From: Noam Postavsky <npostavs@users.sourceforge.net>
To: Alan Mackenzie <acm@muc.de>
Cc: 25461@debbugs.gnu.org
Subject: bug#25461: [Patch]: Missing doc strings for "," and ",@".
Date: Thu, 19 Jan 2017 13:10:24 -0500 [thread overview]
Message-ID: <CAM-tV-9jQd9Vta-HOsS9NZuLWu4O5=s2z4tNJ0Lr_6hLYCMYug@mail.gmail.com> (raw)
In-Reply-To: <20170119173728.GA3397@acm.fritz.box>
On Thu, Jan 19, 2017 at 12:37 PM, Alan Mackenzie <acm@muc.de> wrote:
>
>> > +;; Give `,' and `,@' documentation strings which can be examined by C-h f.
>> > +(put '\, 'function-documentation
>> > + "`,' signals that the next form should be evaluated and inserted.
>
>> This conflates the reader macro with its particular use by the backquote
>> macro.
>
> The use by backquote isn't "a particular" use, as though there were
> several equally valid uses. This use is the prime one, and up until
> fairly recently the only one. Other uses are subsidiary (and I make
> reference to the other one lower down).
I agree backquote is the primary use, it's reasonable to emphasize that.
>
>> I think it's better to explain only the reader macro here, and
>> link to ` and pcase for more details.
>
> In other words, omit the semantics from the doc string. I don't think
> that's a good idea: "This macro transforms `foo' into ....., but you'll
> have to look up ..... to see what it actually does.". We don't do that
> for macros like `when' and `unless', or any others I can think of, so
> why do it for ,?
Because "," isn't a macro, it doesn't have any semantics. It's
misleading to suggest that it does.
>
>> > +It can occur only in `\\=`' constructs.
>
>> This isn't true.
>
> In what sense is it not true? I've never seen a comma used otherwise in
> a lisp program. What misunderstanding could it cause in a (relatively
> new) Lisp hacker reading it?
In the sense that it's possible to write a macro that could treat the
"," differently. I don't know of any that currently do*, but that's
just convention and should be documented as such.
* `use-package' once handled unmatched "," as signifying eager
evaluation, but it no longer does that.
next prev parent reply other threads:[~2017-01-19 18:10 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-16 21:22 bug#25461: Missing doc strings for "," and ",@" Alan Mackenzie
2017-01-17 19:34 ` Glenn Morris
2017-01-17 19:56 ` Alan Mackenzie
2017-01-17 20:36 ` Andreas Schwab
2017-01-17 20:41 ` Alan Mackenzie
2017-01-17 20:53 ` Andreas Schwab
2017-01-18 1:44 ` Michael Heerdegen
2017-01-18 19:28 ` Alan Mackenzie
[not found] ` <handler.25461.B.148460180922707.ack@debbugs.gnu.org>
2017-01-18 19:43 ` bug#25461: [Patch]: " Alan Mackenzie
2017-01-19 0:16 ` npostavs
2017-01-19 17:37 ` Alan Mackenzie
2017-01-19 18:10 ` Noam Postavsky [this message]
2017-01-19 18:36 ` Alan Mackenzie
2017-01-20 0:24 ` Michael Heerdegen
2017-01-19 2:23 ` Michael Heerdegen
2017-01-19 17:58 ` Alan Mackenzie
2017-01-20 0:12 ` Michael Heerdegen
2017-01-20 16:58 ` Alan Mackenzie
2017-01-21 2:26 ` Michael Heerdegen
2017-01-21 15:56 ` Alan Mackenzie
2017-01-21 20:46 ` bug#25461: [Patch #2]: " Alan Mackenzie
2017-01-24 1:58 ` Michael Heerdegen
2017-01-24 19:43 ` Alan Mackenzie
2017-01-24 4:01 ` npostavs
2017-01-24 19:39 ` Alan Mackenzie
2017-01-24 20:00 ` Noam Postavsky
2017-01-23 19:09 ` bug#25461: [Patch]: " Alan Mackenzie
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