From: Vivek Dasmohapatra <vivek@etla.org>
To: "Clément Pit-Claudel" <cpitclaudel@gmail.com>
Cc: Emacs developers <emacs-devel@gnu.org>,
Noam Postavsky <npostavs@users.sourceforge.net>
Subject: Re: (format "Hello %1$S%2$s" 'world "!")
Date: Sun, 2 Jul 2017 17:56:43 +0100 (BST) [thread overview]
Message-ID: <alpine.DEB.2.02.1707021747250.31053@platypus.pepperfish.net> (raw)
In-Reply-To: <f16415e8-7aad-cd2a-0d4a-2fa3840515a0@gmail.com>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 785 bytes --]
> Also, the syntax is very heavy. Was it inspired by another programming
> language? The ones I'm familiar with use $1, {1}, or similar syntax, but
> I've never seen %1$s :/
From printf(3):
By default, the arguments are used in the order given, …
One can also specify explicitly which argument is taken, at each place
where an argument is required, by writing "%m$" instead of '%' and "*m$"
instead of '*', where the decimal integer m denotes the position in the
argument list of the desired argument, indexed starting from 1. Thus,
printf("%*d", width, num);
and
printf("%2$*1$d", width, num);
https://en.wikipedia.org/wiki/Printf_format_string#Parameter_field
I don't know when POSIX introduced it, but it's been around for a while.
next prev parent reply other threads:[~2017-07-02 16:56 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-02 10:12 prin1 / princ vs message ? Jean-Christophe Helary
2017-07-02 11:57 ` Tino Calancha
2017-07-02 12:21 ` Jean-Christophe Helary
2017-07-02 12:32 ` Andreas Schwab
2017-07-02 12:41 ` Jean-Christophe Helary
2017-07-02 12:44 ` Tino Calancha
2017-07-02 12:45 ` Noam Postavsky
2017-07-02 13:09 ` Jean-Christophe Helary
2017-07-02 13:17 ` Noam Postavsky
2017-07-02 13:21 ` Tino Calancha
2017-07-02 13:47 ` Jean-Christophe Helary
2017-07-02 14:02 ` Jean-Christophe Helary
2017-07-02 14:23 ` Tino Calancha
2017-07-02 14:26 ` Jean-Christophe Helary
2017-07-02 14:27 ` Philipp Stephani
2017-07-02 14:38 ` Jean-Christophe Helary
2017-07-02 14:30 ` (format "Hello %1$S%2$s" 'world "!") Clément Pit-Claudel
2017-07-02 14:39 ` Jean-Christophe Helary
2017-07-02 15:03 ` Noam Postavsky
2017-07-02 16:32 ` Clément Pit-Claudel
2017-07-02 16:54 ` Noam Postavsky
2017-07-02 17:25 ` Clément Pit-Claudel
2017-12-22 21:50 ` Philipp Stephani
2017-07-02 16:56 ` Vivek Dasmohapatra [this message]
2017-12-22 21:48 ` Philipp Stephani
2017-12-22 21:44 ` Philipp Stephani
2017-07-02 14:29 ` prin1 / princ vs message ? Stefan Monnier
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