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bug#25461: [Patch]: Missing doc strings for "," and ",@".
From: |
Alan Mackenzie |
Subject: |
bug#25461: [Patch]: Missing doc strings for "," and ",@". |
Date: |
Thu, 19 Jan 2017 18:36:39 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
Hello, Noam.
On Thu, Jan 19, 2017 at 01:10:24PM -0500, Noam Postavsky wrote:
> 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.
[ .... ]
> I agree backquote is the primary use, it's reasonable to emphasize that.
> Because "," isn't a macro, it doesn't have any semantics. It's
^^^^
> misleading to suggest that it does.
We could degenerate into a long silly discussion about what "have" means.
, evaluates the form it precedes, and inserts it into the containing
list. That's semantics enough for me.
> >> > +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.
OK, I've toned down that part of the doc string. (See below.)
> * `use-package' once handled unmatched "," as signifying eager
> evaluation, but it no longer does that.
How about this, then:
"`,' signals that the next form should be evaluated and inserted.
It occurs in `\\=`' constructs.
For example:
b => (ba bb bc) ; assume b has this value
\\=`(a ,b c) => (a (ba bb bc) c) ; insert the value of b
See also `\\=`' and `,@'.
(Note that ``' constructs (including `,'s) sometimes have different
semantics. This occurs, for example, with the macro `pcase' and other
macros with similar names.)
?
--
Alan Mackenzie (Nuremberg, Germany).
- bug#25461: Missing doc strings for "," and ",@"., (continued)
- bug#25461: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/17
- bug#25461: Missing doc strings for "," and ",@"., Andreas Schwab, 2017/01/17
- bug#25461: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/17
- bug#25461: Missing doc strings for "," and ",@"., Andreas Schwab, 2017/01/17
- bug#25461: Missing doc strings for "," and ",@"., Michael Heerdegen, 2017/01/17
- bug#25461: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/18
Message not available
- bug#25461: [Patch]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/18
- bug#25461: [Patch]: Missing doc strings for "," and ",@"., npostavs, 2017/01/18
- bug#25461: [Patch]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/19
- bug#25461: [Patch]: Missing doc strings for "," and ",@"., Noam Postavsky, 2017/01/19
- bug#25461: [Patch]: Missing doc strings for "," and ",@".,
Alan Mackenzie <=
- bug#25461: [Patch]: Missing doc strings for "," and ",@"., Michael Heerdegen, 2017/01/19
bug#25461: [Patch]: Missing doc strings for "," and ",@"., Michael Heerdegen, 2017/01/18
bug#25461: [Patch]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/19
bug#25461: [Patch]: Missing doc strings for "," and ",@"., Michael Heerdegen, 2017/01/19
bug#25461: [Patch]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/20
bug#25461: [Patch]: Missing doc strings for "," and ",@"., Michael Heerdegen, 2017/01/20
bug#25461: [Patch]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/21
bug#25461: [Patch #2]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/21
bug#25461: [Patch #2]: Missing doc strings for "," and ",@"., Michael Heerdegen, 2017/01/23
bug#25461: [Patch #2]: Missing doc strings for "," and ",@"., Alan Mackenzie, 2017/01/24