.")))
+
+ (defun help-window-select-window (window &optional reuse)
+ "If appropriate select help window WINDOW and display message.
+ WINDOW is selected if the current value of the variable
+ `help-window-select' demands it. A message is displayed only if
+ it makes sense in the present context.
+
+ Use this function only if WINDOW's buffer is in `view-mode'.
+ Otherwise, the displayed message might not make sense."
+ (let ((frame (window-frame window)))
+ (cond
+ ;; Comment in the following in case we should care iff help window
+ ;; and selected window are on the same frame.
+ ;;; ((not (eq frame (window-frame (selected-window)))))
+ ((eq window (selected-window))
+ ;; Probably the `pop-up-windows' nil case, tell how to quit
+ ;; view-mode and scroll the window.
+ (message
+ (substitute-command-keys
+ (concat "Type \"q\" to quit" (help-window-scrolling-text window)))))
+ ((= (length (window-list frame 'no-mini)) 2)
+ ;; There are two windows on the help window's frame.
+ (if (memq help-window-select '(nil other))
+ ;; The user doesn't want to select the help window.
+ (if reuse
+ ;; Offer `display-buffer' for consistency with
+ ;; `print-help-return-message'.
+ (message
+ (substitute-command-keys
+ (concat "Type \\[display-buffer] RET to restore the other window"
+ (help-window-scrolling-text window t))))
+ ;; The classic "two windows" configuration.
+ (message
+ (substitute-command-keys
+ (concat "Type \\[delete-other-windows] to quit"
+ (help-window-scrolling-text window t)))))
+ ;; Select help window and offer view-mode's quit.
+ (select-window window)
+ (message
+ (substitute-command-keys
+ (concat "Type \"q\" to quit"
+ (help-window-scrolling-text window))))))
+ ;; Issuing a message when we reuse one out of >= 3 windows on the
+ ;; same frame without also selecting that window doesn't make any
+ ;; sense. We leave it to `view-mode-exit' to DTRT when the user
+ ;; eventually selects that window and types "q". Below we handle
+ ;; only the case where the help window gets selected by us.
+ (help-window-select
+ ;; Select help window and offer view-mode's quit.
+ (select-window window)
+ (message
+ (substitute-command-keys
+ (concat "Type \"q\" to quit"
+ (help-window-scrolling-text window))))))))
+
+ (defun help-window-finish ()
+ "Process `help-window-list' after displaying the help buffer."
+ (let* ((window (car help-window-list))
+ (buffer (window-buffer window))
+ ;; `window' is now the help window and `buffer' it's buffer.
+ (old-window (cadr help-window-list))
+ ;; `old-window' is the window selected at the time help was
+ ;; invoked.
+ entry)
+ ;; The following conditional has to work with _any_ window selected
+ ;; and _any_ buffer current: `help-window-select-window' must be
+ ;; able to select `window' and make `buffer' current. Hence, using
+ ;; `with-current-buffer' wouldn't make sense here.
+ (cond
+ ((setq entry
+ (assq window
+ (buffer-local-value 'view-return-to-alist buffer)))
+ ;; `view-return-to-alist' has an entry for `window'.
+ (if (eq window old-window)
+ ;; If the help window is the same as the window selected at
+ ;; the time help was invoked, it's probably the result of
+ ;; following a backward/forward button or a cross reference.
+ ;; In this case, just purge stale entries from the buffer's
+ ;; `view-return-to-alist' but leave `entry' alone.
+ (view-return-to-alist-update buffer)
+ ;; We had an existing view-mode window but help was invoked
+ ;; while another one was selected. In this case, reuse exit
+ ;; information from old entry but try to select `old-window'
+ ;; when the user quits.
+ (view-return-to-alist-update
+ buffer (cons window (cons old-window (cddr entry))))
+ (help-window-select-window window)))
+ ((setq entry (assq window (cddr help-window-list)))
+ ;; `view-return-to-alist' didn't have an entry for `window' but
+ ;; `help-window-list' did; so we know that `display-buffer' has
+ ;; reused an existing window.
+ (if (eq (cadr entry) buffer)
+ ;; The help window displayed the help buffer before but no
+ ;; `view-return-to-alist' entry was found probably because the
+ ;; user manually switched to the help buffer. Let `View-quit'
+ ;; do `quit-window' although `view-exit-action' should be able
+ ;; to handle this case all by itself.
+ (progn
+ (view-return-to-alist-update
+ buffer (cons window (cons (selected-window) 'quit-window)))
+ (help-window-select-window window t))
+ ;; The help window displayed another buffer before. Set up
+ ;; things so `View-quit' can orderly show that buffer again.
+ ;; It's this case which necessitates to add window-start and
+ ;; window-point information to `help-window-list'.
+ (view-return-to-alist-update
+ buffer (cons window (cons (selected-window) (cdr entry))))
+ (help-window-select-window window t)))
+ (t
+ ;; No entry found for `window'. This means `display-buffer' has
+ ;; created a new window that should be deleted by `View-quit'.
+ (view-return-to-alist-update
+ buffer (cons window (cons (selected-window) t)))
+ (help-window-select-window window)))))
+
+ (defmacro with-help-window (buffer-name &rest body)
+ "Show buffer BUFFER-NAME in a help window evaluating BODY.
+ This macro provides the behavior of `with-output-to-temp-buffer'
+ paired with `print-help-return-message' and the following twists:
+
+ - The help window may be selected according to the value of the
+ customizable variable `help-window-select'.
+
+ - Quitting the help window with `View-quit' should restore the
+ associated frame's previous state more accurately.
+
+ - Messages telling how to quit the help window should be more
+ accurate.
+
+ Caution: Using `print-help-return-message' in BODY will make
+ with-help-window behave like `with-output-to-temp-buffer'."
+ (declare (indent 1) (debug t))
+ `(let (help-window-list)
+ (help-window-setup)
+ (with-output-to-temp-buffer ,buffer-name
+ (progn ,@body))
+ (help-window-finish)))
+ \f
(provide 'help)
;; arch-tag: cf427352-27e9-49b7-9a6f-741ebab02423
*** view.el Thu Sep 27 07:39:12 2007
--- view.el Thu Sep 27 07:53:08 2007
***************
*** 146,155 ****
(put 'view-return-to-alist 'permanent-local t)
(defvar view-exit-action nil
! "nil or a function with one argument (a buffer) called when finished viewing.
! This is local in each buffer being viewed.
! The \\[view-file] and \\[view-file-other-window] commands may set this to
! `kill-buffer'.")
(make-variable-buffer-local 'view-exit-action)
(defvar view-no-disable-on-exit nil
--- 146,156 ----
(put 'view-return-to-alist 'permanent-local t)
(defvar view-exit-action nil
! "If non-nil a function with one argument (a buffer) called when finished viewing.
! This is local in each buffer being viewed. The \\[view-file] and
! \\[view-file-other-window] commands may set this to `kill-buffer'.
! Observe that the buffer might not appear in any window when this
! function is called.")
(make-variable-buffer-local 'view-exit-action)
(defvar view-no-disable-on-exit nil
***************
*** 241,251 ****
;;;###autoload
(defun view-file (file)
"View FILE in View mode, returning to previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead,
! a special set of commands (mostly letters and punctuation)
! are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'."
(interactive "fView file: ")
--- 242,252 ----
;;;###autoload
(defun view-file (file)
"View FILE in View mode, returning to previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead, a
! special set of commands (mostly letters and punctuation) are defined for
! moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'."
(interactive "fView file: ")
***************
*** 263,274 ****
;;;###autoload
(defun view-file-other-window (file)
"View FILE in View mode in another window.
! Return that window to its previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead,
! a special set of commands (mostly letters and punctuation)
! are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'."
(interactive "fIn other window view file: ")
--- 264,275 ----
;;;###autoload
(defun view-file-other-window (file)
"View FILE in View mode in another window.
! Return that window to its previous buffer when done. Emacs commands
! editing the buffer contents are not available; instead, a special set of
! commands (mostly letters and punctuation) are defined for moving around
! in the buffer.
Space scrolls forward, Delete scrolls backward.
! For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'."
(interactive "fIn other window view file: ")
***************
*** 281,291 ****
(defun view-file-other-frame (file)
"View FILE in View mode in another frame.
Maybe delete other frame and/or return to previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead,
! a special set of commands (mostly letters and punctuation)
! are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'."
(interactive "fIn other frame view file: ")
--- 282,292 ----
(defun view-file-other-frame (file)
"View FILE in View mode in another frame.
Maybe delete other frame and/or return to previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead, a
! special set of commands (mostly letters and punctuation) are defined for
! moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'."
(interactive "fIn other frame view file: ")
***************
*** 298,315 ****
;;;###autoload
(defun view-buffer (buffer &optional exit-action)
"View BUFFER in View mode, returning to previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead,
! a special set of commands (mostly letters and punctuation)
! are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.
Optional argument EXIT-ACTION is either nil or a function with buffer as
! argument. This function is called when finished viewing buffer.
! Use this argument instead of explicitly setting `view-exit-action'."
!
(interactive "bView buffer: ")
(let ((undo-window (list (window-buffer) (window-start) (window-point))))
(switch-to-buffer buffer)
--- 299,315 ----
;;;###autoload
(defun view-buffer (buffer &optional exit-action)
"View BUFFER in View mode, returning to previous buffer when done.
! Emacs commands editing the buffer contents are not available; instead, a
! special set of commands (mostly letters and punctuation) are defined for
! moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.
Optional argument EXIT-ACTION is either nil or a function with buffer as
! argument. This function is called when finished viewing buffer. Use
! this argument instead of explicitly setting `view-exit-action'."
(interactive "bView buffer: ")
(let ((undo-window (list (window-buffer) (window-start) (window-point))))
(switch-to-buffer buffer)
***************
*** 319,336 ****
;;;###autoload
(defun view-buffer-other-window (buffer &optional not-return exit-action)
"View BUFFER in View mode in another window.
! Return to previous buffer when done, unless optional NOT-RETURN is non-nil.
! Emacs commands editing the buffer contents are not available; instead,
! a special set of commands (mostly letters and punctuation)
! are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.
Optional argument EXIT-ACTION is either nil or a function with buffer as
! argument. This function is called when finished viewing buffer.
! Use this argument instead of explicitly setting `view-exit-action'."
(interactive "bIn other window view buffer:\nP")
(let* ((win ; This window will be selected by
(get-lru-window)) ; switch-to-buffer-other-window below.
--- 319,336 ----
;;;###autoload
(defun view-buffer-other-window (buffer &optional not-return exit-action)
"View BUFFER in View mode in another window.
! Return to previous buffer when done, unless optional NOT-RETURN is
! non-nil. Emacs commands editing the buffer contents are not available;
! instead, a special set of commands (mostly letters and punctuation) are
! defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.
Optional argument EXIT-ACTION is either nil or a function with buffer as
! argument. This function is called when finished viewing buffer. Use
! this argument instead of explicitly setting `view-exit-action'."
(interactive "bIn other window view buffer:\nP")
(let* ((win ; This window will be selected by
(get-lru-window)) ; switch-to-buffer-other-window below.
***************
*** 350,367 ****
;;;###autoload
(defun view-buffer-other-frame (buffer &optional not-return exit-action)
"View BUFFER in View mode in another frame.
! Return to previous buffer when done, unless optional NOT-RETURN is non-nil.
! Emacs commands editing the buffer contents are not available; instead,
! a special set of commands (mostly letters and punctuation)
! are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.
Optional argument EXIT-ACTION is either nil or a function with buffer as
! argument. This function is called when finished viewing buffer.
! Use this argument instead of explicitly setting `view-exit-action'."
(interactive "bView buffer in other frame: \nP")
(let ((return-to
(and (not not-return) (cons (selected-window) t)))) ; Old window.
--- 350,367 ----
;;;###autoload
(defun view-buffer-other-frame (buffer &optional not-return exit-action)
"View BUFFER in View mode in another frame.
! Return to previous buffer when done, unless optional NOT-RETURN is
! non-nil. Emacs commands editing the buffer contents are not available;
! instead, a special set of commands (mostly letters and punctuation) are
! defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
! For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.
Optional argument EXIT-ACTION is either nil or a function with buffer as
! argument. This function is called when finished viewing buffer. Use
! this argument instead of explicitly setting `view-exit-action'."
(interactive "bView buffer in other frame: \nP")
(let ((return-to
(and (not not-return) (cons (selected-window) t)))) ; Old window.
***************
*** 375,382 ****
;; bindings instead of using the \\[] construction. The reason for this
;; is that most commands have more than one key binding.
"Toggle View mode, a minor mode for viewing text but not editing it.
! With prefix argument ARG, turn View mode on if ARG is positive, otherwise
! turn it off.
Emacs commands that do not change the buffer contents are available as usual.
Kill commands insert text in kill buffers but do not delete. Other commands
--- 375,381 ----
;; bindings instead of using the \\[] construction. The reason for this
;; is that most commands have more than one key binding.
"Toggle View mode, a minor mode for viewing text but not editing it.
! With ARG, turn View mode on iff ARG is positive.
Emacs commands that do not change the buffer contents are available as usual.
Kill commands insert text in kill buffers but do not delete. Other commands
***************
*** 495,500 ****
--- 494,531 ----
(setq buffer-read-only view-old-buffer-read-only)))
;;;###autoload
+ (defun view-return-to-alist-update (buffer &optional item)
+ "Update `view-return-to-alist' of buffer BUFFER.
+ Any entries referencing the selected window as well as entries
+ referencing dead windows are purged from `view-return-to-alist'. Adds
+ optional argument ITEM to `view-return-to-alist' after updating. For a
+ decsription of items that can be added compare the RETURN-TO-ALIST
+ argument of the function `view-mode-exit'."
+ (with-current-buffer buffer
+ (when view-return-to-alist
+ (let* ((list view-return-to-alist)
+ entry entry-window last)
+ ;; cdr-down list.
+ (while list
+ (setq entry (car list))
+ (setq entry-window (car entry))
+ (if (and (windowp entry-window)
+ (or (and item (eq entry-window (selected-window)))
+ (not (window-live-p entry-window))))
+ ;; Remove that entry.
+ (if last
+ (setcdr last (cdr list))
+ (setq view-return-to-alist
+ (cdr view-return-to-alist)))
+ ;; Leave entry alone.
+ (setq last entry))
+ (setq list (cdr list)))))
+ ;; Add ITEM.
+ (when item
+ (setq view-return-to-alist
+ (cons item view-return-to-alist)))))
+
+ ;;;###autoload
(defun view-mode-enter (&optional return-to exit-action) "\
Enter View mode and set up exit from view mode depending on optional arguments.
If RETURN-TO is non-nil it is added as an element to the buffer local alist
***************
*** 532,619 ****
\f
(defun view-mode-exit (&optional return-to-alist exit-action all-win)
"Exit View mode in various ways, depending on optional arguments.
! RETURN-TO-ALIST, EXIT-ACTION and ALL-WIN determine what to do after exit.
! EXIT-ACTION is nil or a function that is called with current buffer as
! argument.
! RETURN-TO-ALIST is an alist that for some of the windows displaying the
! current buffer, associate information on what to do with those windows.
! If ALL-WIN or the variable `view-exits-all-viewing-windows' is non-nil,
! then all windows on RETURN-TO-ALIST are restored to their old state.
! Otherwise only the selected window is affected (if it is on RETURN-TO-ALIST).
!
! Elements of RETURN-TO-ALIST have the format (WINDOW OLD-WINDOW . OLD-BUF-INFO).
! WINDOW is a window displaying the current buffer.
! OLD-WINDOW is nil or a window to select after viewing.
! OLD-BUF-INFO is information on what to do with WINDOW and is one of:
1) nil Do nothing.
2) t Delete WINDOW and, if it is the only window, its frame.
3) (OLD-BUF START POINT) Display buffer OLD-BUF with displayed text
starting at START and point at POINT in WINDOW.
4) quit-window Do `quit-window' in WINDOW.
! If one of the WINDOW in RETURN-TO-ALIST is the selected window and the
! corresponding OLD-WINDOW is a live window, then select OLD-WINDOW."
! (setq all-win
! (and return-to-alist (or all-win view-exits-all-viewing-windows)))
! (if view-mode ; Only do something if in view mode.
! (let* ((buffer (current-buffer))
! window notlost
! (sel-old (assq (selected-window) return-to-alist))
! (alist (cond
! (all-win ; Try to restore all windows.
! (append return-to-alist nil)) ; Copy.
! (sel-old ; Only selected window.
! (list sel-old))))
! (old-window (if sel-old (car (cdr sel-old)))))
! (if all-win ; Follow chains of old-windows.
! (let ((c (length alist)) a)
! (while (and (> c 0) ; Safety if mutually refering windows.
! (or (not (window-live-p old-window))
! (eq buffer (window-buffer old-window)))
! (setq a (assq old-window alist)))
! (setq c (1- c))
! (setq old-window (car (cdr a))))
! (if (or (zerop c) (not (window-live-p old-window)))
! (setq old-window (selected-window)))))
! (or view-no-disable-on-exit
! (view-mode-disable))
! (while alist ; Restore windows with info.
! (setq notlost nil)
! (if (and (window-live-p (setq window (car (car alist))))
(eq buffer (window-buffer window)))
! (let ((frame (window-frame window))
! (old-buf-info (cdr (cdr (car alist)))))
! (if all-win (select-window window))
! (cond
! ((and (consp old-buf-info) ; Case 3.
! (buffer-live-p (car old-buf-info)))
! (set-window-buffer window (car old-buf-info)) ; old-buf
! (set-window-start window (car (cdr old-buf-info)))
! (set-window-point window (car (cdr (cdr old-buf-info)))))
! ((eq old-buf-info 'quit-window)
! (quit-window)) ; Case 4.
! ((not (eq old-buf-info t)) nil) ; Not case 2, do nothing.
! ((not (one-window-p t)) (delete-window))
! ((not (eq frame (next-frame)))
! ;; Not the only frame, so can safely be removed.
! (if view-remove-frame-by-deleting
! (delete-frame frame)
! (setq notlost t) ; Keep the window. See below.
! (iconify-frame frame))))))
! ;; If a frame is removed by iconifying it, then the window is not
! ;; really lost. In this case we keep the entry in
! ;; view-return-to-alist so that if the user deiconifies the frame
! ;; and then press q, then the frame is iconified again.
! (unless notlost
(setq view-return-to-alist
! (delete (car alist) view-return-to-alist)))
! (setq alist (cdr alist)))
! (if (window-live-p old-window) ; still existing window
! (select-window old-window))
! (when exit-action
! (setq view-exit-action nil)
! (funcall exit-action buffer))
! (force-mode-line-update))))
\f
(defun View-exit ()
"Exit View mode but stay in current buffer."
--- 563,659 ----
\f
(defun view-mode-exit (&optional return-to-alist exit-action all-win)
"Exit View mode in various ways, depending on optional arguments.
! RETURN-TO-ALIST, EXIT-ACTION and ALL-WIN determine what to do
! after exit. EXIT-ACTION is nil or a function that is called with
! current buffer as argument.
!
! RETURN-TO-ALIST is an alist that, for some of the windows
! displaying the current buffer, maintains information on what to
! do when exiting those windows. If ALL-WIN is non-nil or the
! variable `view-exits-all-viewing-windows' is non-nil,
! view-mode-exit attempts to restore all windows showing the
! current buffer to their old state. Otherwise, only the selected
! window is affected (provided it is on RETURN-TO-ALIST).
!
! Elements of RETURN-TO-ALIST must have the format
! (WINDOW OLD-WINDOW . OLD-BUF-INFO) where
!
! WINDOW is a window displaying the current buffer and OLD-WINDOW
! is either nil or a window to select after viewing. OLD-BUF-INFO
! keeps information on what to do with WINDOW and may be one of:
1) nil Do nothing.
2) t Delete WINDOW and, if it is the only window, its frame.
3) (OLD-BUF START POINT) Display buffer OLD-BUF with displayed text
starting at START and point at POINT in WINDOW.
4) quit-window Do `quit-window' in WINDOW.
! If one of the WINDOWs in RETURN-TO-ALIST is the selected window
! and the corresponding OLD-WINDOW is a live window, then select
! OLD-WINDOW."
! (when view-mode ; Only do something if in view mode.
! (setq all-win
! (and return-to-alist
! (or all-win view-exits-all-viewing-windows)))
! (let* ((buffer (current-buffer))
! window notlost
! (sel-old (assq (selected-window) return-to-alist))
! (alist (cond
! (all-win ; Try to restore all windows.
! (append return-to-alist nil)) ; Copy.
! (sel-old ; Only selected window.
! (list sel-old))))
! (old-window (if sel-old (car (cdr sel-old)))))
! (if all-win ; Follow chains of old-windows.
! (let ((c (length alist)) a)
! (while (and (> c 0) ; Safety if mutually refering windows.
! (or (not (window-live-p old-window))
! (eq buffer (window-buffer old-window)))
! (setq a (assq old-window alist)))
! (setq c (1- c))
! (setq old-window (car (cdr a))))
! (if (or (zerop c) (not (window-live-p old-window)))
! (setq old-window (selected-window)))))
! (unless view-no-disable-on-exit
! (view-mode-disable))
! (while alist ; Restore windows with info.
! (setq notlost nil)
! (when (and (window-live-p (setq window (car (car alist))))
(eq buffer (window-buffer window)))
! (let ((frame (window-frame window))
! (old-buf-info (cdr (cdr (car alist)))))
! (if all-win (select-window window))
! (cond
! ((and (consp old-buf-info) ; Case 3.
! (buffer-live-p (car old-buf-info)))
! (set-window-buffer window (car old-buf-info)) ; old-buf
! (set-window-start window (car (cdr old-buf-info)))
! (set-window-point window (car (cdr (cdr old-buf-info)))))
! ((eq old-buf-info 'quit-window)
! (quit-window)) ; Case 4.
! ((not (eq old-buf-info t)) nil) ; Not case 2, do nothing.
! ((not (one-window-p t)) (delete-window))
! ((not (eq frame (next-frame)))
! ;; Not the only frame, so can safely be removed.
! (if view-remove-frame-by-deleting
! (delete-frame frame)
! (setq notlost t) ; Keep the window. See below.
! (iconify-frame frame))))))
! ;; If a frame is removed by iconifying it, the window is not
! ;; really lost. In this case we keep the entry in
! ;; `view-return-to-alist' so that if the user deiconifies the
! ;; frame and then hits q, the frame is iconified again.
! (unless notlost
! (with-current-buffer buffer
(setq view-return-to-alist
! (delete (car alist) view-return-to-alist))))
! (setq alist (cdr alist)))
! (when (window-live-p old-window)
! ;; old-window is still alive => select it.
! (select-window old-window))
! (when exit-action
! (setq view-exit-action nil)
! (funcall exit-action buffer))
! (force-mode-line-update))))
\f
(defun View-exit ()
"Exit View mode but stay in current buffer."
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: q doesn't always quit *Help*
[not found] <DNEMKBNJBGPAOPIJOOICIECPEAAA.drew.adams@oracle.com>
@ 2007-09-27 21:21 ` martin rudalics
2007-09-27 21:36 ` Drew Adams
0 siblings, 1 reply; 9+ messages in thread
From: martin rudalics @ 2007-09-27 21:21 UTC (permalink / raw)
To: Drew Adams; +Cc: Bug-Gnu-Emacs
> Thanks for working on this. I won't be able to spend a lot of time on this,
> but I'll try to help a bit. I guess you're saying that I should start with
> the source files that are in the distributed Emacs 22.1, and not with the
> source files in cvs - is that right?
The patch is against the latest CVS Emacs 22 aka EMACS_22_BASE.
> I assumed so, and I took a look wrt the bug I just reported. The problem is
> that the code seems complex, and there are apparently lots of different ways
> to interact with it. It's possible that a fix might take care of what I
> reported but either not fix other problems or even introduce new problems. I
> won't have the time to deal with all of that, but I will check whether your
> fix takes care of what I reported.
I haven't done anything on this for a month so _any_ feedback is mostly
welcome.
> [BTW, the fact that a fix to something like this needs to touch eight (!)
> Lisp files is aa suggestion that the View code is too complex and poorly
> designed, IMO. It's not a sure indication of poor design, but it is a hint.
> A (superficially simple) UI fix such as this should ideally be a local fix.]
The View code is not bad (most of my changes regard doc-strings only).
There are two basic problems: (1) The `with-output-to-temp-buffer' /
`print-help-return-message' combination relies on the latter to
_anticipate_ what `display-buffer' is going to do in the current
frame+window configuration. This is hardly feasible. (2) The
`view-exit-action' hack is a pain because it overrides the carefully
laid out design of View mode.
> I patched the Emacs 22.1 sources I have (from the distrib), but faces.el
> does not seem right.
Ignore it for the moment, all but help.el, help-mode.el, and view.el are
here to show how this should be implemented. One of them is sufficient
to demonstrate the behavior.
> The version in the distrib already has some of the
> changes your patch makes. For instance, it has no `face-normalize-spec', so
> that cannot be removed, and the later change that involves this has
> apparently already been applied in the distrib version. So the patch for
> faces.el confuses me. I applied the part of it that made sense. Similarly,
> there was a bit of view.el that had apparently already been changed before
> the distrib.
>
> [BTW, is there some way to apply a patch other than by hand (copy+paste)?
> I've been doing it by hand, and it takes quite a while (and is error
> prone).]
You don't use `ediff-patch-buffer/-file' e.g. from the Tools / Apply
Patch menu?
> I tried with the patched files: emacs -Q, then loaded each patched file. The
> bug is fixed. Thx.
>
> However, in my own Emacs environment, where I have pop-up-frames = t and
> where *Help* is a special-display frame, `q' iconifies the *Help* frame,
> which is awful. I want it to simply call `quit-window' (which in fact
> deletes the frame in my case).
`quit-window' deletes the frame iff it's a minibuffer-window - which
should not hold here - or it's a dedicated window - do you set that?
But I agree that the behavior you describe is logical and desirable (as
long as you never display anything else in that window). Hence, I have
to invent something here. Did you try this with `help-window-select'
customized?
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: q doesn't always quit *Help*
2007-09-27 21:21 ` q doesn't always quit *Help* martin rudalics
@ 2007-09-27 21:36 ` Drew Adams
2007-09-28 6:35 ` martin rudalics
0 siblings, 1 reply; 9+ messages in thread
From: Drew Adams @ 2007-09-27 21:36 UTC (permalink / raw)
To: martin rudalics; +Cc: Bug-Gnu-Emacs
> The patch is against the latest CVS Emacs 22 aka EMACS_22_BASE.
Ouch. You said 22.1, so I used that.
> You don't use `ediff-patch-buffer/-file' e.g. from the Tools / Apply
> Patch menu?
I will now.
> > I tried with the patched files: emacs -Q, then loaded each
> > patched file. The bug is fixed. Thx.
> >
> > However, in my own Emacs environment, where I have
> > pop-up-frames = t and where *Help* is a special-display
> > frame, `q' iconifies the *Help* frame, which is awful.
> > I want it to simply call `quit-window' (which in fact
> > deletes the frame in my case).
>
> `quit-window' deletes the frame iff it's a minibuffer-window - which
> should not hold here - or it's a dedicated window - do you set that?
As I said, it deletes the frame in my code. And yes, *Help* is probably also
a dedicated window for me - it is a special-display frame for me, in any
case.
> But I agree that the behavior you describe is logical and desirable (as
> long as you never display anything else in that window).
I don't the part in parentheses is needed - so what if you do at some time
display another buffer in that window?
> Hence, I have to invent something here. Did you try this with
> `help-window-select' customized?
No, I never heard of it. And I don't see it in Emacs 22.1 (or in 21 or 20),
which is what I use. What is it, and how might it help here?
Thx - Drew
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: q doesn't always quit *Help*
2007-09-27 21:36 ` Drew Adams
@ 2007-09-28 6:35 ` martin rudalics
2007-09-28 14:26 ` Drew Adams
0 siblings, 1 reply; 9+ messages in thread
From: martin rudalics @ 2007-09-28 6:35 UTC (permalink / raw)
To: Drew Adams; +Cc: Bug-Gnu-Emacs
>>`quit-window' deletes the frame iff it's a minibuffer-window - which
>>should not hold here - or it's a dedicated window - do you set that?
>
>
> As I said, it deletes the frame in my code. And yes, *Help* is probably also
> a dedicated window for me - it is a special-display frame for me, in any
> case.
If you change this manually I can't help you. Any solution I provide
here must rely on the standard settings. `view-mode-exit' has the
following code to cope with stand-alone frames:
((not (eq frame (next-frame)))
;; Not the only frame, so can safely be removed.
(if view-remove-frame-by-deleting
(delete-frame frame)
(setq notlost t) ; Keep the window. See below.
(iconify-frame frame))))))
Hence if your view-mode frame is not the only frame it should get
deleted provided you have set `view-remove-frame-by-deleting' to
non-nil. `quit-window' should never delete such frames. Did you
customize `view-remove-frame-by-deleting'?
>>But I agree that the behavior you describe is logical and desirable (as
>>long as you never display anything else in that window).
>
>
> I don't the part in parentheses is needed - so what if you do at some time
> display another buffer in that window?
If it's a view-mode buffer it should always rely on the _latest_
information established by `with-help-window'. This information should
be kept when you follow links or xrefs. For any other buffer "q"
hopefully has the effect the respective major mode assigns it.
>> Hence, I have to invent something here. Did you try this with
>>`help-window-select' customized?
>
>
> No, I never heard of it. And I don't see it in Emacs 22.1 (or in 21 or 20),
> which is what I use. What is it, and how might it help here?
That's the new option I wrote for help.el. With pop-up frames it
shouldn't make much difference I suppose.
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: q doesn't always quit *Help*
2007-09-28 6:35 ` martin rudalics
@ 2007-09-28 14:26 ` Drew Adams
2007-09-28 18:17 ` martin rudalics
0 siblings, 1 reply; 9+ messages in thread
From: Drew Adams @ 2007-09-28 14:26 UTC (permalink / raw)
To: martin rudalics; +Cc: Bug-Gnu-Emacs
> >>`quit-window' deletes the frame iff it's a minibuffer-window - which
> >>should not hold here - or it's a dedicated window - do you set that?
> >
> > As I said, it deletes the frame in my code. And yes, *Help* is
> > probably also a dedicated window for me - it is a special-display
> > frame for me, in any case.
>
> If you change this manually I can't help you. Any solution I provide
> here must rely on the standard settings.
Yes, of course.
My point was that `quit-window' (or equivalent) is correct and sufficient
here - for both me and users without non-nil `pop-up-frames'. That behavior
is all that is necessary, IMO. I don't see why anyone would (ever) need more
than to quit the window.
FWIW, in my case, `quit-window' is sufficient because I have modified
`delete-window' to delete the frame also if `one-window-p'. Beyond the
current bug, Emacs does not play well with frames. Fixing this bug should
not attempt to fix more than this bug, and the behavior of `quit-window' is
enough to fix this bug, IMO. To go beyond this bug, `delete-window' should
do what I just described - but that is a different deficiency.
> `view-mode-exit' has the
> following code to cope with stand-alone frames:
>
> ((not (eq frame (next-frame)))
> ;; Not the only frame, so can safely be removed.
> (if view-remove-frame-by-deleting
> (delete-frame frame)
> (setq notlost t) ; Keep the window.
> See below.
> (iconify-frame frame))))))
I do have `view-remove-frame-by-deleting' = t, yet *Help* was iconified
(after your fix). Sorry, I don't have a recipe now.
In any case, `q' in *Help* does various things (before your fix - I haven't
tested enough with the fix) in various contexts - (1) sometimes it does
nothing - no feedback, nada - useless; (2) sometimes it deletes the window
(& frame) - correct; (3) sometimes it iconifies the frame - awful. I assume
this variety is due to the complexity of the View mode code, but I don't
pretend to understand the causes. Besides the fact that #3 is awful and #1
is useless, it is not good that the behavior is variable.
> Hence if your view-mode frame is not the only frame it should get
> deleted provided you have set `view-remove-frame-by-deleting' to
> non-nil. `quit-window' should never delete such frames.
Don't worry about `quit-window' not deleting the frame - deleting the window
is suffient. With my own code it also deletes the frame, but don't worry
about that. Without my code, if other users eventually complain that the
frame too should be deleted, then the place to fix that is not in View
mode - it is by simply making `delete-window' delete the frame when
`one-window-p'.
> Did you customize `view-remove-frame-by-deleting'?
Yes, it is `t'.
> >>But I agree that the behavior you describe is logical and desirable (as
> >>long as you never display anything else in that window).
> >
> > I don't [think] the part in parentheses is needed - so what if you do
> > at some time display another buffer in that window?
>
> If it's a view-mode buffer it should always rely on the _latest_
> information established by `with-help-window'. This information should
> be kept when you follow links or xrefs. For any other buffer "q"
> hopefully has the effect the respective major mode assigns it.
OK, I don't pretend to follow the View-mode logic; I'm sure you're right.
In my ignorance, I think the whole approach of View mode for `q' since Emacs
22 is a mistake - trying to keep track of what series of events set up the
current context, to determine the smartest way to "quit".
To me, it doesn't make much sense for a function to try to keep track, in a
complex way, of how (it thinks) it was called and change its behavior in
complex ways accordingly. View mode worked fine in Emacs 20 and 21, IMO, and
now it is beyond hope. Call me a pessimist.
And I do admit to ignorance on this - I'm just relating my experience as a
user. I am not claiming I know how to design View mode so that it does TRT
in all contexts. It just feels terribly wrong when I look at the code.
> >> Hence, I have to invent something here. Did you try this with
> >>`help-window-select' customized?
> >
> > No, I never heard of it. And I don't see it in Emacs 22.1 (or
> > in 21 or 20), which is what I use. What is it, and how might
> > it help here?
>
> That's the new option I wrote for help.el. With pop-up frames it
> shouldn't make much difference I suppose.
Was it in the patch? I didn't notice it.
Anyway, thanks for fixing this bug. For the rest, we shall see. If I get a
recipe for other problems I'll let you know. My general wish is that someone
revamp the View-mode code to simplify it and remove the klunky "cleverness".
I think it should not try to have 18 zillion different behaviors, depending
on how it thinks it might have been called and what it thinks the user might
be intending.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: q doesn't always quit *Help*
2007-09-28 14:26 ` Drew Adams
@ 2007-09-28 18:17 ` martin rudalics
2007-09-28 19:17 ` Drew Adams
0 siblings, 1 reply; 9+ messages in thread
From: martin rudalics @ 2007-09-28 18:17 UTC (permalink / raw)
To: Drew Adams; +Cc: Bug-Gnu-Emacs
> My point was that `quit-window' (or equivalent) is correct and sufficient
> here - for both me and users without non-nil `pop-up-frames'. That behavior
> is all that is necessary, IMO. I don't see why anyone would (ever) need more
> than to quit the window.
`quit-window' deletes the frame iff
(and (or (window-minibuffer-p) (window-dedicated-p window))
holds. Hence to get rid of the frame `quit-window' is not sufficient in
`view-mode'.
> FWIW, in my case, `quit-window' is sufficient because I have modified
> `delete-window' to delete the frame also if `one-window-p'. Beyond the
> current bug, Emacs does not play well with frames. Fixing this bug should
> not attempt to fix more than this bug, and the behavior of `quit-window' is
> enough to fix this bug, IMO. To go beyond this bug, `delete-window' should
> do what I just described - but that is a different deficiency.
`delete-window' is a primitive function. I doubt you modified it. Did
you advise it or do you run a `window-configuration-change-hook'?
>>`view-mode-exit' has the
>>following code to cope with stand-alone frames:
>>
>> ((not (eq frame (next-frame)))
>> ;; Not the only frame, so can safely be removed.
>> (if view-remove-frame-by-deleting
>> (delete-frame frame)
>> (setq notlost t) ; Keep the window.
>>See below.
>> (iconify-frame frame))))))
>
>
> I do have `view-remove-frame-by-deleting' = t, yet *Help* was iconified
> (after your fix). Sorry, I don't have a recipe now.
There is only one single instance of `iconify-frame' in the code of
view-mode, the one cited above. Hence the only explanation for getting
an iconfied frame is that `view-remove-frame-by-deleting' was nil.
> In any case, `q' in *Help* does various things (before your fix - I haven't
> tested enough with the fix) in various contexts - (1) sometimes it does
> nothing - no feedback, nada - useless; (2) sometimes it deletes the window
> (& frame) - correct; (3) sometimes it iconifies the frame - awful. I assume
> this variety is due to the complexity of the View mode code, but I don't
> pretend to understand the causes. Besides the fact that #3 is awful and #1
> is useless, it is not good that the behavior is variable.
`q' has to cope with split windows as well as with the single
frame/window case, hence the solution is necessarily more complex.
Anyway (1) should not occur any more. I fixed that by making
`view-exit-action' bury the buffer in help-mode. (2) should work if
`pop-up-frames' and `view-remove-frame-by-deleting' are non-nil. (3)
should happen iff `view-remove-frame-by-deleting' is nil. If you
observe deviant behavior please tell me.
> In my ignorance, I think the whole approach of View mode for `q' since Emacs
> 22 is a mistake - trying to keep track of what series of events set up the
> current context, to determine the smartest way to "quit".
>
> To me, it doesn't make much sense for a function to try to keep track, in a
> complex way, of how (it thinks) it was called and change its behavior in
> complex ways accordingly. View mode worked fine in Emacs 20 and 21, IMO, and
> now it is beyond hope. Call me a pessimist.
The problem is not in view-mode as I explained earlier. view-mode
hardly changed from Emacs 21 to Emacs 22. The problem is with the
help-mode interface.
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: q doesn't always quit *Help*
2007-09-28 18:17 ` martin rudalics
@ 2007-09-28 19:17 ` Drew Adams
2007-09-29 9:05 ` martin rudalics
0 siblings, 1 reply; 9+ messages in thread
From: Drew Adams @ 2007-09-28 19:17 UTC (permalink / raw)
To: martin rudalics; +Cc: Bug-Gnu-Emacs
> > My point was that `quit-window' (or equivalent) is correct and
> > sufficient here - for both me and users without non-nil
> > `pop-up-frames'. That behavior is all that is necessary, IMO.
> > I don't see why anyone would (ever) need more than to quit the
> > window.
>
> `quit-window' deletes the frame iff
> (and (or (window-minibuffer-p) (window-dedicated-p window))
> holds. Hence to get rid of the frame `quit-window' is not
> sufficient in `view-mode'.
I understand that (and you mentioned it before). See below. What I am saying
is that it will delete the window, and that is sufficient.
Getting a `one-window-p' frame to be deleted when its window is deleted
should not be the job of `quit-window' or View-mode quitting, IMO. It should
be the job of `delete-window'.
I fixed `delete-window' to do that for myself, and I think it should be
fixed to do that in Emacs also. But that is not part of this bug.
> > FWIW, in my case, `quit-window' is sufficient because I have modified
> > `delete-window' to delete the frame also if `one-window-p'. Beyond the
> > current bug, Emacs does not play well with frames. Fixing this
> > bug should not attempt to fix more than this bug, and the behavior of
> > `quit-window' is enough to fix this bug, IMO. To go beyond this bug,
> > `delete-window' should do what I just described - but that is a
> > different deficiency.
>
> `delete-window' is a primitive function. I doubt you modified it. Did
> you advise it or do you run a `window-configuration-change-hook'?
It really doesn't matter how I fixed it for myself. I'm not proposing what I
did for anyone else. FWIW, I just redefined it to delete the frame if
`one-window-p' or else call the original (built-in) definition. No, that is
not the way it should be fixed in Emacs, but it works for me.
(or (fboundp 'old-delete-window)
(fset 'old-delete-window (symbol-function 'delete-window)))
(defun delete-window (&optional window)
"Remove WINDOW from the display. Default is `selected-window'.
If WINDOW is the only one in its frame, then `delete-frame' too."
(interactive)
(setq window (or window (selected-window)))
(select-window window)
(if (one-window-p t)
(delete-frame)
(old-delete-window (selected-window))))
> >>`view-mode-exit' has the
> >>following code to cope with stand-alone frames:
> >>
> >> ((not (eq frame (next-frame)))
> >> ;; Not the only frame, so can safely be removed.
> >> (if view-remove-frame-by-deleting
> >> (delete-frame frame)
> >> (setq notlost t) ; Keep the window.
> >>See below.
> >> (iconify-frame frame))))))
> >
> >
> > I do have `view-remove-frame-by-deleting' = t, yet *Help* was iconified
> > (after your fix). Sorry, I don't have a recipe now.
>
> There is only one single instance of `iconify-frame' in the code of
> view-mode, the one cited above. Hence the only explanation for getting
> an iconfied frame is that `view-remove-frame-by-deleting' was nil.
I do have `view-remove-frame-by-deleting' = t. The frame was iconified. This
was after I applied your patch. Perhaps it is not in the code of view-mode
that `q' caused iconification? I don't know. All I can say is that it
happened.
I have not sent a recipe to reproduce it, so don't worry about this now.
> > In any case, `q' in *Help* does various things (before your
> > fix - I haven't tested enough with the fix) in various
> > contexts - (1) sometimes it does nothing - no feedback, nada
> > - useless; (2) sometimes it deletes the window
> > (& frame) - correct; (3) sometimes it iconifies the frame -
> > awful. I assume this variety is due to the complexity of the
> > View mode code, but I don't pretend to understand the causes.
> > Besides the fact that #3 is awful and #1 is useless, it is
> > not good that the behavior is variable.
>
> `q' has to cope with split windows as well as with the single
> frame/window case, hence the solution is necessarily more complex.
As I say, I don't pretend to know all that it is trying to deal with.
As far as the single frame case is concerned, as I said, I think that it
should not be up to view-mode to worry about that - that should be what
`delete-window' does. Whether it is appropriate to delete a `one-window-p'
frame when code tries to delete the window is not specific to view-mode.
Again, however, I am ignorant of the complexities and needs of view-mode.
> Anyway (1) should not occur any more. I fixed that by making
> `view-exit-action' bury the buffer in help-mode.
I haven't tried the new code much, but I've found that `bury-buffer' is
usually the worst thing for my one-frame-per-buffer-by-default setup. It
almost never DTRT for me. Usually just deleting the frame or killing the
buffer is more appropriate in my context. But don't worry about this now. If
I find a specific problem I'll report it specifically.
> (2) should work if
> `pop-up-frames' and `view-remove-frame-by-deleting' are non-nil.
Don't forget that it is not enough to test `pop-up-frames'. There are other
reasons that a user might systematically display *Help* in a separate frame.
Special-display buffers, for instance. The only thing you can count on
`pop-up-frames' to indicate, wrt the user's intention, is whether
`display-buffer' should systematically use a separate frame - nothing more.
A nil value does not imply that *Help* (or whatever other buffer) is not to
be displayed in its own frame.
FWIW, I've found that the first thing that a library author does, when I
inform him that his code does not work with one-frame-per-buffer-by-default,
is to change the code to test `pop-up-frames'. It's not so simple.
IMO, the proper thing to test is not `pop-up-frames' but `one-window-p'.
Now, maybe some users don't want the frame to be always be deleted if
`one-window-p', and maybe there should therefore be some other option to
indicate the user's preference. If so, it should not be limited to view-mode
(e.g. `view-remove-frame-by-deleting'). It has nothing to do with view-mode.
Perhaps we need an option `delete-window-deletes-single-window-frame'; I
don't know. In any case, this is about `delete-window', not about
`display-buffer' (i.e. `pop-up-frames').
> (3) should happen iff `view-remove-frame-by-deleting' is nil.
> If you observe deviant behavior please tell me.
>
> > In my ignorance, I think the whole approach of View mode for
> > `q' since Emacs 22 is a mistake - trying to keep track of what
> > series of events set up the current context, to determine the
> > smartest way to "quit".
> >
> > To me, it doesn't make much sense for a function to try to
> > keep track, in a complex way, of how (it thinks) it was called
> > and change its behavior in complex ways accordingly. View mode
> > worked fine in Emacs 20 and 21, IMO, and
> > now it is beyond hope. Call me a pessimist.
>
> The problem is not in view-mode as I explained earlier. view-mode
> hardly changed from Emacs 21 to Emacs 22. The problem is with the
> help-mode interface.
OK. As I said, I'm pretty ignorant in this regard.
Whenever I tried to debug this in the past, to follow what was happening, it
was in the view-mode code that I got lost and tangled in the undergrowth.
For one thing, there is a plethora of different view-mode exit functions
(View-exit, View-exit-and-edit, View-leave, View-kill-and-leave, View-quit,
View-quit-all). For another thing, the code apparently tries to keep track
of the context in which it was called, and it tries to DTRT based on that
context. The latter, in particular, is bound to be tricky. If, in the
meantime, some of that original context no longer makes sense (e.g. deleted
windows), then it needs to try to adjust to the changed context, and so on.
To me, both of those things (multiple ways to exit and trying to handle
different calling contexts) raise a red flag that signals a probable
complicated mess. No, I don't know that it is a mess; it just seems that
way. I was overwhelmed by what I saw, and I gave up. Mea culpa.
Yes, IIRC, it was in the help-mode code that the view-mode code was called
and the calling context was recorded, and that is perhaps the culprit, not
view-mode itself.
Thanks again for having fixed this bug.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: q doesn't always quit *Help*
2007-09-28 19:17 ` Drew Adams
@ 2007-09-29 9:05 ` martin rudalics
0 siblings, 0 replies; 9+ messages in thread
From: martin rudalics @ 2007-09-29 9:05 UTC (permalink / raw)
To: Drew Adams; +Cc: Bug-Gnu-Emacs
> Getting a `one-window-p' frame to be deleted when its window is deleted
> should not be the job of `quit-window' or View-mode quitting, IMO. It should
> be the job of `delete-window'.
>
> I fixed `delete-window' to do that for myself, and I think it should be
> fixed to do that in Emacs also. But that is not part of this bug.
We can't change the standard semantics of `delete-window'. We could
provide a `delete-window-deletes-frame-if-there-is-only-one-window-left'
option and delete the frame if it has one window only and this option is
non-nil.
> (or (fboundp 'old-delete-window)
> (fset 'old-delete-window (symbol-function 'delete-window)))
>
> (defun delete-window (&optional window)
That's cannibalism! Mr. Adams ...
> As far as the single frame case is concerned, as I said, I think that it
> should not be up to view-mode to worry about that - that should be what
> `delete-window' does. Whether it is appropriate to delete a `one-window-p'
> frame when code tries to delete the window is not specific to view-mode.
>
> Again, however, I am ignorant of the complexities and needs of view-mode.
>
>
>>Anyway (1) should not occur any more. I fixed that by making
>>`view-exit-action' bury the buffer in help-mode.
>
>
> I haven't tried the new code much, but I've found that `bury-buffer' is
> usually the worst thing for my one-frame-per-buffer-by-default setup. It
> almost never DTRT for me. Usually just deleting the frame or killing the
> buffer is more appropriate in my context. But don't worry about this now. If
> I find a specific problem I'll report it specifically.
Earlier you complained "sometimes it does nothing - no feedback, nada -
useless" hence burying the buffer should be an improvement. Why is
`kill-buffer' better than `bury-buffer' for the *Help* buffer?
>>(2) should work if
>>`pop-up-frames' and `view-remove-frame-by-deleting' are non-nil.
>
>
> Don't forget that it is not enough to test `pop-up-frames'. There are other
> reasons that a user might systematically display *Help* in a separate frame.
> Special-display buffers, for instance. The only thing you can count on
> `pop-up-frames' to indicate, wrt the user's intention, is whether
> `display-buffer' should systematically use a separate frame - nothing more.
> A nil value does not imply that *Help* (or whatever other buffer) is not to
> be displayed in its own frame.
>
> FWIW, I've found that the first thing that a library author does, when I
> inform him that his code does not work with one-frame-per-buffer-by-default,
> is to change the code to test `pop-up-frames'. It's not so simple.
IMHO `pop-up-frames' should be tested _exclusively_ in `display-buffer'.
That's one reason why I want to deprecate `print-help-return-message'.
> IMO, the proper thing to test is not `pop-up-frames' but `one-window-p'.
`view-mode-exit' should do that: The frame-handling code is executed
only if `one-window-p' holds:
((not (one-window-p t)) (delete-window))
((not (eq frame (next-frame)))
;; Not the only frame, so can safely be removed.
(if view-remove-frame-by-deleting
(delete-frame frame)
(setq notlost t) ; Keep the window. See below.
(iconify-frame frame))))))
> Now, maybe some users don't want the frame to be always be deleted if
> `one-window-p', and maybe there should therefore be some other option to
> indicate the user's preference. If so, it should not be limited to view-mode
> (e.g. `view-remove-frame-by-deleting'). It has nothing to do with view-mode.
> Perhaps we need an option `delete-window-deletes-single-window-frame'; I
> don't know. In any case, this is about `delete-window', not about
> `display-buffer' (i.e. `pop-up-frames').
That's precisely what `view-remove-frame-by-deleting' is for, as far as
view-mode is concerned. But I wouldn't oppose adding such an option for
`delete-window'. Note, however, that `quit-window' has become the
synonym for "quitting" in a number of modes. Hence, maybe an option
like `quit-window-always-kills-solitary-frame' is more appropriate.
> Whenever I tried to debug this in the past, to follow what was happening, it
> was in the view-mode code that I got lost and tangled in the undergrowth.
> For one thing, there is a plethora of different view-mode exit functions
> (View-exit, View-exit-and-edit, View-leave, View-kill-and-leave, View-quit,
> View-quit-all). For another thing, the code apparently tries to keep track
> of the context in which it was called, and it tries to DTRT based on that
> context. The latter, in particular, is bound to be tricky. If, in the
> meantime, some of that original context no longer makes sense (e.g. deleted
> windows), then it needs to try to adjust to the changed context, and so on.
>
> To me, both of those things (multiple ways to exit and trying to handle
> different calling contexts) raise a red flag that signals a probable
> complicated mess. No, I don't know that it is a mess; it just seems that
> way. I was overwhelmed by what I saw, and I gave up. Mea culpa.
Most of the exit functions you mention are creeping featurism. The fact
that they are here should teach us not to install such functions in the
future. Once they're in Emacs it's hard to get rid of them.
Restoring the context where a help function was called _is_ convenient
when you have, for example, split a window to show two distinct parts of
the same buffer and you don't want to pop-up a new frame. In this case
you should be able to temporarily view *Help* in one of these windows
and have quitting restore the previous state.
I can't change view-mode much. It's already used by too many parts of
Emacs. I can only try to make it behave better with help-mode.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2007-09-29 9:05 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
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[not found] <DNEMKBNJBGPAOPIJOOICIECPEAAA.drew.adams@oracle.com>
2007-09-27 21:21 ` q doesn't always quit *Help* martin rudalics
2007-09-27 21:36 ` Drew Adams
2007-09-28 6:35 ` martin rudalics
2007-09-28 14:26 ` Drew Adams
2007-09-28 18:17 ` martin rudalics
2007-09-28 19:17 ` Drew Adams
2007-09-29 9:05 ` martin rudalics
2007-09-26 18:54 Drew Adams
2007-09-27 9:05 ` martin rudalics
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