GNU bug report logs - #22016
25.0.50; sql-interactive-mode prompts and header alignment in query output

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

From: Phil Sainty <psainty <at> orcon.net.nz>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; sql-interactive-mode prompts and header alignment in query
 output
Date: Thu, 26 Nov 2015 22:51:56 +1300

Regarding the following Question and Answer:

http://emacs.stackexchange.com/q/13315
http://emacs.stackexchange.com/a/18403

In which multi-line SQL queries can result in output like so:

select a, b, c
from table1
where a < 10;

mydb=> mydb=> mydb-> mydb-> mydb->     a     |      b       |   c
----------+--------------+-------
        1 | 2015-01-05   | 59120
        7 | 2015-01-06   | 59121
        3 | 2015-01-07   | 59122
(3 rows)

i.e. we get multiple prompts all on a single line (continuations due
to the multi-line query), and then the header row for the output is
on that same line as well, which means that the column headers don't
line up with their data.

I'm not sure whether this issue is product-specific. Both parties
are using Postgres in this instance.

I've hacked together a workaround for both issues in the above-linked
answer, and that's doing the trick for me, but it would be great if
sql-interaction-mode handled this by default.


-Phil




In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d 
scroll bars)
 of 2015-10-10
Repository revision: bb7c182fdaf8553ffdc9162f322177ae2f7fa0c2
Windowing system distributor 'The X.Org Foundation', version 11.0.11701000
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Message #10 received at 22016 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Phil Sainty <psainty <at> orcon.net.nz>
Cc: Michael Mauger <mmauger <at> protonmail.com>, 22016 <at> debbugs.gnu.org
Subject: Re: bug#22016: 25.0.50; sql-interactive-mode prompts and header
 alignment in query output
Date: Wed, 09 Oct 2019 07:22:59 +0200

Phil Sainty <psainty <at> orcon.net.nz> writes:

> Regarding the following Question and Answer:
>
> http://emacs.stackexchange.com/q/13315
> http://emacs.stackexchange.com/a/18403
>
> In which multi-line SQL queries can result in output like so:
>
> select a, b, c
> from table1
> where a < 10;
>
> mydb=> mydb=> mydb-> mydb-> mydb->     a     |      b       |   c
> ----------+--------------+-------
>         1 | 2015-01-05   | 59120
>         7 | 2015-01-06   | 59121
>         3 | 2015-01-07   | 59122
> (3 rows)
>
> i.e. we get multiple prompts all on a single line (continuations due
> to the multi-line query), and then the header row for the output is
> on that same line as well, which means that the column headers don't
> line up with their data.

Michael sent a control message marking this bug as
unreproducible/moreinfo under the subject "Close bugs", but didn't
actually close the bug reports.  I'm not quite sure what Michael's
intentions were -- Michael, did you want the bug reporter to supply more
information, or did you mean that this bug had been fixed?

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

Message #13 received at 22016 <at> debbugs.gnu.org (full text, mbox):

From: Phil Sainty <psainty <at> orcon.net.nz>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Michael Mauger <mmauger <at> protonmail.com>, 22016 <at> debbugs.gnu.org
Subject: Re: bug#22016: 25.0.50; sql-interactive-mode prompts and header
 alignment in query output
Date: Thu, 10 Oct 2019 10:50:39 +1300

Hi Lars, Michael,

On 2019-10-09 18:22, Lars Ingebrigtsen wrote:
> Michael sent a control message marking this bug as
> unreproducible/moreinfo under the subject "Close bugs", but didn't
> actually close the bug reports.  I'm not quite sure what Michael's
> intentions were -- Michael, did you want the bug reporter to supply
> more information, or did you mean that this bug had been fixed?

Looking at this again... `sql-interactive-remove-continuation-prompt'
used in `comint-preoutput-filter-functions' is presumably intended to
take care of this very problem; and that pre-dates this bug report.

So there may well have been some other contributing factor responsible
for it not working in my case.

The first thing that springs to mind is that the default postgres
prompt regexps do not recognise hyphens, so I was also modifying those
patterns to recognise my hyphenated database names.

The current sql.el postgres defaults are:

     :prompt-regexp "^[[:alnum:]_]*=[#>] "
     :prompt-cont-regexp "^[[:alnum:]_]*[-(][#>] "

My config has:

    ;; Default postgres pattern was: "^\\w*=[#>] " (see 
`sql-product-alist').
    (setq sql-prompt-regexp "^\\(?:\\sw\\|\\s_\\|-\\)*=[#>] ")
    ;; Ditto for continuation prompt: "^\\w*[-(][#>] "
    (setq sql-prompt-cont-regexp "^\\(?:\\sw\\|\\s_\\|-\\)*[-(][#>] "))

I then have the following notes:

    ;; Allow symbol chars and hyphens in database names in prompt.
    ;; TODO: Try to make this *strictly* accurate, in accordance with:
    ;; 
http://www.postgresql.org/docs/current/interactive/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
    ;; (and then submit the fix upstream).  (hmm... hyphens are not
    ;; actually mentioned in that documentation :/ )
    ;;
    ;; SQL identifiers and key words must begin with a letter (a-z,
    ;; but also letters with diacritical marks and non-Latin letters)
    ;; or an underscore (_). Subsequent characters in an identifier or
    ;; key word can be letters, underscores, digits (0-9), or dollar
    ;; signs ($). Note that dollar signs are not allowed in
    ;; identifiers according to the letter of the SQL standard, so
    ;; their use might render applications less portable. The SQL
    ;; standard will not define a key word that contains digits or
    ;; starts or ends with an underscore, so identifiers of this form
    ;; are safe against possible conflict with future extensions of
    ;; the standard.
    ;;
    ;; The system uses no more than NAMEDATALEN-1 bytes of an
    ;; identifier; longer names can be written in commands, but they
    ;; will be truncated. By default, NAMEDATALEN is 64 so the maximum
    ;; identifier length is 63 bytes. If this limit is problematic, it
    ;; can be raised by changing the NAMEDATALEN constant in
    ;; src/include/pg_config_manual.h.


Tracing my own config changes, I can see that I supported symbol chars
in `sql-prompt-regexp' before other changes, however I seemingly
didn't fix this in `sql-prompt-cont-regexp' until the same commit in
which I added my filter.

Potentially that means all I'd ever really needed was for both prompt
regexps to be compatible, but I would need to do some more testing to
figure this out.

It looks like the postgres prompt regexps are still a going concern
for sql.el itself, so that could be up for discussion in the meantime.


-Phil

Message #18 received at 22016-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Michael Mauger <mmauger <at> protonmail.com>
Cc: 22016-done <at> debbugs.gnu.org
Subject: Re: Close bugs
Date: Wed, 12 Aug 2020 18:54:31 -0700

It seems like the intention below was to close this bug.  I'm going to
boldly assume that is correct and close this bug now.

If this conclusion is incorrect, please reply to this email (use "Reply
to all" in your email client) and we can reopen the bug report.

Best regards,
Stefan Kangas

Michael Mauger <mmauger <at> protonmail.com> writes:

> # placeholder
> close 11481 27.0.50
> # missing prompt-cont-regexp handling
> close 24483 27.0.50
> # postgres password prompt
> tag 18066 + unreproducible moreinfo
> tag 18240 + unreproducible moreinfo
> tag 20288 + unreproducible moreinfo
> tag 20289 + unreproducible moreinfo notabug
> tag 23063 + unreproducible moreinfo
> tag 29105 + unreproducible moreinfo
>
> tag 3569 + notabug
> close 3569
>
> close 14759 26.1
>
> tag 15202 + notabug
>
> tag 22016 + unreproducible moreinfo
> close 22106 26.1
>
> close 30247 27.0.50
>
> thank you
>
> --
> MICHAEL <at> MAUGER.COM // FSF and EFF member // GNU Emacs sql.el maintainer

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