GNU bug report logs - #31061
27.0.50; next-page of page-ext non-functional in dired

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Marco Wahl <marcowahlsoft <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; next-page of page-ext non-functional in dired 
Date: Wed, 04 Apr 2018 16:24:39 +0200

[Message part 1 (text/plain, inline)]

Precondition:

- Have a dired with several subdirectories open.

Action:

- C-x C-p C-n

Expectation:

- The dired buffer narrows to the next subdirectory.

Observation:

- The dired buffer narrows to the current subdirectory.


Proposition for a fix should be attached.


Thanks.





In GNU Emacs 27.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.22.29)
 of 2018-03-28 built on tm6592
Repository revision: 4b3f1a95567127ee39a7a3e4704bb1faa34b5282
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Arch Linux

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C-x C-g is undefined

Configured using:
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[0001-Fix-next-page-for-certain-page-delimiters.patch (text/x-patch, attachment)]

Message #10 received at 31061 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Marco Wahl <marcowahlsoft <at> gmail.com>
Cc: 31061 <at> debbugs.gnu.org
Subject: Re: bug#31061: 27.0.50; next-page of page-ext non-functional in dired
Date: Tue, 24 Apr 2018 21:51:16 -0400

[Message part 1 (text/plain, inline)]

Marco Wahl <marcowahlsoft <at> gmail.com> writes:

> Precondition:
>
> - Have a dired with several subdirectories open.

Also, M-x load-lib RET page-ext RET

> Action:
>
> - C-x C-p C-n
>
> Expectation:
>
> - The dired buffer narrows to the next subdirectory.
>
> Observation:
>
> - The dired buffer narrows to the current subdirectory.

> * lisp/textmodes/page-ext.el (next-page): Jump ahead page-delimiter if
>   at such before narrow.  This fixes the command for dired.

I think the problem is rather that next-page is going an extra page
backwards even when COUNT was positive, so the fix should be more like
this (inline version with whitespace changes ignored, full version
attached):

--- a/lisp/textmodes/page-ext.el
+++ b/lisp/textmodes/page-ext.el
@@ -304,6 +304,7 @@ next-page
   (or count (setq count 1))
   (widen)
   ;; Cannot use forward-page because of problems at page boundaries.
+  (if (>= count 0)
       (while (and (> count 0) (not (eobp)))
         (if (re-search-forward page-delimiter nil t)
             nil
@@ -316,7 +317,7 @@ next-page
       (if (re-search-backward page-delimiter nil t)
           (goto-char (match-beginning 0))
         (goto-char (point-min)))
-    (setq count (1+ count)))
+      (setq count (1+ count))))
   (narrow-to-page)
   (goto-char (point-min))
   (recenter 0))

[0001-Fix-off-by-1-error-in-next-page-Bug-31061.patch (text/plain, attachment)]

Message #13 received at 31061 <at> debbugs.gnu.org (full text, mbox):

From: Marco Wahl <marcowahlsoft <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 31061 <at> debbugs.gnu.org
Subject: Re: bug#31061: 27.0.50; next-page of page-ext non-functional in dired
Date: Fri, 27 Apr 2018 13:50:08 +0200

Noam Postavsky <npostavs <at> gmail.com> writes:

> Marco Wahl <marcowahlsoft <at> gmail.com> writes:
>
>> Precondition:
>>
>> - Have a dired with several subdirectories open.
>
> Also, M-x load-lib RET page-ext RET

Yes, thanks.

>> Action:
>>
>> - C-x C-p C-n
>>
>> Expectation:
>>
>> - The dired buffer narrows to the next subdirectory.
>>
>> Observation:
>>
>> - The dired buffer narrows to the current subdirectory.
>
>> * lisp/textmodes/page-ext.el (next-page): Jump ahead page-delimiter if
>>   at such before narrow.  This fixes the command for dired.
>
> I think the problem is rather that next-page is going an extra page
> backwards even when COUNT was positive, so the fix should be more like
> this (inline version with whitespace changes ignored, full version
> attached):
>
> --- a/lisp/textmodes/page-ext.el
> +++ b/lisp/textmodes/page-ext.el
> @@ -304,6 +304,7 @@ next-page
>    (or count (setq count 1))
>    (widen)
>    ;; Cannot use forward-page because of problems at page boundaries.
> +  (if (>= count 0)
>        (while (and (> count 0) (not (eobp)))
>          (if (re-search-forward page-delimiter nil t)
>              nil
> @@ -316,7 +317,7 @@ next-page
>        (if (re-search-backward page-delimiter nil t)
>            (goto-char (match-beginning 0))
>          (goto-char (point-min)))
> -    (setq count (1+ count)))
> +      (setq count (1+ count))))
>    (narrow-to-page)
>    (goto-char (point-min))
>    (recenter 0))

I think this is a good idea to separate the cases clearly.

I found that with your suggestion next-page with negative argument goes
back one page too much in a dired buffer, though.

I further think that the core of the irritation is that `narrow-to-page'
does not narrow to the following page when on the start of the '\n\n'
page-separator (unlike for the usual '^^L' separator).

Starting with your fix I propose this modification of the else part:

    (while (and (< count 1) (not (bobp)))
      (if (re-search-backward page-delimiter nil t)
          (when (= count 0)
              (goto-char (match-end 0)))
        (goto-char (point-min)))
      (setq count (1+ count)))

This is: go to the end of the delimiter when the final page has been
reached.

Below a diff to make the suggested change perfectly clear, hopefully.

diff --git a/lisp/textmodes/page-ext.el b/lisp/textmodes/page-ext.el
index fbdae5892a..4990fde65a 100644
--- a/lisp/textmodes/page-ext.el
+++ b/lisp/textmodes/page-ext.el
@@ -304,19 +304,21 @@ next-page
   (or count (setq count 1))
   (widen)
   ;; Cannot use forward-page because of problems at page boundaries.
-  (while (and (> count 0) (not (eobp)))
-    (if (re-search-forward page-delimiter nil t)
-        nil
-      (goto-char (point-max)))
-    (setq count (1- count)))
-  ;; If COUNT is negative, we want to go back -COUNT + 1 page boundaries.
-  ;; The first page boundary we reach is the top of the current page,
-  ;; which doesn't count.
-  (while (and (< count 1) (not (bobp)))
-    (if (re-search-backward page-delimiter nil t)
-	(goto-char (match-beginning 0))
-      (goto-char (point-min)))
-    (setq count (1+ count)))
+  (if (>= count 0)
+      (while (and (> count 0) (not (eobp)))
+        (if (re-search-forward page-delimiter nil t)
+            nil
+          (goto-char (point-max)))
+        (setq count (1- count)))
+   ;; If COUNT is negative, we want to go back -COUNT + 1 page boundaries.
+   ;; The first page boundary we reach is the top of the current page,
+   ;; which doesn't count.
+    (while (and (< count 1) (not (bobp)))
+      (if (re-search-backward page-delimiter nil t)
+          (when (= count 0)
+              (goto-char (match-end 0)))
+        (goto-char (point-min)))
+      (setq count (1+ count))))
   (narrow-to-page)
   (goto-char (point-min))
   (recenter 0))

Message #16 received at 31061 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Marco Wahl <marcowahlsoft <at> gmail.com>
Cc: 31061 <at> debbugs.gnu.org
Subject: Re: bug#31061: 27.0.50; next-page of page-ext non-functional in dired
Date: Sat, 28 Apr 2018 20:13:51 -0400

Marco Wahl <marcowahlsoft <at> gmail.com> writes:

> I found that with your suggestion next-page with negative argument goes
> back one page too much in a dired buffer, though.
>
> I further think that the core of the irritation is that `narrow-to-page'
> does not narrow to the following page when on the start of the '\n\n'
> page-separator (unlike for the usual '^^L' separator).

As far as I can tell, narrow-to-page still has the same problem with the
default "\n\f" separator as the "\n\n" one.  It's just that the problem
is more visually obvious in the dired case.  Using thingatpt seems to
work better (but this doesn't handle the COUNT argument for
narrow-to-page):

    (let ((bounds (bounds-of-thing-at-point 'page)))
      (narrow-to-region (car bounds) (cdr bounds)))

Though I guess it might be arguable whether the page separator should
count as part of the page or not.  The above expression (and
`mark-page') treat the separator as part of the preceding page,
`narrow-to-page' seems to exclude the separator from the page.

> Starting with your fix I propose this modification of the else part:
>
>     (while (and (< count 1) (not (bobp)))
>       (if (re-search-backward page-delimiter nil t)
>           (when (= count 0)
>               (goto-char (match-end 0)))
>         (goto-char (point-min)))
>       (setq count (1+ count)))
>
> This is: go to the end of the delimiter when the final page has been
> reached.

Yeah, that works.

Message #19 received at 31061 <at> debbugs.gnu.org (full text, mbox):

From: Marco Wahl <marcowahlsoft <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 31061 <at> debbugs.gnu.org
Subject: Re: bug#31061: 27.0.50; next-page of page-ext non-functional in dired
Date: Sun, 29 Apr 2018 22:23:13 +0200

Noam Postavsky <npostavs <at> gmail.com> writes:

> Marco Wahl <marcowahlsoft <at> gmail.com> writes:
>
>> I found that with your suggestion next-page with negative argument goes
>> back one page too much in a dired buffer, though.
>>
>> I further think that the core of the irritation is that `narrow-to-page'
>> does not narrow to the following page when on the start of the '\n\n'
>> page-separator (unlike for the usual '^^L' separator).
>
> As far as I can tell, narrow-to-page still has the same problem with the
> default "\n\f" separator as the "\n\n" one.  It's just that the problem
> is more visually obvious in the dired case.  Using thingatpt seems to
> work better (but this doesn't handle the COUNT argument for
> narrow-to-page):
>
>     (let ((bounds (bounds-of-thing-at-point 'page)))
>       (narrow-to-region (car bounds) (cdr bounds)))
>
> Though I guess it might be arguable whether the page separator should
> count as part of the page or not.  The above expression (and
> `mark-page') treat the separator as part of the preceding page,
> `narrow-to-page' seems to exclude the separator from the page.

I fully agree that one might like the separator to be part of the page.
This might help e.g. for killing and yanking.

Actually I tend towards excluding any separator when narrowing to a
page.  I see a document as sequence like

<content><separator><content><separator>...<separator><content>

and the content is all I'd expect when narrowing to a page.

>> Starting with your fix I propose this modification of the else part:
>>
>>     (while (and (< count 1) (not (bobp)))
>>       (if (re-search-backward page-delimiter nil t)
>>           (when (= count 0)
>>               (goto-char (match-end 0)))
>>         (goto-char (point-min)))
>>       (setq count (1+ count)))
>>
>> This is: go to the end of the delimiter when the final page has been
>> reached.
>
> Yeah, that works.

Cool.

Best regards!

Message #22 received at 31061 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Marco Wahl <marcowahlsoft <at> gmail.com>
Cc: 31061 <at> debbugs.gnu.org
Subject: Re: bug#31061: 27.0.50; next-page of page-ext non-functional in dired
Date: Wed, 02 May 2018 20:36:33 -0400

tags 31061 fixed
close 31061 27.1
quit

Marco Wahl <marcowahlsoft <at> gmail.com> writes:

>>
>> Yeah, that works.
>
> Cool.
>
> Best regards!

Okay, pushed to master.

[1: 8a6521260d]: 2018-05-02 20:35:20 -0400
  Fix next-page for dired (Bug#31061)
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=8a6521260dc650b4b713ea8bc71348cbe730f6e4

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