bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

[-- Attachment #1: Type: text/plain, Size: 459 bytes --]


$ emacs -Q some.pdf

C-x r m RET
C-x k RET
C-x r b some.pdf RET

Debugger entered--Lisp error: (wrong-type-argument listp t)
  image-mode-winprops(nil)

The reason is that the buffer is not yet displayed, when
doc-view-bookmark-jump tries to change the page.  This results in, for
obscure reasons, trying to change the page in which ever window is
currently selected.  Solution: Defer changing the page after
bookmark--jump-via has displayed the page.

-ap


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: Patch --]
[-- Type: text/x-diff, Size: 1433 bytes --]

=== modified file 'lisp/ChangeLog'
*** lisp/ChangeLog	2013-12-08 09:18:55 +0000
--- lisp/ChangeLog	2013-12-08 16:11:24 +0000
***************
*** 1,3 ****
--- 1,8 ----
+ 2013-12-08  Andreas Politz <politza@fh-trier.de>
+ 
+ 	* doc-view.el (doc-view-bookmark-jump): Wait for the window to be
+ 	displayed before changing the page.
+ 
  2013-12-08  Leo Liu  <sdl.web@gmail.com>
  
  	* progmodes/flymake.el (flymake-highlight-line): Re-write.

=== modified file 'lisp/doc-view.el'
*** lisp/doc-view.el	2013-11-28 22:43:09 +0000
--- lisp/doc-view.el	2013-12-08 16:11:34 +0000
***************
*** 1870,1879 ****
      (let ((page (bookmark-prop-get bmk 'page)))
        (when (not (eq major-mode 'doc-view-mode))
          (doc-view-toggle-display))
!       (with-selected-window
!        (or (get-buffer-window (current-buffer) 0)
! 	   (selected-window))
!        (doc-view-goto-page page)))))
  
  
  (provide 'doc-view)
--- 1870,1882 ----
      (let ((page (bookmark-prop-get bmk 'page)))
        (when (not (eq major-mode 'doc-view-mode))
          (doc-view-toggle-display))
!       (run-with-idle-timer 0 nil
!         (lambda (buffer page)
!           (when (and (buffer-live-p buffer)
!                      (window-live-p (get-buffer-window buffer 0)))
!             (with-selected-window (get-buffer-window buffer 0)
!               (doc-view-goto-page page))))
!         (current-buffer) page))))
  
  
  (provide 'doc-view)


[-- Attachment #3: Backtrace --]
[-- Type: application/octet-stream, Size: 4505 bytes --]

Debugger entered--Lisp error: (wrong-type-argument listp t)
  image-mode-winprops(nil)
  image-mode-window-put(page 0 nil)
  (progn (image-mode-window-put (quote page) page nil) (image-mode-window-put (quote info) (concat (propertize (format "Page %d of %d." page len) (quote face) (quote bold)) (if doc-view--current-converter-processes " (still converting...)\n" "\n") (if (and doc-view--current-search-matches (assq page doc-view--current-search-matches)) (progn (concat (propertize "Search matches:\n" (quote face) (quote bold)) (let (...) (let ... ...) contexts))))) nil))
  (let ((len (doc-view-last-page-number))) (if (< page 1) (setq page 1) (if (and (> page len) (null doc-view--current-converter-processes)) (progn (setq page len)))) (force-mode-line-update) (progn (image-mode-window-put (quote page) page nil) (image-mode-window-put (quote info) (concat (propertize (format "Page %d of %d." page len) (quote face) (quote bold)) (if doc-view--current-converter-processes " (still converting...)\n" "\n") (if (and doc-view--current-search-matches (assq page doc-view--current-search-matches)) (progn (concat (propertize "Search matches:\n" ... ...) (let ... ... contexts))))) nil)) (let ((file (expand-file-name (format doc-view--image-file-pattern page) (doc-view--current-cache-dir)))) (doc-view-insert-image file :pointer (quote arrow)) (if (and (not (file-exists-p file)) doc-view--current-converter-processes) (progn (funcall doc-view-single-page-converter-function doc-view--buffer-file-name file page (let ((win ...)) (function (lambda nil ...))))))) (overlay-put (image-mode-window-get (quote overlay)) (quote help-echo) (image-mode-window-get (quote info))))
  doc-view-goto-page(1)
  (progn (select-window (car save-selected-window--state) (quote norecord)) (doc-view-goto-page page))
  (unwind-protect (progn (select-window (car save-selected-window--state) (quote norecord)) (doc-view-goto-page page)) (internal--after-with-selected-window save-selected-window--state))
  (save-current-buffer (unwind-protect (progn (select-window (car save-selected-window--state) (quote norecord)) (doc-view-goto-page page)) (internal--after-with-selected-window save-selected-window--state)))
  (let ((save-selected-window--state (internal--before-with-selected-window (or (get-buffer-window (current-buffer) 0) (selected-window))))) (save-current-buffer (unwind-protect (progn (select-window (car save-selected-window--state) (quote norecord)) (doc-view-goto-page page)) (internal--after-with-selected-window save-selected-window--state))))
  (let ((page (bookmark-prop-get bmk (quote page)))) (if (not (eq major-mode (quote doc-view-mode))) (progn (doc-view-toggle-display))) (let ((save-selected-window--state (internal--before-with-selected-window (or (get-buffer-window (current-buffer) 0) (selected-window))))) (save-current-buffer (unwind-protect (progn (select-window (car save-selected-window--state) (quote norecord)) (doc-view-goto-page page)) (internal--after-with-selected-window save-selected-window--state)))))
  (prog1 (bookmark-default-handler bmk) (let ((page (bookmark-prop-get bmk (quote page)))) (if (not (eq major-mode (quote doc-view-mode))) (progn (doc-view-toggle-display))) (let ((save-selected-window--state (internal--before-with-selected-window (or (get-buffer-window ... 0) (selected-window))))) (save-current-buffer (unwind-protect (progn (select-window (car save-selected-window--state) (quote norecord)) (doc-view-goto-page page)) (internal--after-with-selected-window save-selected-window--state))))))
  doc-view-bookmark-jump(("some.pdf" (filename . "/tmp/some.pdf") (front-context-string . "%PDF-1.3\n%\307\354\217\242\n5") (rear-context-string) (position . 1) (page . 1) (handler . doc-view-bookmark-jump)))
  funcall(doc-view-bookmark-jump ("some.pdf" (filename . "/tmp/some.pdf") (front-context-string . "%PDF-1.3\n%\307\354\217\242\n5") (rear-context-string) (position . 1) (page . 1) (handler . doc-view-bookmark-jump)))
  (condition-case err (funcall (or (bookmark-get-handler bookmark-name-or-record) (quote bookmark-default-handler)) (bookmark-get-bookmark bookmark-name-or-record)) (bookmark-error-no-filename (if (stringp bookmark-name-or-record) (progn (let ((file (bookmark-get-filename bookmark-name-or-record))) (if file (progn (let ... ... ...))))))))
  bookmark-handle-bookmark("some.pdf")
  bookmark--jump-via("some.pdf" switch-to-buffer)
  bookmark-jump("some.pdf")
  call-interactively(bookmark-jump nil nil)
  command-execute(bookmark-jump)

[-- Attachment #4: Type: text/plain, Size: 22675 bytes --]





In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.20.1)
 of 2013-11-23 on luca
Bzr revision: 114436 politza@fh-trier.de-20131123014125-vrsnab4s0vsaw7w6
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
System Description:	Debian GNU/Linux 6.0.8 (squeeze)

Configured using:
 `configure -C'

Important settings:
  value of $LC_COLLATE: C
  value of $LC_MESSAGES: C
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Dired -lAS

Minor modes in effect:
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  ewm-mode-line-mode: t
  ewm-mode: t
  ewm-compat-mode: t
  ewm-compat-calendar-mode: t
  ewm-compat-calc-mode: t
  diff-auto-refine-mode: t
  TeX-source-correlate-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-decoration-mode: t
  global-semantic-idle-scheduler-mode: t
  semantic-mode: t
  desktop-save-mode: t
  mimo-mode: t
  pc-completion-mode: t
  ispell-track-input-method: t
  doc-view-tidy-cache-mode: t
  recentf-mode: t
  show-paren-mode: t
  window-numbering-mode: t
  shell-dirtrack-mode: t
  scroll-other-window-mode: t
  savehist-mode: t
  eldoc-in-minibuffer-mode: t
  ekey-mode: t
  winner-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-b p a <return> M-n M-p C-c C-a C-p C-e <return> M-p 
C-c C-a C-l C-u C-c C-a C-p C-p C-p C-x o C-p C-p C-M-f 
C-M-b C-M-SPC M-w C-x o C-x C-q M-f M-f M-b M-f M-f 
C-; b n C-c C-a C-p C-e l i s p / C h <tab> <return> 
C-x o C-l C-SPC C-n C-n C-n C-n C-n C-w M-< C-y C-s 
d o c - v i <return> C-l C-s C-s C-s <return> C-l C-s 
C-s C-s C-g C-s d o c - v i e w - b o C-s <return> 
C-l M-< C-l C-/ C-x k <return> C-s C-g M-< C-x C-s 
C-x C-f d o c <tab> <return> C-x o M-n C-c C-a C-x 
o C-l C-x C-s C-u C-x v D <return> <return> C-x o C-u 
C-g C-x v C-g C-x C-v C-g C-x v D M-n M-p C-c C-c C-n 
C-n C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p C-p C-p 
C-p C-p C-M-s C-q <tab> C-s C-s C-g C-x o C-M-a C-, 
L b o o k m <tab> <return> C-x v l C-s b o o k C-s 
C-s C-s C-s C-s C-s C-s <return> C-l C-s C-s C-s C-s 
C-s C-s C-s <return> C-l C-l C-s C-s <return> C-x o 
C-x b <return> C-x b d i f <return> C-x C-w / t m p 
/ d o <tab> <return> y y C-x b d o C-s C-k C-g g C-x 
b d o c C-r C-g C-x C-j C-0 w C-x b <return> C-x b 
e x <return> C-x C-j C-u s S <return> M-> C-p C-p C-p 
C / t m p / f o o . p d f <return> M-x r e p o r <tab> 
b u g <return>

Recent messages:
Saving file /tmp/doc-view.patch...
Wrote /tmp/doc-view.patch
Quit
Mark set
Quit
Directory has changed on disk; type g to update Dired
/tmp/doc-view.patch
Mark set
Copy: 1 of 1
Copy: 1 file

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bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Andreas Politz <politza@hochschule-trier.de> writes:

> $ emacs -Q some.pdf
>
> C-x r m RET
> C-x k RET
> C-x r b some.pdf RET
>
> Debugger entered--Lisp error: (wrong-type-argument listp t)
>   image-mode-winprops(nil)

Indeed.

> The reason is that the buffer is not yet displayed, when
> doc-view-bookmark-jump tries to change the page.  This results in, for
> obscure reasons, trying to change the page in which ever window is
> currently selected.  Solution: Defer changing the page after
> bookmark--jump-via has displayed the page.

Here's a simpler patch which does also seem to fix the problem by simply
using find-file instead of bookmark's default handler without requiring
a timer.

--8<---------------cut here---------------start------------->8---
=== modified file 'lisp/doc-view.el'
--- lisp/doc-view.el	2013-01-01 09:11:05 +0000
+++ lisp/doc-view.el	2013-12-09 08:55:30 +0000
@@ -1653,14 +1653,11 @@
 (defun doc-view-bookmark-jump (bmk)
   ;; This implements the `handler' function interface for record type
   ;; returned by `doc-view-bookmark-make-record', which see.
-  (prog1 (bookmark-default-handler bmk)
+  (prog1 (find-file (bookmark-get-filename bmk))
     (let ((page (bookmark-prop-get bmk 'page)))
       (when (not (eq major-mode 'doc-view-mode))
-        (doc-view-toggle-display))
-      (with-selected-window
-       (or (get-buffer-window (current-buffer) 0)
-	   (selected-window))
-       (doc-view-goto-page page)))))
+	(doc-view-toggle-display))
+      (doc-view-goto-page page))))
--8<---------------cut here---------------end--------------->8---

Could you check if that also fixes the issue for you?

And a question concerning the procedure: since this is a fix for a bug
relative to emacs 23, should I commit it on the emacs-24 branch?

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

Tassilo Horn <tsdh@gnu.org> writes:

> Here's a simpler patch which does also seem to fix the problem by simply
> using find-file instead of bookmark's default handler without requiring
> a timer.

The timer surely is ugly. But the code displaying the buffer runs after
the handler returns and using find-file in it may result in displaying
the buffer twice, I guess. E.g. when using bookmark-jump-other-window.

-ap

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Andreas Politz <politza@hochschule-trier.de> writes:

>> Here's a simpler patch which does also seem to fix the problem by
>> simply using find-file instead of bookmark's default handler without
>> requiring a timer.
>
> The timer surely is ugly. But the code displaying the buffer runs after
> the handler returns and using find-file in it may result in displaying
> the buffer twice, I guess. E.g. when using bookmark-jump-other-window.

Indeed, you are right.

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Glenn Morris]

Tassilo Horn wrote:

> And a question concerning the procedure: since this is a fix for a bug
> relative to emacs 23, should I commit it on the emacs-24 branch?

If you want to do that and are sure the fix is correct, go ahead.
But feel equally free to just commit to trunk instead, since that
emacs-24 branch will not be used for any more releases.

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Glenn Morris <rgm@gnu.org> writes:

>> And a question concerning the procedure: since this is a fix for a
>> bug relative to emacs 23, should I commit it on the emacs-24 branch?
>
> If you want to do that and are sure the fix is correct, go ahead.  But
> feel equally free to just commit to trunk instead, since that emacs-24
> branch will not be used for any more releases.

Ah, ok.  I've thought 24.4 would be made from the emacs-24 branch, and
then I'd definitively like to have the fix in there.

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Stefan Monnier]

> The reason is that the buffer is not yet displayed, when
> doc-view-bookmark-jump tries to change the page.  This results in, for
> obscure reasons, trying to change the page in which ever window is
> currently selected.  Solution: Defer changing the page after
> bookmark--jump-via has displayed the page.

Thanks for the report.  And thanks for the patch, tho it shouldn't be
installed as is: using a timer is not a good solution.  The code is
already equipped to handle non-displayed buffers (it keeps track of the
"default current page" which is later used when/if the buffer gets
displayed in a window).
Apparently, there's a bug in that code, or a bad interaction with that
code and something that happens when you use a bookmark to access
the document.


        Stefan

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>> The reason is that the buffer is not yet displayed, when
>> doc-view-bookmark-jump tries to change the page.  This results in,
>> for obscure reasons, trying to change the page in which ever window
>> is currently selected.  Solution: Defer changing the page after
>> bookmark--jump-via has displayed the page.
>
> Thanks for the report.  And thanks for the patch, tho it shouldn't be
> installed as is: using a timer is not a good solution.  The code is
> already equipped to handle non-displayed buffers (it keeps track of
> the "default current page" which is later used when/if the buffer gets
> displayed in a window).

Yes, but I think that doesn't suffice.  The problem with bookmarks is
that the display window function is run after the bookmark handler, so
we have no clue in which window the bookmarked page is going to be
shown.  It may be the current window, an existing other window (which
might already show another page of the doc and thus already has an entry
in `image-mode-winprops-alist'), or a completely new window.

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

Tassilo Horn <tsdh@gnu.org> writes:

> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>> The code is already equipped to handle non-displayed buffers (it
>> keeps track of the "default current page" which is later used when/if
>> the buffer gets displayed in a window).

I see.  So the problem is the

  (with-selected-window (or ... (selected-window))),

which most of the times makes the wrong buffer current (having
image-mode-winprops-alist eq t).
>
> Yes, but I think that doesn't suffice.  The problem with bookmarks is
> that the display window function is run after the bookmark handler, so
> we have no clue in which window the bookmarked page is going to be
> shown.  [...]

What about setting an additional property for the page in
image-mode-winprops-alist and removing it later in
doc-view-new-window-function ?

-ap

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

Andreas Politz <politza@hochschule-trier.de> writes:

> What about setting an additional property [...]

Never mind this shot from the hip.

-ap

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

Tassilo Horn <tsdh@gnu.org> writes:

> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>
>> The code is already equipped to handle non-displayed buffers (it
>> keeps track of the "default current page" which is later used when/if
>> the buffer gets displayed in a window).

Where is this page read and gone to ? doc-view-new-window-function
at most switches to the first page and this

(with-current-buffer (find-file-noselect "some.pdf")
  (doc-view-goto-page 2)
  (pop-to-buffer (current-buffer)))

also displays the first page. Is this a mistake in this function,
i.e. shouldn't it read the winprop page ?

-ap

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Andreas Politz <politza@hochschule-trier.de> writes:

>>> The code is already equipped to handle non-displayed buffers (it
>>> keeps track of the "default current page" which is later used
>>> when/if the buffer gets displayed in a window).
>
> Where is this page read and gone to ? doc-view-new-window-function at
> most switches to the first page

Comment in the `message' in the first line.  You'll see that it's called
two times (once with t and once with a window in (car winprops)) if the
buffer hasn't been shown in some window already.

> and this
>
> (with-current-buffer (find-file-noselect "some.pdf")
>   (doc-view-goto-page 2)
>   (pop-to-buffer (current-buffer)))
>
> also displays the first page.

No, if some.pdf hasn't been open yet, it'll show page 2.  In that case,
`image-mode-winprops-alist' default entry will look like this:

 (t
  (info .
	#("Page 2 of 6.\n" 0 12
	  (face bold)))
  (page . 2)
  (overlay . #<overlay in no buffer>))

> Is this a mistake in this function, i.e. shouldn't it read the winprop
> page?

That happens during the second time the function is called with a real
window by making the overlay showing the image with that window's page
visible.

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

Tassilo Horn <tsdh@gnu.org> writes:

> Andreas Politz <politza@hochschule-trier.de> writes:
>> and this
>>
>> (with-current-buffer (find-file-noselect "some.pdf")
>>   (doc-view-goto-page 2)
>>   (pop-to-buffer (current-buffer)))
>>
>> also displays the first page.
>
> No, if some.pdf hasn't been open yet, it'll show page 2.  [...]

>> [...] shouldn't it read the winprop page?
>
> That happens during the second time the function is called with a real
> window by making the overlay showing the image with that window's page
> visible.

I am using a non-temporary cache directory and this makes a difference.

If the document is not yet converted when opening it, it works as you
said.  But if it is, the code which would insert the image after the
conversion never runs and the winprops for the popped up window look
like this:

(#<window 24 on some.pdf>
          (info . #("Page 2 of 4.\n" 0 12 (face bold)))
          (page . 2)
          (overlay . #<overlay in no buffer>))

,with overlay properties (shortened)

(help-echo "Page 2 of 4."
 display "Welcome to DocView! ..."
 window t
 doc-view t)

Then the last sexp in doc-view-new-window-function switches to the first
page, without using the page property.

-ap

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Stefan Monnier]

> Yes, but I think that doesn't suffice.  The problem with bookmarks is
> that the display window function is run after the bookmark handler, so
> we have no clue in which window the bookmarked page is going to be
> shown.  It may be the current window, an existing other window (which
> might already show another page of the doc and thus already has an entry
> in `image-mode-winprops-alist'), or a completely new window.

Why does it matter?


        Stefan

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>> Yes, but I think that doesn't suffice.  The problem with bookmarks is
>> that the display window function is run after the bookmark handler,
>> so we have no clue in which window the bookmarked page is going to be
>> shown.  It may be the current window, an existing other window (which
>> might already show another page of the doc and thus already has an
>> entry in `image-mode-winprops-alist'), or a completely new window.
>
> Why does it matter?

Please correct me if I'm wrong in the following.

The winprops alist contains for a doc-view buffer the shown page for any
window where the buffer has been shown plus a default entry that's used
when the doc-view buffer is going to be shown in a new window.

Let's assume I open foo.pdf with find-file and a single window.  The
default entry will get page 1 assigned and when it gets shown in a
window, a new winprops entry for that window is created, also with page
1.  Now I switch to page 2, then split and switch to page 3 in the new
window, so my layout is as follows (* = selected window):

    | Window 1 (P2) | *Window 2 (P3) |

Let's assume I have a bookmark on page 4 in foo.pdf.  Then

  a) bookmark-jump should change the page in window 2
  b) bookmark-jump-other-window should change the page in window 1

However, both first call `doc-view-bookmark-jump' and thereafter either
`switch-to-buffer' or `pop-to-buffer'.  How could the doc-view bookmark
handler cope with this situation?

Bye,
Tassilo
    

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Andreas Politz <politza@hochschule-trier.de> writes:

>       (let ((page (bookmark-prop-get bmk 'page)))
>         (when (not (eq major-mode 'doc-view-mode))
>           (doc-view-toggle-display))
> !       (run-with-idle-timer 0 nil
> !         (lambda (buffer page)
> !           (when (and (buffer-live-p buffer)
> !                      (window-live-p (get-buffer-window buffer 0)))
> !             (with-selected-window (get-buffer-window buffer 0)
> !               (doc-view-goto-page page))))
> !         (current-buffer) page))))

I just want to mention that even this timer-version acts wrongly when
the display-func of `bookmark-jump' doesn't select the window, because
`get-buffer-window' prefers the selected window.

I don't think that's too much an issue, though, because the provided
interactive bookmark functions use as display-functions only pop- and
switch-to-buffer which will select the window, and then the patch works
fine.

So I'm in favor of committing the patch [before 24.4 is released!] cause
in any case it's better than not being able to open bookmarks to
document files altogether.

The only cleaner way to get it right (I can see) was to change
bookmark.el so that it determines/creates the window to show the buffer
before calling the bookmark handler.  But that's a much larger change
possibly affecting many people that have their own bookmark-jump
functions.

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Andreas Politz]

Do you acknowledge and have an opinion on the cached vs. non-cached
behaviour I did mention earlier ?

-ap

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Andreas Politz <politza@hochschule-trier.de> writes:

> Do you acknowledge and have an opinion on the cached vs. non-cached
> behaviour I did mention earlier ?

No, I haven't looked into the differences yet.  But I think I've come up
with a quite good solution for the general problem right now.  The patch
below allows bookmark handlers to return a function that accepts the
window showing the buffer and then may act on it.  When the
display-function has been run, that function is called and in the
doc-view case sets the page for that window.

Until now, return values of handlers where simply ignored.  It shouldn't
break existing handlers, except if there's some handler that does
something like

  (setq dunno (lambda (...) ...))

or

  (add-hook 'dunno-hook (lambda (...) ...))

as last expression which seems unlikely.  I've grepped the emacs source
code and at least all handlers in there (man, woman, image-mode, gnus,
help, Info) don't do so.

I've tested it with bookmarks to docs that had to be converted anew and
bookmarks to docs that were already cached, and it seems to DTRT in all
cases.

--8<---------------cut here---------------start------------->8---
=== modified file 'lisp/bookmark.el'
--- lisp/bookmark.el	2013-09-11 03:31:56 +0000
+++ lisp/bookmark.el	2013-12-20 13:01:29 +0000
@@ -997,12 +997,18 @@
 
 After calling DISPLAY-FUNCTION, set window point to the point specified
 by BOOKMARK-NAME-OR-RECORD, if necessary, run `bookmark-after-jump-hook',
-and then show any annotations for this bookmark."
-  (bookmark-handle-bookmark bookmark-name-or-record)
+and then show any annotations for this bookmark.
+
+If the handler returns a function, this function will be called
+with the window showing the bookmark buffer."
+  (let ((win-fn (bookmark-handle-bookmark bookmark-name-or-record)))
   (save-current-buffer
     (funcall display-function (current-buffer)))
   (let ((win (get-buffer-window (current-buffer) 0)))
-    (if win (set-window-point win (point))))
+      (when win
+	(set-window-point win (point))
+	(when (functionp win-fn)
+	  (funcall win-fn win)))))
   ;; FIXME: we used to only run bookmark-after-jump-hook in
   ;; `bookmark-jump' itself, but in none of the other commands.
   (run-hooks 'bookmark-after-jump-hook)
@@ -1061,13 +1067,16 @@
     (cons (current-buffer) (point))))
 
 (defun bookmark-handle-bookmark (bookmark-name-or-record)
-  "Call BOOKMARK-NAME-OR-RECORD's handler or `bookmark-default-handler'
-if it has none.  This changes current buffer and point and returns nil,
-or signals a `file-error'.
+  "Call BOOKMARK-NAME-OR-RECORD's handler or
+`bookmark-default-handler' if it has none.  This changes current
+buffer and point, or signals a `file-error'.  The handler may
+return a function with one argument, a window.  This function
+will be called with the window showing the bookmark's buffer.
 
 If BOOKMARK-NAME-OR-RECORD has no file, this is a no-op.  If
 BOOKMARK-NAME-OR-RECORD has a file, but that file no longer exists,
 then offer interactively to relocate BOOKMARK-NAME-OR-RECORD."
+  (prog1
   (condition-case err
       (funcall (or (bookmark-get-handler bookmark-name-or-record)
                    'bookmark-default-handler)
@@ -1106,8 +1115,7 @@
                  (signal (car err) (cdr err))))))))))
   ;; Added by db.
   (when (stringp bookmark-name-or-record)
-    (setq bookmark-current-bookmark bookmark-name-or-record))
-  nil)
+      (setq bookmark-current-bookmark bookmark-name-or-record))))
 
 (define-error 'bookmark-errors nil)
 (define-error 'bookmark-error-no-filename

=== modified file 'lisp/doc-view.el'
--- lisp/doc-view.el	2013-11-28 22:43:09 +0000
+++ lisp/doc-view.el	2013-12-20 12:30:55 +0000
@@ -1866,13 +1866,12 @@
 (defun doc-view-bookmark-jump (bmk)
   ;; This implements the `handler' function interface for record type
   ;; returned by `doc-view-bookmark-make-record', which see.
-  (prog1 (bookmark-default-handler bmk)
+  (bookmark-default-handler bmk)
     (let ((page (bookmark-prop-get bmk 'page)))
+    (lambda (win)
       (when (not (eq major-mode 'doc-view-mode))
         (doc-view-toggle-display))
-      (with-selected-window
-       (or (get-buffer-window (current-buffer) 0)
-	   (selected-window))
+      (with-selected-window win
        (doc-view-goto-page page)))))
--8<---------------cut here---------------end--------------->8---

Good to commit?

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Stefan Monnier]

> No, I haven't looked into the differences yet.  But I think I've come up
> with a quite good solution for the general problem right now.  The patch
> below allows bookmark handlers to return a function that accepts the
> window showing the buffer and then may act on it.  When the
> display-function has been run, that function is called and in the
> doc-view case sets the page for that window.

Sounds good.

> Until now, return values of handlers where simply ignored.  It shouldn't
> break existing handlers, except if there's some handler that does
> something like

If we're worried about such corner cases, we can do the same we do with
completion-boundaries and completion-metadata: require that the function
return (post-display-function . FUN) instead of just FUN.
The probability that some pre-existing bookmark handler returns
something of the form (post-display-function . FUN) is sufficiently
small.

Another option is to use a new bookmark property `post-display-function'.

> I've tested it with bookmarks to docs that had to be converted anew and
> bookmarks to docs that were already cached, and it seems to DTRT in all
> cases.

I think the current behavior in the "already cached" case demonstrates
that we have a bug in there and I'm not sure that your patch fixes that
bug (i.e. maybe it just works around it).
I don't have time to dig into it, sadly.

For emacs-24, your patch is too intrusive, so I think a patch along the
lines of Andreas's might be acceptable, but it should use
bookmark-after-jump-hook instead of using a timer.

As for trunk, your patch is mostly OK.  I think it should be pushed
a bit further, tho: make it so that `display-function' returns the
window (and fall back on calling get-buffer-window), and make it so
that win-fn *replaces* the set-window-point (and receives the bookmark
as additional argument, since it's likely that the function may like to
use data from the bookmark, such as the page).

After all, this get-buffer-window + set-window-point thingy in
bookmark--jump-via is a hack to try and solve the same problem
we're having (tho for "point in normal buffers", instead of for "current
page in doc-view buffers").


        Stefan

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

> For emacs-24, your patch is too intrusive, so I think a patch along
> the lines of Andreas's might be acceptable, but it should use
> bookmark-after-jump-hook instead of using a timer.

Like so?

(defun doc-view-bookmark-jump (bmk)
  ;; This implements the `handler' function interface for record type
  ;; returned by `doc-view-bookmark-make-record', which see.
  (let ((page (bookmark-prop-get bmk 'page)))
    (add-hook 'bookmark-after-jump-hook
	      (lambda ()
		(setq bookmark-after-jump-hook
		      (cdr bookmark-after-jump-hook))
		(when (not (eq major-mode 'doc-view-mode))
		  (doc-view-toggle-display))
		(with-selected-window
		    (or (get-buffer-window (current-buffer) 0)
			(selected-window))
		  (doc-view-goto-page page))))
    (bookmark-default-handler bmk)))

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Stefan Monnier]

>> For emacs-24, your patch is too intrusive, so I think a patch along
>> the lines of Andreas's might be acceptable, but it should use
>> bookmark-after-jump-hook instead of using a timer.

> Like so?

Almost:

> (defun doc-view-bookmark-jump (bmk)
>   ;; This implements the `handler' function interface for record type
>   ;; returned by `doc-view-bookmark-make-record', which see.
>   (let ((page (bookmark-prop-get bmk 'page)))
>     (add-hook 'bookmark-after-jump-hook
> 	      (lambda ()
> 		(setq bookmark-after-jump-hook
> 		      (cdr bookmark-after-jump-hook))

Don't use `setq' on hooks.  Use remove-hook.  Yes I know it's more
complicated, you'll have to use `make-symbol' and fset it with the
above lambda.  But `setq' on hooks really is much too brittle.


        Stefan

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> (defun doc-view-bookmark-jump (bmk)
>>   ;; This implements the `handler' function interface for record type
>>   ;; returned by `doc-view-bookmark-make-record', which see.
>>   (let ((page (bookmark-prop-get bmk 'page)))
>>     (add-hook 'bookmark-after-jump-hook
>> 	      (lambda ()
>> 		(setq bookmark-after-jump-hook
>> 		      (cdr bookmark-after-jump-hook))
>
> Don't use `setq' on hooks.  Use remove-hook.  Yes I know it's more
> complicated, you'll have to use `make-symbol' and fset it with the
> above lambda.  But `setq' on hooks really is much too brittle.

I knew it wasn't a good idea, but I didn't think of fset-ing an
uninterned symbol.  Good idea!

Hm, but somehow I cannot commit with vc.  I always get

  bzr: ERROR: Unrecognized bug debbugs:16090. Commit refused.

But that's the right number!

Bye,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Glenn Morris]

Tassilo Horn wrote:

> Hm, but somehow I cannot commit with vc.  I always get
>
>   bzr: ERROR: Unrecognized bug debbugs:16090. Commit refused.

Thanks to Emacs's .dir-locals.el, you MUST add an entry to
your ~/.bazaar/bazaar.conf of the form:

  [DEFAULT]
  bugtracker_debbugs_url = http://debbugs.gnu.org/{id}

Else you get this confusing error when you try to commit something with
a Fixes: field.

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Glenn Morris <rgm@gnu.org> writes:

Hi Glenn,

>> Hm, but somehow I cannot commit with vc.  I always get
>>
>>   bzr: ERROR: Unrecognized bug debbugs:16090. Commit refused.
>
> Thanks to Emacs's .dir-locals.el, you MUST add an entry to
> your ~/.bazaar/bazaar.conf of the form:
>
>   [DEFAULT]
>   bugtracker_debbugs_url = http://debbugs.gnu.org/{id}
>
> Else you get this confusing error when you try to commit something
> with a Fixes: field.

Ah, that did the trick.  Ok, the change is committed on the emacs-24
branch.

Thanks,
Tassilo

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Stefan Monnier]

> So I'm in favor of committing the patch [before 24.4 is released!] cause
> in any case it's better than not being able to open bookmarks to
> document files altogether.

There's still a lot of time before 24.4 is released, so there's no hurry
in this respect.

I'd like to first understand the underlying problem better.


        Stefan

bug#16090: 24.3.50; [PATCH] error when jumping to a doc-view bookmark

[Tassilo Horn]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>> So I'm in favor of committing the patch [before 24.4 is released!]
>> cause in any case it's better than not being able to open bookmarks
>> to document files altogether.
>
> There's still a lot of time before 24.4 is released, so there's no
> hurry in this respect.

Sure, we just should not forget about it.  And have a look at my other
patch to bookmark.el & doc-view.el.  I think that's a good fix for the
issue.

Bye,
Tassilo