* bug#18088: 24.4.50; `region-extract-function': (1) NEWS, (2) return value
@ 2014-07-23 16:04 Drew Adams
2016-04-29 22:31 ` Lars Ingebrigtsen
0 siblings, 1 reply; 2+ messages in thread
From: Drew Adams @ 2014-07-23 16:04 UTC (permalink / raw
To: 18088
Variable `region-extract-function' was apparently added in Emacs 24.4.
It is used in several key places that affect killing or deleting text.
1. It should be called out in NEWS, saying what user-visible behavior
its presence changes.
2. The doc string points out that, depending on the value of its
argument, its return value is (a) significant and specified or (b)
insignificant and undefined.
This is the first time I have seen this for an Emacs function
distributed with GNU Emacs. Certainly it is the first time I've
seen such odd behavior documented.
This does NOT seem like the kind of thing we should be doing - let
alone *encouraging* by defining a variable whose value will be
user-defined functions that have such twisted behavior.
Is this unusual design necessary? Seems to be sloppy, error prone,
and an invitation to bad programming habits by users.
In GNU Emacs 24.4.50.1 (i686-pc-mingw32)
of 2014-06-28 on ODIEONE
Bzr revision: 117431 rgm@gnu.org-20140628015517-eku6hj8mpgcvfnso
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
`configure --prefix=/c/Devel/emacs/snapshot/trunk
--enable-checking=yes,glyphs 'CFLAGS=-O0 -g3'
LDFLAGS=-Lc:/Devel/emacs/lib 'CPPFLAGS=-DGC_MCHECK=1
-Ic:/Devel/emacs/include''
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#18088: 24.4.50; `region-extract-function': (1) NEWS, (2) return value
2014-07-23 16:04 bug#18088: 24.4.50; `region-extract-function': (1) NEWS, (2) return value Drew Adams
@ 2016-04-29 22:31 ` Lars Ingebrigtsen
0 siblings, 0 replies; 2+ messages in thread
From: Lars Ingebrigtsen @ 2016-04-29 22:31 UTC (permalink / raw
To: Drew Adams; +Cc: 18088
Drew Adams <drew.adams@oracle.com> writes:
> Variable `region-extract-function' was apparently added in Emacs 24.4.
> It is used in several key places that affect killing or deleting text.
>
> 1. It should be called out in NEWS, saying what user-visible behavior
> its presence changes.
>
> 2. The doc string points out that, depending on the value of its
> argument, its return value is (a) significant and specified or (b)
> insignificant and undefined.
>
> This is the first time I have seen this for an Emacs function
> distributed with GNU Emacs. Certainly it is the first time I've
> seen such odd behavior documented.
>
> This does NOT seem like the kind of thing we should be doing - let
> alone *encouraging* by defining a variable whose value will be
> user-defined functions that have such twisted behavior.
>
> Is this unusual design necessary? Seems to be sloppy, error prone,
> and an invitation to bad programming habits by users.
It seems like a quite complicated thing, but as it has been in a release
now, I think it's too late to do anything about that.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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2014-07-23 16:04 bug#18088: 24.4.50; `region-extract-function': (1) NEWS, (2) return value Drew Adams
2016-04-29 22:31 ` Lars Ingebrigtsen
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