From: Jambunathan K <kjambunathan@gmail.com>
To: "Drew Adams" <drew.adams@oracle.com>
Cc: 13687@debbugs.gnu.org
Subject: bug#13687: /srv/bzr/emacs/trunk r111878: * lisp/replace.el(read-regexp): Let-bind `default' to the first
Date: Sat, 09 Mar 2013 00:33:56 +0530 [thread overview]
Message-ID: <87obetww6b.fsf@gmail.com> (raw)
In-Reply-To: <812C4DC04A0D46B8AC5B11170E06A75C@us.oracle.com> (Drew Adams's message of "Fri, 8 Mar 2013 10:53:54 -0800")
Suspend your judgement. I don't like to discuss (or rather I cannot
discuss) in abstract. It is so error prone. I will show my wares
tomorrow.
"Drew Adams" <drew.adams@oracle.com> writes:
>> > E.g., in the code I cited, if a user does not want the same
>> > defaulting behavior for commands `occur', `how-many', etc.,
>> > she can set option `search/replace-default-fn' to a function
>> > that distinguishes them (e.g., using `this-command', as
>> > Jambunathan suggested).
>>
>> Interesting suggestion there.
>>
>> This makes me think that there is no need for multiple
>> `hi-lock-read-regexp-defaults-function' and a separate
>> `occur-read-regexp-defaults-function' etc. But a single
>> `read-regexp-defaults-function' that cases on `this-command'.
>
> The question, as I said, is whether it makes sense, for the particular commands
> that we group to use the same option, to provide the default regexp (or other
> string) in the same way.
>
> I can't speak to whether that is the case for hi-lock, occur, etc. But if it is
> true, then yes, a single option for such a group of commands makes sense.
>
>> The function can return a symbol token like `t' for
>> `this-command's which it doesn't want to meddle with but
>> return nil or a regexp or list of regexps for commands it
>> wants to insinuate.
>
> That is not what I suggested. I suggested that the option value be a function
> that returns a string to use as the default value when reading user input.
>
> What I said in the passage you cite is that that function (the value of the
> option) could, if the user so wants, itself test `this-command' and provide a
> different string depending on the current command.
>
>> Is there any problem with this
>> `read-regexp-defaults-function' approach?
>
> I think you're suggesting that the option value be a function that returns t or
> nil, instead of returning a default-value string. It's not clear to me how a
> given command such as `occur' would make use of that Boolean return value.
>
> As I noted before, I would not _encourage_ users to use a dispatching function
> as the option value, but that would not (could not) be prevented. They can do
> anything they want using any function they want.
>
> The out-of-the-box design should make a reasonable assumption about which
> commands to group (i.e., which should use the same option).
>
> If it is expected that some command that reads a regexp would generally be
> better off with a different defaulting behavior, then that command should not
> use the group option. It could use its own, similar option, with a different
> default option value (a different default-value-providing function). Or it
> could hard-code its defaulting, or whatever.
>
> The use of a function to dispatch according to the current command should be
> exceptional, IMO - only a fallback possibility and not something to be
> encouraged.
next prev parent reply other threads:[~2013-03-08 19:03 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1UA5QC-0006Vm-Qb@vcs.savannah.gnu.org>
[not found] ` <877glsyecw.fsf@gmail.com>
2013-02-28 18:12 ` bug#13687: /srv/bzr/emacs/trunk r111878: * lisp/replace.el (read-regexp): Let-bind `default' to the first Juri Linkov
2013-03-03 9:31 ` Juri Linkov
2013-03-06 18:00 ` Jambunathan K
2013-03-08 13:02 ` Jambunathan K
2013-03-08 15:29 ` bug#13687: /srv/bzr/emacs/trunk r111878: * lisp/replace.el(read-regexp): " Drew Adams
2013-03-08 16:53 ` Jambunathan K
2013-03-08 17:10 ` Drew Adams
2013-03-08 17:27 ` Jambunathan K
2013-03-08 17:28 ` Juri Linkov
2013-03-08 18:16 ` Drew Adams
2013-03-08 18:30 ` Jambunathan K
2013-03-08 18:53 ` Drew Adams
2013-03-08 19:03 ` Jambunathan K [this message]
2013-03-08 21:08 ` Drew Adams
2013-03-09 8:47 ` Jambunathan K
2013-03-09 15:08 ` Drew Adams
2013-03-09 16:21 ` Jambunathan K
2013-03-09 16:37 ` Drew Adams
2013-03-09 16:59 ` Jambunathan K
2013-03-09 17:14 ` Drew Adams
2013-03-09 17:25 ` Jambunathan K
2013-03-09 17:55 ` Drew Adams
2013-03-10 18:28 ` Juri Linkov
2013-03-18 7:24 ` Jambunathan K
2013-03-04 5:46 ` bug#13687: /srv/bzr/emacs/trunk r111878: * lisp/replace.el (read-regexp): " Jambunathan K
2013-03-04 9:28 ` Juri Linkov
2013-03-06 18:03 ` Jambunathan K
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