GNU bug report logs - #44597
26.3; bibtex should allow reverse sorting

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Package: emacs; Reported by: Francesco Potortì <pot@HIDDEN>; dated Thu, 12 Nov 2020 18:31:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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To: Francesco =?utf-8?Q?Potort=C3=AC?= <pot@HIDDEN>
Subject: Re: bug#44597: 26.3; bibtex should allow reverse sorting
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In-Reply-To: <E1kdzOQ-00G9cu-G7@HIDDEN> ("Francesco
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 Content preview:  Francesco Potortì <pot@HIDDEN> writes: > Ideally, bibtex.el
    should provide a hook where one can install any > function for sorting. The
    hook should get some arguments (the type of > entry, the name of entry, the
    date, a bibtex custom field [...] 
 
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Francesco Potort=C3=AC <pot@HIDDEN> writes:

> Ideally, bibtex.el should provide a hook where one can install any
> function for sorting.  The hook should get some arguments (the type of
> entry, the name of entry, the date, a bibtex custom field and maybe
> others).  That would make bibtex.el more generally flexible.

Yes, I think introducing a variable to control the sorting would be a
good idea.  It'd default to `bibtex-lessp' (or rather, something that
does the same), but (as you say) have an input that makes implementing
other sorting functions easier.

Patches welcome.  :-)

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#44597; Package emacs. Full text available.

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To: Lars Ingebrigtsen <larsi@HIDDEN>
In-reply-to: <87ima7yjp7.fsf@HIDDEN> (larsi@HIDDEN)
Subject: Re: bug#44597: 26.3; bibtex should allow reverse sorting
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>> I wish bibtex mode would allow for reverse sorting of entries.
>>
>> Some years ago I used to obtain that behaviour by advising the sort-subr
>> functions when called inside a bibtex-mode buffer.  No more.
>>
>> The modern bibtex.el sorts an entry when bibtex-clean-entry is called
>> when bibtex-maintain-sorted-entries is t without calling sort-subr, but
>> relying only on bibtex-lessp, which is not easy to advice.
>
>I haven't looked at the code closely, but wouldn't advising bibtex-lessp
>to just swap the parameters work?

Yes.  In fact, after writing my bug report I looked at the code again
and I did just that :)

However, I think that reversing the sorting order is just the most
common of various criteria that one would like to use for sorting.
Recently I had a reason for getting one hundred bibtex entries sorted by
date in reverse order, a task that would take a long time by hand,
especially in front of frequent modifications of the list of entries to
be sorted.

Fortunately I was able to use bibtex2html to do the job, but the most
natural thing would have been to use bibtex.el with a proper sorting
function.  Ideally, bibtex.el should provide a hook where one can
install any function for sorting.  The hook should get some arguments
(the type of entry, the name of entry, the date, a bibtex custom field
and maybe others).  That would make bibtex.el more generally flexible.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#44597; Package emacs. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Francesco =?utf-8?Q?Potort=C3=AC?= <pot@HIDDEN>
Subject: Re: bug#44597: 26.3; bibtex should allow reverse sorting
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 Content preview:  Francesco Potortì <pot@HIDDEN> writes: > I wish bibtex mode
    would allow for reverse sorting of entries. > > Some years ago I used to
   obtain that behaviour by advising the sort-subr > functions when called inside
    a bibtex-mode buffer. No mo [...] 
 
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Francesco Potort=C3=AC <pot@HIDDEN> writes:

> I wish bibtex mode would allow for reverse sorting of entries.
>
> Some years ago I used to obtain that behaviour by advising the sort-subr
> functions when called inside a bibtex-mode buffer.  No more.
>
> The modern bibtex.el sorts an entry when bibtex-clean-entry is called
> when bibtex-maintain-sorted-entries is t without calling sort-subr, but
> relying only on bibtex-lessp, which is not easy to advice.

I haven't looked at the code closely, but wouldn't advising bibtex-lessp
to just swap the parameters work?

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#44597; Package emacs. Full text available.

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Subject: 26.3; bibtex should allow reverse sorting
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I wish bibtex mode would allow for reverse sorting of entries.

Some years ago I used to obtain that behaviour by advising the sort-subr
functions when called inside a bibtex-mode buffer.  No more.

The modern bibtex.el sorts an entry when bibtex-clean-entry is called
when bibtex-maintain-sorted-entries is t without calling sort-subr, but
relying only on bibtex-lessp, which is not easy to advice.

I have numbered labels, and I want them to stay in reverse order as they
are, but now I can get that behaviour only by setting
bibtex-maintain-sorted-entries to nil

Please add some way to reverse the order of entries

--
fp
Acknowledgement sent to Francesco Potortì <pot@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#44597; Package emacs. Full text available.
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