GNU bug report logs - #36927
26.2.90; include stdarg.h is without hyperlinking on vfprintf's manpage

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

From: VanL <van <at> scratch.space>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Mon, 5 Aug 2019 11:51:56 +1000

Hello,

See manpage for vfprintf().

Unlike the first instance of the #include preprocessing directive

  #include <stdio.h>

at approximately line 12 of printf(3), which is underlined and
hyperlinked, the second instance at approximately line 32, is not
underlined and not hyperlinked.

1. M-x man RET vfprintf
2. on line 32 see #include <stdarg.h> which is without hyperlinking


In GNU Emacs 26.2.90 (build 2, x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 10.11.6 (Build 15G22010))
of 2019-06-19 built on xxx.xxx
Repository revision: 9473231e0f0e96752447e76217ce8938ddeb00c7
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Invoking man vfprintf in the background
vfprintf man page formatted

Configured using:
'configure CC=/usr/bin/clang --without-compress-install --with-ns
--enable-ns-self-contained --with-jpeg=no --with-gif=no --with-tiff=no
--without-x --with-cairo --without-xwidgets --with-mailutils'

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THREADS LCMS2

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Message #8 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: VanL <van <at> scratch.space>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Mon, 05 Aug 2019 19:10:28 +0300

> From: VanL <van <at> scratch.space>
> Date: Mon, 5 Aug 2019 11:51:56 +1000
> 
> See manpage for vfprintf().
> 
> Unlike the first instance of the #include preprocessing directive
> 
>   #include <stdio.h>
> 
> at approximately line 12 of printf(3), which is underlined and
> hyperlinked, the second instance at approximately line 32, is not
> underlined and not hyperlinked.
> 
> 1. M-x man RET vfprintf
> 2. on line 32 see #include <stdarg.h> which is without hyperlinking

For some reason, we don't put a button on the second #include.

Interestingly enough, I can reproduce this on GNU/Linux, but not on
MS-Windows, even if I produce the formatted man page on GNU/Linux and
then display it on Windows.  So I guess the problem is somehow related
to the slightly  different scripts we use to massage the man page for
display.

Message #11 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: VanL <van <at> scratch.space>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Tue, 6 Aug 2019 12:36:17 +1000

> On 6 Aug 2019, at 02:10, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>> 1. M-x man RET vfprintf
>> 2. on line 32 see #include <stdarg.h> which is without hyperlinking
> 
> For some reason, we don't put a button on the second #include.

The buttoning needs to be more aggressive.

> Interestingly enough, I can reproduce this on GNU/Linux, but not on
> MS-Windows, even if I produce the formatted man page on GNU/Linux and
> then display it on Windows.  So I guess the problem is somehow related
> to the slightly  different scripts we use to massage the man page for
> display.

Three variants of bsd platform reproduces this like GNU/Linux.

Message #14 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: VanL <van <at> scratch.space>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Tue, 06 Aug 2019 06:56:46 +0300

On August 6, 2019 5:36:17 AM GMT+03:00, VanL <van <at> scratch.space> wrote:
> 
> > On 6 Aug 2019, at 02:10, Eli Zaretskii <eliz <at> gnu.org> wrote:
> > 
> >> 1. M-x man RET vfprintf
> >> 2. on line 32 see #include <stdarg.h> which is without hyperlinking
> > 
> > For some reason, we don't put a button on the second #include.
> 
> The buttoning needs to be more aggressive.

You mean, like making every word a button?

> > Interestingly enough, I can reproduce this on GNU/Linux, but not on
> > MS-Windows, even if I produce the formatted man page on GNU/Linux
> and
> > then display it on Windows.  So I guess the problem is somehow
> related
> > to the slightly  different scripts we use to massage the man page
> for
> > display.
> 
> Three variants of bsd platform reproduces this like GNU/Linux.

All Posix platforms use the same script to massage the 'man' output, so this is hardly surprising.

Do you actually see what causes the failure to put a button on the second include?

Message #17 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: VanL <van <at> scratch.space>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Tue, 6 Aug 2019 17:22:42 +1000

> On 6 Aug 2019, at 13:56, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>>> For some reason, we don't put a button on the second #include.
>> 
>> The buttoning needs to be more aggressive.
> 
> You mean, like making every word a button?

In this case, I mean the lines containing the 'include' preprocessing directive for C.

Where you make every word a button, possibly, leads to an inverted tree index for search engines to digest, perhaps 'C-h a' short for '(ask-emacs-anything)' is then possible. 

>> Three variants of bsd platform reproduces this like GNU/Linux.
> 
> All Posix platforms use the same script to massage the 'man' output, so this is hardly surprising.

The script to massage by 'M-x woman RET vfprintf' produces pure, unadulterated formatting in text-mode.

line 11: .In stdio.h
line 24: .In stdarg.h

> Do you actually see what causes the failure to put a button on the second include?

There's that below but lisp/button.el.gz doesn't have any Man variable I can see.

2 matches for "Man-include-regexp" in buffer: man.el.gz
    338:(defvar Man-include-regexp "#[ \t]*include[ \t]*"
    348:  (concat "\\(" Man-include-regexp "\\)"

14 matches in 12 lines for "include" in buffer: man.el.gz
    231:        (base '("/usr/include" "/usr/local/include")))
    234:      (append base (list (expand-file-name arch "/usr/include")))))
    338:(defvar Man-include-regexp "#[ \t]*include[ \t]*"
    339:  "Regular expression describing the #include (directive of cpp).")
    342:  "Regular expression describing <> in #include line (directive of cpp).")
    348:  (concat "\\(" Man-include-regexp "\\)"
    358:;; This includes the section as an optional part to catch hyphenated
    794:          ;; doesn't include a hyphen, we consider the hyphen to be
    799:	;; Make sure the section number gets included by the code below.
    812:	      ;; include the section number in the returned value.
   1265:References include items in the SEE ALSO section,
   1266:header file (#include <foo.h>), and files in FILES.

Message #20 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: VanL <van <at> scratch.space>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Tue, 06 Aug 2019 17:36:08 +0300

> From: VanL <van <at> scratch.space>
> Date: Tue, 6 Aug 2019 17:22:42 +1000
> Cc: 36927 <at> debbugs.gnu.org
> 
> >> Three variants of bsd platform reproduces this like GNU/Linux.
> > 
> > All Posix platforms use the same script to massage the 'man' output, so this is hardly surprising.
> 
> The script to massage by 'M-x woman RET vfprintf' produces pure, unadulterated formatting in text-mode.

"M-x woman" uses an entirely different implementation: it actually
formats the man page by itself, and thus doesn't need any script for
massaging the output of 'man'.

> > Do you actually see what causes the failure to put a button on the second include?
> 
> There's that below but lisp/button.el.gz doesn't have any Man variable I can see.

Thanks.

Message #23 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: VanL <van <at> scratch.space>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Wed, 7 Aug 2019 18:57:35 +1000

> On 7 Aug 2019, at 00:36, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> "M-x woman" uses an entirely different implementation: it actually
> formats the man page by itself, and thus doesn't need any script for
> massaging the output of 'man'.

IIRC "M-x woman" was made for MS-Windows and the Posix box could be ticked by some versions of MS-Windows.

Message #26 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: van <at> scratch.space
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Fri, 09 Aug 2019 16:58:00 +0300

> Date: Mon, 05 Aug 2019 19:10:28 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 36927 <at> debbugs.gnu.org
> 
> > From: VanL <van <at> scratch.space>
> > Date: Mon, 5 Aug 2019 11:51:56 +1000
> > 
> > See manpage for vfprintf().
> > 
> > Unlike the first instance of the #include preprocessing directive
> > 
> >   #include <stdio.h>
> > 
> > at approximately line 12 of printf(3), which is underlined and
> > hyperlinked, the second instance at approximately line 32, is not
> > underlined and not hyperlinked.
> > 
> > 1. M-x man RET vfprintf
> > 2. on line 32 see #include <stdarg.h> which is without hyperlinking
> 
> For some reason, we don't put a button on the second #include.

The logic in Man-highlight-references0 was flawed: it assumed that a
section ("SYNOPSIS", "FILES", "SEE ALSO", etc.) is always received
entirely in a single chunk of text that is read from the subprocess,
which is, of course, not guaranteed, and depends on factors such as
the size of each section, buffering, how busy is the system, etc.
(Those reasons also made this a bitch to debug, because a bug comes
and goes unpredictably, and never shows when one steps with Edebug.)

I think I made it much better on master, although I still see a rare
case where one or the other "include" is not buttonized.  But I've run
out of time, so someone else will have to find and fix what I missed.

I'm leaving this bug open because I don't think it's 100% fixed.

Message #29 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: VanL <van <at> scratch.space>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Sat, 10 Aug 2019 15:05:16 +1000

> On 9 Aug 2019, at 23:58, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>> Date: Mon, 05 Aug 2019 19:10:28 +0300
>> From: Eli Zaretskii <eliz <at> gnu.org>
>> Cc: 36927 <at> debbugs.gnu.org
>> 
>>> From: VanL <van <at> scratch.space>
>>> Date: Mon, 5 Aug 2019 11:51:56 +1000
>>> 
>>> See manpage for vfprintf().
>>> 
>>> Unlike the first instance of the #include preprocessing directive
>>> 
>>>  #include <stdio.h>
>>> 
>>> at approximately line 12 of printf(3), which is underlined and
>>> hyperlinked, the second instance at approximately line 32, is not
>>> underlined and not hyperlinked.
>>> 
>>> 1. M-x man RET vfprintf
>>> 2. on line 32 see #include <stdarg.h> which is without hyperlinking
>> 
>> For some reason, we don't put a button on the second #include.
> 
> The logic in Man-highlight-references0 was flawed: it assumed that a
> section ("SYNOPSIS", "FILES", "SEE ALSO", etc.) is always received
> entirely in a single chunk of text that is read from the subprocess,
> which is, of course, not guaranteed, and depends on factors such as
> the size of each section, buffering, how busy is the system, etc.
> (Those reasons also made this a bitch to debug, because a bug comes
> and goes unpredictably, and never shows when one steps with Edebug.)

Thanks.

That sounds really convoluted and this is what I can see

diff --git a/lisp/man.el b/lisp/man.el
index d52ca2156d..8858451b38 100644
--- a/lisp/man.el
+++ b/lisp/man.el
@@ -1288,8 +1288,23 @@ Man-highlight-references
 
 (defun Man-highlight-references0 (start-section regexp button-pos target type)
   ;; Based on `Man-build-references-alist'
-  (when (or (null start-section)
-	    (Man-find-section start-section))
+  (when (or (null start-section)        ;; Search regardless of sections.
+            ;; Section header is in this chunk.
+	    (Man-find-section start-section)
+            ;; Section header was in one of the previous chunks.
+            (save-excursion
+              (save-restriction
+                (let ((orig-pos (point)))
+                  (widen)
+                  (if (Man-find-section start-section)
+                      ;; We are in the right section of the next
+                      ;; section is either not yet in the buffer, or
+                      ;; it starts after the position where we should
+                      ;; start highlighting.
+                      (progn
+                        (forward-line 1)
+                        (or (null (re-search-forward Man-heading-regexp nil t))
+                            (> (point) orig-pos))))))))
     (let ((end (if start-section
 		   (progn
 		     (forward-line 1)

> I think I made it much better on master, although I still see a rare
> case where one or the other "include" is not buttonized.  But I've run
> out of time, so someone else will have to find and fix what I missed.
> 
> I'm leaving this bug open because I don't think it's 100% fixed.

A possible way is to wait for all the subprocess sections to be done and to post-process on the fully collected buffer having lines like

line 11: .In stdio.h
line 24: .In stdarg.h

with buttonization transformation in theory like [1]

--
[1] 
	8.4 Computing with Lists
	https://htdp.org/2019-02-24/part_two.html#%28part._sec~3aeval-list%29

Message #32 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: VanL <van <at> scratch.space>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Sat, 10 Aug 2019 10:48:59 +0300

> From: VanL <van <at> scratch.space>
> Date: Sat, 10 Aug 2019 15:05:16 +1000
> Cc: 36927 <at> debbugs.gnu.org
> 
> > The logic in Man-highlight-references0 was flawed: it assumed that a
> > section ("SYNOPSIS", "FILES", "SEE ALSO", etc.) is always received
> > entirely in a single chunk of text that is read from the subprocess,
> > which is, of course, not guaranteed, and depends on factors such as
> > the size of each section, buffering, how busy is the system, etc.
> > (Those reasons also made this a bitch to debug, because a bug comes
> > and goes unpredictably, and never shows when one steps with Edebug.)
> 
> Thanks.
> 
> That sounds really convoluted and this is what I can see

The comments should explain what the code does.  Let me know which
parts are unclear.

> A possible way is to wait for all the subprocess sections to be done and to post-process on the fully collected buffer having lines like

I considered this possibility, but rejected it: since we display the
man page even before the async subprocess exits, it would mean that
the displayed portion is not fontified until the very end, which would
render the entire idea of formatting in the background useless, and
would have use behave on all platforms as we do on MS-DOS.

Message #35 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: VanL <van <at> scratch.space>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Sun, 11 Aug 2019 15:26:50 +1000

> On 10 Aug 2019, at 17:48, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>> A possible way is to wait for all the subprocess sections to be done and to post-process on the fully collected buffer having lines like
> 
> I considered this possibility, but rejected it: since we display the
> man page even before the async subprocess exits, it would mean that
> the displayed portion is not fontified until the very end, which would
> render the entire idea of formatting in the background useless, and
> would have use behave on all platforms as we do on MS-DOS.

Graphics engines use a two buffer mechanism for collecting unfinished pixels backstage in one buffer and displaying finished pixels on stage in the ready buffer and then they alternate in their role.  Not having all the `#include' lines buttonized is like missing a main character on stage.  Of the 40 `(defun' signatures in man.el the following 6 hint of opportunities in the event model's pipeline to place buttons in at 

  2) `update' or 6) `cleanup' before 3) `notify-when-ready'

1) on line 1075: (defun Man-getpage-in-background (topic)
2) on line 1127: (defun Man-update-manpage ()
3) on line 1154: (defun Man-notify-when-ready (man-buffer)
4) on line 1262: (defun Man-highlight-references (&optional xref-man-type)
5) on line 1289: (defun Man-highlight-references0 (start-section regexp button-pos target type)
6) on line 1331: (defun Man-cleanup-manpage (&optional interactive)     

Message #38 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: VanL <van <at> scratch.space>
Cc: 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Sun, 11 Aug 2019 17:09:38 +0300

> From: VanL <van <at> scratch.space>
> Date: Sun, 11 Aug 2019 15:26:50 +1000
> Cc: 36927 <at> debbugs.gnu.org
> 
> >> A possible way is to wait for all the subprocess sections to be done and to post-process on the fully collected buffer having lines like
> > 
> > I considered this possibility, but rejected it: since we display the
> > man page even before the async subprocess exits, it would mean that
> > the displayed portion is not fontified until the very end, which would
> > render the entire idea of formatting in the background useless, and
> > would have use behave on all platforms as we do on MS-DOS.
> 
> Graphics engines use a two buffer mechanism for collecting unfinished pixels backstage in one buffer and displaying finished pixels on stage in the ready buffer and then they alternate in their role.

We already do that in man.el, effectively: a new chunk of the text is
first fontified and buttonized, and only afterwards displayed.

> Not having all the `#include' lines buttonized is like missing a main character on stage.

I never said anything to the contrary.  I've just spent several hours
of my time fixing that.

> Of the 40 `(defun' signatures in man.el the following 6 hint of opportunities in the event model's pipeline to place buttons in at 
> 
>   2) `update' or 6) `cleanup' before 3) `notify-when-ready'
> 
> 1) on line 1075: (defun Man-getpage-in-background (topic)

That's the top-level function which does the job of, among other
things, fontifying and buttonizing the man page.

> 2) on line 1127: (defun Man-update-manpage ()

Not relevant to the issue at hand: this command is for a different use
case, and it invokes 'man' synchronously anyway.

> 3) on line 1154: (defun Man-notify-when-ready (man-buffer)

This one is called when the 'man' program exits, so waiting until that
time will eliminate the advantage of running 'man' in the background.
Irrelevant.

> 4) on line 1262: (defun Man-highlight-references (&optional xref-man-type)
> 5) on line 1289: (defun Man-highlight-references0 (start-section regexp button-pos target type)

These two are the ones where I made the changes (the first one just
calls the second one).

> 6) on line 1331: (defun Man-cleanup-manpage (&optional interactive)     

Isn't called in the scenario discussed here, so is irrelevant.

Not sure where you are trying to take this discussion.

Message #41 received at 36927 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: van <at> scratch.space, 36927 <at> debbugs.gnu.org
Subject: Re: bug#36927: 26.2.90;
 include stdarg.h is without hyperlinking on vfprintf's manpage
Date: Sun, 18 Aug 2019 18:37:55 -0400

tags 36927 fixed
close 36927 27.1
quit

Eli Zaretskii <eliz <at> gnu.org> writes:

> never shows when one steps with Edebug.)

I had a similar experience when fixing term.el to handle chunking.  I
found using trace-function on the filter function, and then reproducing
the same chunking by calling the filter function directly was an
effective way to handle this.

(Also, changing the default handling of filters as Stefan suggests in
Bug#13400 might help with this.)

> I think I made it much better on master, although I still see a rare
> case where one or the other "include" is not buttonized.  But I've run
> out of time, so someone else will have to find and fix what I missed.
>
> I'm leaving this bug open because I don't think it's 100% fixed.

I think it should be fully fixed now.

f9464020d4 2019-08-18T18:19:21-04:00 "Handle more subprocess chunking in M-x man (Bug#36927)"
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f9464020d403be8344f8293297b27276872571d4

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