bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Sam Steingold]

In the group gmane.comp.security.risks on server nntp:news.gmane.io open
an article and type C-d (gnus-summary-enter-digest-group).
Then enter a message from the summary buffer (e.g., SPC)
and now (gnus-fetch-original-field "Newsgroups") returns nil instead of
"gmane.comp.security.risks" as it should.
The variable gnus-original-article-buffer evaluates to
" *Original Article gmane.comp.security.risks*"
and that buffer starts like this:

--8<---------------cut here---------------start------------->8---
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: RISKS List Owner <risko@csl.sri.com>
Newsgroups: gmane.comp.security.risks
Subject: Risks Digest 33.09
Date: Tue, 15 Mar 2022 16:23:26 PDT
Approved: news@gmane.org
Message-ID: <CMM.0.90.4.1647386606.risko@chiron.csl.sri.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="10317"; mail-complaints-to="usenet@ciao.gmane.io"
To: risks-resend@csl.sri.com
...
--8<---------------cut here---------------end--------------->8---



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-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://www.dhimmitude.org https://thereligionofpeace.com
Parachute for sale, used once, never opened, small stain.

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Lars Ingebrigtsen]

Sam Steingold <sds@gnu.org> writes:

> In the group gmane.comp.security.risks on server nntp:news.gmane.io open
> an article and type C-d (gnus-summary-enter-digest-group).
> Then enter a message from the summary buffer (e.g., SPC)
> and now (gnus-fetch-original-field "Newsgroups") returns nil instead of
> "gmane.comp.security.risks" as it should.
> The variable gnus-original-article-buffer evaluates to
> " *Original Article gmane.comp.security.risks*"
> and that buffer starts like this:

I think there's a misunderstanding here -- the "original" that the
function is fetching is the unformatted "original" version of the thing
that's displayed in the *Article* buffer.  It has nothing to do with how
the article was sourced (which was via a digest in this case).

So this is working as designed.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> So this is working as designed.

If you want to get at the newsgroup name of the parent group, that's
stashed in the info params, so you should be able to get at that data
via something like:

(gnus-info-params (gnus-get-info gnus-newsgroup-name))

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Sam Steingold]

> * Lars Ingebrigtsen <ynefv@tahf.bet> [2022-03-17 13:06:08 +0100]:
>
> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>> So this is working as designed.
>
> If you want to get at the newsgroup name of the parent group, that's
> stashed in the info params, so you should be able to get at that data
> via something like:
>
> (gnus-info-params (gnus-get-info gnus-newsgroup-name))

for gnus-newsgroup-name = "gmane.comp.security.risks", the above returns

--8<---------------cut here---------------start------------->8---
((timestamp . 1647530087))
--8<---------------cut here---------------end--------------->8---

How do I get the headers like "Newsgroups" or "Content-Type"?

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://honestreporting.com https://jij.org https://ffii.org
Who is General Failure and why is he reading my hard disk?

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Lars Ingebrigtsen]

Sam Steingold <sds@gnu.org> writes:

>> (gnus-info-params (gnus-get-info gnus-newsgroup-name))
>
> for gnus-newsgroup-name = "gmane.comp.security.risks", the above returns
>
> ((timestamp . 1647530087))

You have to call that in the nndoc group.

> How do I get the headers like "Newsgroups" or "Content-Type"?

I don't think the latter is stored anywhere.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Sam Steingold]

Context (see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54423):
`bbdb-message-header' calls `gnus-fetch-original-field' which,
for a digest ("nndoc") group, returns nil for every header.

The root of the problem is that `gnus-fetch-original-field' relies on
`gnus-original-article-buffer' which is buffer-local:

--8<---------------cut here---------------start------------->8---
gnus-original-article-buffer is a variable defined in ‘gnus.el’.

Its value is
" *Original Article nndoc:gmane.comp.security.risks-1023*"
Local in buffer *Summary nndoc:gmane.comp.security.risks-1023*; global value is the same.
--8<---------------cut here---------------end--------------->8---

(buffer " *Original Article nndoc:gmane.comp.security.risks-1023*" is _empty_!)
and at the _same_ time (no gnus command executed, just a buffer switch):

--8<---------------cut here---------------start------------->8---
gnus-original-article-buffer is a variable defined in ‘gnus.el’.

Its value is " *Original Article gmane.comp.security.risks*"
Local in buffer *Summary gmane.comp.security.risks*; global value is the same.
--8<---------------cut here---------------end--------------->8---

Lars suggested that I use this:

--8<---------------cut here---------------start------------->8---
(gnus-info-params (gnus-get-info gnus-newsgroup-name))
--8<---------------cut here---------------end--------------->8---

and it appears that the following works:

--8<---------------cut here---------------start------------->8---
diff --git a/lisp/bbdb-mua.el b/lisp/bbdb-mua.el
index f9d141d..ab3863c 100644
--- a/lisp/bbdb-mua.el
+++ b/lisp/bbdb-mua.el
@@ -111,7 +111,17 @@ MIME encoded headers are decoded.  Return nil if HEADER does not exist."
                      ;; `bbdb-select-message' does not get fooled by an apparent
                      ;; absence of some headers.
                      ;; See http://permalink.gmane.org/gmane.emacs.gnus.general/78741
-                     (eq mua 'gnus) (gnus-fetch-original-field header))
+                     (eq mua 'gnus)
+                     (or (gnus-fetch-original-field header)
+                         ;; See https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54423
+                         ;; 'gnus-fetch-original-field' returns nil in nndoc groups
+                         ;; (digests) because the 'qgnus-original-article-buffer' is
+                         ;; empty for the nndoc summary but not for the parent summary.
+                         (and-let* ((i (gnus-get-info gnus-newsgroup-name))
+                                    (p (gnus-info-params i))
+                                    (parent-summary-buffer (cadr (assq 'quit-config p))))
+                           (with-current-buffer parent-summary-buffer
+                             (gnus-fetch-original-field header)))))
                     ((eq mua 'vm) (bbdb/vm-header header))
                     ((eq mua 'rmail)
                      (with-current-buffer rmail-buffer
--8<---------------cut here---------------end--------------->8---

`quit-config' contains the parent summary buffer object.
I would rather use that directly that construct the string
" *Original Article gmane.comp.security.risks*"
(especially since the relevant logic in `gnus-article-setup-buffer' is
moderately convoluted).

The question is whether this is TRT or there is a better way.

Thanks to Lars for his patience, and to everyone else for possible
suggestion.

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://honestreporting.com https://camera.org http://think-israel.org
Money does not bother me at all.  In fact, it calms me down.

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Roland Winkler]

On Mon, Mar 21 2022, Sam Steingold wrote:
> Lars suggested that I use this:
>
> (gnus-info-params (gnus-get-info gnus-newsgroup-name))
>
> and it appears that the following works:
>
[snip]
> +          (and-let* ((i (gnus-get-info gnus-newsgroup-name))
> +                     (p (gnus-info-params i))
> +                     (parent-summary-buffer (cadr (assq 'quit-config p))))
> +            (with-current-buffer parent-summary-buffer
> +              (gnus-fetch-original-field header)))))

...Is the (and-let*... needed?  Of course, one could wrap all code that
way.  But and-let* is not even part of Emacs 25 that current BBDB is
supposed to support.  Also, if the above code should fail in certain
cases, it might be an indication that the above code is not yet exactly
what is needed so that this should not be swept under the carpet.  So I
feel that
 
  (with-current-buffer (cadr (assq 'quit-config
                                   (gnus-info-params
                                    (gnus-get-info gnus-newsgroup-name))))

is the better way to go.  Am I missing something?

Or: If the corner cases when the code can still fail are known and the
failure is in that sense intentional, this should be made more explicit
in the code.

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Sam Steingold]

I added bbdb-user to CC.

For context (see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54423 for
full details), the problem is that `bbdb-message-header' calls
`gnus-fetch-original-field' which, for a digest group, returns nil.
This prevents `bbdb-accept-message-alist' from working for, e.g.,

--8<---------------cut here---------------start------------->8---
(("Newsgroups" . "\\(gmane\\.emacs\\|gmane\\.comp\\.security\\.risks\\)"))
--8<---------------cut here---------------end--------------->8---

because every message in gmane.comp.security.risks is a digest.

> * Lars Ingebrigtsen <ynefv@tahf.bet> [2022-03-17 11:59:43 +0100]:
>
> Sam Steingold <sds@gnu.org> writes:
>
>> In the group gmane.comp.security.risks on server nntp:news.gmane.io open
>> an article and type C-d (gnus-summary-enter-digest-group).
>> Then enter a message from the summary buffer (e.g., SPC)
>> and now (gnus-fetch-original-field "Newsgroups") returns nil instead of
>> "gmane.comp.security.risks" as it should.
>> The variable gnus-original-article-buffer evaluates to
>> " *Original Article gmane.comp.security.risks*"
>> and that buffer starts like this:
>
> I think there's a misunderstanding here -- the "original" that the
> function is fetching is the unformatted "original" version of the thing
> that's displayed in the *Article* buffer.  It has nothing to do with how
> the article was sourced (which was via a digest in this case).
>
> So this is working as designed.

Okay, so how do I extract "Newsgroups" or "Content-Type" for a message
in a digest?

Thank you Lars.

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://mideasttruth.com https://jij.org https://honestreporting.com
I may be getting older, but I refuse to grow up!

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Roland Winkler]

On Thu, Mar 17 2022, Sam Steingold wrote:
> the problem is that `bbdb-message-header' calls
> `gnus-fetch-original-field' which, for a digest group, returns nil.
> This prevents `bbdb-accept-message-alist' from working for, e.g.,
>
> (("Newsgroups" . "\\(gmane\\.emacs\\|gmane\\.comp\\.security\\.risks\\)"))
>
> because every message in gmane.comp.security.risks is a digest.

While I included the call of `gnus-fetch-original-field' in
`bbdb-message-header', I need to admit that the above issue goes much
beyond my knowledge of Gnus internals.  If there are better ways for
`bbdb-message-header' to achieve what it needs to achieve (which is
grabbing the content of (what appear to be) headers of a message),
then I certainly appreciate any patches for BBDB.

Roland

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Lars Ingebrigtsen]

Roland Winkler <winkler@gnu.org> writes:

> While I included the call of `gnus-fetch-original-field' in
> `bbdb-message-header', I need to admit that the above issue goes much
> beyond my knowledge of Gnus internals.  If there are better ways for
> `bbdb-message-header' to achieve what it needs to achieve (which is
> grabbing the content of (what appear to be) headers of a message),
> then I certainly appreciate any patches for BBDB.

If the intention is to collect data from the parent group (which is a
thing mostly just for nndoc groups), you first have to determine what
the parent group is, and then you can select the data from the buffer
that's named something like " *Original Article group.name*".

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Roland Winkler]

On Thu, Mar 17 2022, Lars Ingebrigtsen wrote:
> If the intention is to collect data from the parent group (which is a
> thing mostly just for nndoc groups), you first have to determine what
> the parent group is, and then you can select the data from the buffer
> that's named something like " *Original Article group.name*".

Thanks for the clarification! - This brings me back to what I said: if
someone more knowledgable of Gnus internals can translate the above into
code for `bbdb-message-header', I'll appreciate that.  I can also try do
that myself.  But then I cannot promise anything.

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Sam Steingold]

> * Lars Ingebrigtsen <ynefv@tahf.bet> [2022-03-17 20:43:26 +0100]:
>
> Roland Winkler <winkler@gnu.org> writes:
>
>> While I included the call of `gnus-fetch-original-field' in
>> `bbdb-message-header', I need to admit that the above issue goes much
>> beyond my knowledge of Gnus internals.  If there are better ways for
>> `bbdb-message-header' to achieve what it needs to achieve (which is
>> grabbing the content of (what appear to be) headers of a message),
>> then I certainly appreciate any patches for BBDB.
>
> If the intention is to collect data from the parent group (which is a
> thing mostly just for nndoc groups), you first have to determine what
> the parent group is, and then you can select the data from the buffer
> that's named something like " *Original Article group.name*".

...which brings us back to my original message ;-)

Specifically, `bbdb-message-header' calls

--8<---------------cut here---------------start------------->8---
(defun gnus-fetch-original-field (field)
  "Fetch FIELD from the original version of the current article."
  (with-current-buffer gnus-original-article-buffer
    (gnus-fetch-field field)))
--8<---------------cut here---------------end--------------->8---

The variable gnus-original-article-buffer evaluates to
" *Original Article gmane.comp.security.risks*"
and that buffer starts like this:

--8<---------------cut here---------------start------------->8---
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: RISKS List Owner <risko@csl.sri.com>
Newsgroups: gmane.comp.security.risks
Subject: Risks Digest 33.09
Date: Tue, 15 Mar 2022 16:23:26 PDT
Approved: news@gmane.org
Message-ID: <CMM.0.90.4.1647386606.risko@chiron.csl.sri.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="10317"; mail-complaints-to="usenet@ciao.gmane.io"
To: risks-resend@csl.sri.com
...
--8<---------------cut here---------------end--------------->8---

and (gnus-fetch-original-field "Newsgroups") returns nil even though the
original article buffer contains the appropriate header...

Thank you for your kind attention.


-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
http://think-israel.org https://jihadwatch.org https://iris.org.il
Those who can laugh at themselves will never cease to be amused.

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Lars Ingebrigtsen]

Sam Steingold <sds@gnu.org> writes:

> The variable gnus-original-article-buffer evaluates to
> " *Original Article gmane.comp.security.risks*"

Evaluates to that where?  It's usually a buffer-local variable.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#54423: 29.0.50; gnus-fetch-original-field returns nil in digest

[Sam Steingold]

> * Lars Ingebrigtsen <ynefv@tahf.bet> [2022-03-17 11:59:43 +0100]:
>
> Sam Steingold <sds@gnu.org> writes:
>
>> In the group gmane.comp.security.risks on server nntp:news.gmane.io open
>> an article and type C-d (gnus-summary-enter-digest-group).
>> Then enter a message from the summary buffer (e.g., SPC)
>> and now (gnus-fetch-original-field "Newsgroups") returns nil instead of
>> "gmane.comp.security.risks" as it should.
>> The variable gnus-original-article-buffer evaluates to
>> " *Original Article gmane.comp.security.risks*"
>> and that buffer starts like this:
>
> I think there's a misunderstanding here -- the "original" that the
> function is fetching is the unformatted "original" version of the thing
> that's displayed in the *Article* buffer.  It has nothing to do with how
> the article was sourced (which was via a digest in this case).

Nevertheless, the '''unformatted "original" version of the thing
that's displayed in the *Article* buffer''' is the
`gnus-original-article-buffer' which points to buffer
" *Original Article gmane.comp.security.risks*"
which _does_ contain all the needed goodies,
_BUT_ `gnus-fetch-original-field' does _NOT_ return them.

IOW, `mail-fetch-field',
called by `message-fetch-field',
called by `gnus-fetch-field',
called by `gnus-fetch-original-field',
returns nil.

`gnus-fetch-original-field' calls `gnus-fetch-field'
inside `with-current-buffer gnus-original-article-buffer`
and the buffer referenced by `gnus-original-article-buffer'
_does_ contain the fields in the header.

> So this is working as designed.

Then how should bbdb extract the "Newsgroups" et al?

Thank you!

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://iris.org.il https://memri.org https://mideasttruth.com
Man has 2 states: hungry/angry and sate/sleepy.  Catch him in transition.