[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: (format "Hello %1$S%2$s" 'world "!")
From: |
Noam Postavsky |
Subject: |
Re: (format "Hello %1$S%2$s" 'world "!") |
Date: |
Sun, 2 Jul 2017 12:54:59 -0400 |
On Sun, Jul 2, 2017 at 12:32 PM, Clément Pit-Claudel
<address@hidden> wrote:
>> Why would we need a new function since %n$ would be an error for the old
>> format anyway?
>
> This in itself is a good reason to have a new function. A new function lets
> you migrate existing code, including plugins, to the new syntax, and load the
> polyfill in older Emacsen. A new syntax that causes errors in old Emacsen
> isn't usable by anyone outside of Emacs core, for fear of compatibility
> problems.
We can still give a new name I suppose.
> The ones I'm familiar with use $1, {1}, or similar syntax,
What's the equivalent of %1$d in that syntax? Or is it just strings?
> but I've never seen %1$s :/
It's a POSIX extension to C's printf [1,2], also used by Java [3] and perl [4].
[1]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/printf.html
[2]: https://en.wikipedia.org/wiki/Printf_format_string
[3]: https://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html
[4]: https://perldoc.perl.org/functions/sprintf.html
- Re: prin1 / princ vs message ?, (continued)
- Re: prin1 / princ vs message ?, Philipp Stephani, 2017/07/02
- Re: prin1 / princ vs message ?, Jean-Christophe Helary, 2017/07/02
- (format "Hello %1$S%2$s" 'world "!"), Clément Pit-Claudel, 2017/07/02
- Re: (format "Hello %1$S%2$s" 'world "!"), Jean-Christophe Helary, 2017/07/02
- Re: (format "Hello %1$S%2$s" 'world "!"), Noam Postavsky, 2017/07/02
- Re: (format "Hello %1$S%2$s" 'world "!"), Clément Pit-Claudel, 2017/07/02
- Re: (format "Hello %1$S%2$s" 'world "!"),
Noam Postavsky <=
- Re: (format "Hello %1$S%2$s" 'world "!"), Clément Pit-Claudel, 2017/07/02
- Re: (format "Hello %1$S%2$s" 'world "!"), Vivek Dasmohapatra, 2017/07/02
Re: prin1 / princ vs message ?, Stefan Monnier, 2017/07/02