GNU bug report logs - #71042
29.3; csv-mode: csv-guess-set-separator chokes on comment lines

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Marco Emilio Poleggi <marcoep <at> ieee.org>
Subject: bug#71042: closed (Re: bug#71042: 29.3; csv-mode: csv-guess-set-separator
 chokes on comment lines)
Date: Sun, 04 Aug 2024 14:37:02 +0000

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

Your bug report

#71042: 29.3; csv-mode: csv-guess-set-separator chokes on comment lines

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 71042 <at> debbugs.gnu.org.

-- 
71042: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=71042
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Philip Kaludercic <philipk <at> posteo.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71042-done <at> debbugs.gnu.org, "Peder O. Klingenberg" <peder <at> klingenberg.no>,
 marcoep <at> ieee.org
Subject: Re: bug#71042: 29.3; csv-mode: csv-guess-set-separator chokes on
 comment lines
Date: Sun, 04 Aug 2024 14:36:05 +0000

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

>> Cc: 71042 <at> debbugs.gnu.org
>> From: "Peder O. Klingenberg" <peder <at> klingenberg.no>
>> Date: Fri, 26 Jul 2024 12:07:00 +0200
>> 
>> On Sat, 2024-05-18 12:14:21 +0200, Marco Emilio Poleggi wrote:
>> 
>> > Comment lines seem well supported by csv-mode. However, function
>> > `csv-guess-set-separator` has troubles with them.
>> 
>> Easily fixed, but needs someone with commit privileges to apply the patch
>
> Thanks.
>
> Philip, could you please install this?

Done, and closing the report.  Note that for some reason the commit
didn't want to apply, but I couldn't figure out why.  Had to reconstruct
the change by hand, so I hope nothing went wrong.

-- 
	Philip Kaludercic on peregrine

[Message part 3 (message/rfc822, inline)]

From: Marco Emilio Poleggi <marcoep <at> ieee.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3; csv-mode: csv-guess-set-separator chokes on comment lines
Date: Sat, 18 May 2024 12:14:21 +0200

[Message part 4 (text/plain, inline)]

Comment lines seem well supported by csv-mode. However, function 
`csv-guess-set-separator` has troubles with them.

Visit this input file:

-------------------------8<-----------------------
$ cat >csv-test.csv <<EOF
###
###
Foo;Bar;Quux
123;456;blah, blah
EOF
------------------------->8-----------------------

With no special settings, the default comma (',') separator is
detected.

Now, issue `M-x csv-guess-set-separator`: I'd expect that the effective
semicolon (';') separator is detected. But it's not and instead the hash
('#') is detected, as confirmed by `C-h v csv-separators`.

It looks like csv-guess-set-separator is fooled by the first two lines
with an even number of hash characters. Indeed, breaking that symmetry
makes the ';' detectable.

But, hey, csv-mode says:

;; CSV mode commands ignore blank lines and comment lines beginning
;; with the value of the buffer local variable `csv-comment-start',
;; which by default is #. ...

So there's probably a bug in `csv-guess-set-separator`.

Cheers,

  Marco



--------------------------------------------------------------------------------

In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
 cairo version 1.18.0) of 2024-05-14 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
System Description: Gentoo Linux

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