From: Ted Zlatanov <tzz@lifelogs.com>
To: emacs-devel@gnu.org
Subject: Re: RFC: String interpolation
Date: Fri, 09 Dec 2016 14:19:37 -0500 [thread overview]
Message-ID: <8737hwnc52.fsf@lifelogs.com> (raw)
In-Reply-To: 51825111-ace4-f750-4077-026a3b648d27@gmail.com
On Wed, 7 Dec 2016 20:13:41 -0500 Clément Pit--Claudel <clement.pit@gmail.com> wrote:
CP> With the attached fmt.el, you can write things like this:
CP> (let ((a 12) (b 15))
CP> (fmt "$a + $b = $(+ a b)"))
CP> ⇒ "12 + 15 = 27"
...
CP> (fmt "Welcome to Emacs! "
CP> "Press $[where-is]{'help-with-tutorial} to open the tutorial.")
CP> ⇒ "Welcome to Emacs! Press C-h t to open the tutorial."
I'd rather see either something like Mustache templates or simply using
the format-spec.el that comes with Emacs. The advantage in my opinion
(informed by many years of using Perl, where string interpolation is a
way of life) is that clarity is improved by separating the format spec
from the data that fills it out, and it's very tempting to stuff logic
into strings but maintenance is unpleasant.
format-spec examples of the two usages quoted:
(let ((a 12) (b 15))
(format-spec "%a + %b = %u" (format-spec-make ?a a
?b b
?u (+ a b)))
(format-spec "Welcome to Emacs! Press %w to open the tutorial"
(format-spec-make ?w (with-temp-buffer
(where-is 'help-with-tutorial t)
(buffer-string))))
CP> (fmt "Today is $[date|%Y-%m-%d](current-time).")
CP> ⇒ "Today is 2016-12-07."
I see no advantage to this versus `format-time-string'. It's ambiguous
and the time zone can't be specified without making it more complicated.
This one in particular is heading in the direction of the way Ansible
integrates Jinja templates, which I think is not great compared to a
more Lispy approach.
Ted
next prev parent reply other threads:[~2016-12-09 19:19 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-08 1:13 RFC: String interpolation Clément Pit--Claudel
2016-12-08 8:27 ` Andreas Schwab
2016-12-08 8:38 ` Joost Kremers
2016-12-08 9:05 ` Philippe Vaucher
2016-12-08 18:25 ` Clément Pit--Claudel
2016-12-08 9:02 ` Philippe Vaucher
2016-12-08 18:22 ` Clément Pit--Claudel
2016-12-08 14:43 ` Joost Kremers
2016-12-08 18:37 ` Clément Pit--Claudel
2016-12-08 20:04 ` Stefan Monnier
2016-12-09 8:57 ` Joost Kremers
2016-12-08 15:51 ` Drew Adams
2016-12-08 18:21 ` Clément Pit--Claudel
2016-12-08 20:38 ` Richard Stallman
[not found] ` <<E1cF5SK-0000HO-EL@fencepost.gnu.org>
2016-12-08 22:04 ` Drew Adams
2016-12-08 19:05 ` Stefan Monnier
2016-12-08 19:31 ` Clément Pit--Claudel
2016-12-08 21:31 ` Stefan Monnier
2016-12-10 16:01 ` Clément Pit--Claudel
2016-12-09 19:19 ` Ted Zlatanov [this message]
2016-12-09 22:45 ` Clément Pit--Claudel
2016-12-11 2:53 ` Ted Zlatanov
2016-12-11 18:46 ` Lars Ingebrigtsen
2016-12-11 18:56 ` Clément Pit--Claudel
2016-12-11 19:34 ` Lars Ingebrigtsen
2016-12-11 17:38 ` Stefan Monnier
2016-12-11 17:53 ` Clément Pit--Claudel
2016-12-10 14:11 ` Lars Ingebrigtsen
2016-12-10 14:25 ` Clément Pit--Claudel
2016-12-10 15:39 ` Lars Ingebrigtsen
2016-12-10 15:49 ` Clément Pit--Claudel
2016-12-10 16:01 ` Yuri Khan
2016-12-10 17:58 ` Clément Pit--Claudel
2016-12-11 17:47 ` Stefan Monnier
2016-12-11 19:31 ` Yuri Khan
2016-12-11 20:12 ` Stefan Monnier
2016-12-11 9:35 ` Richard Stallman
2016-12-11 16:29 ` Clément Pit--Claudel
2016-12-11 18:42 ` Lars Ingebrigtsen
2016-12-12 19:41 ` Richard Stallman
2016-12-11 18:41 ` Lars Ingebrigtsen
2016-12-11 21:05 ` Helmut Eller
2016-12-11 21:26 ` Lars Ingebrigtsen
2016-12-12 2:39 ` Stefan Monnier
2016-12-12 9:44 ` Lars Ingebrigtsen
2016-12-12 13:03 ` Stefan Monnier
2016-12-12 14:47 ` Lars Ingebrigtsen
2016-12-12 15:04 ` Stefan Monnier
2016-12-12 15:26 ` Lars Ingebrigtsen
2016-12-12 17:05 ` Stefan Monnier
2016-12-12 17:12 ` Lars Ingebrigtsen
2016-12-12 17:23 ` Stefan Monnier
2016-12-12 13:40 ` Clément Pit--Claudel
2016-12-12 14:43 ` Lars Ingebrigtsen
2016-12-12 14:54 ` Clément Pit--Claudel
2016-12-12 17:14 ` Stefan Monnier
2016-12-12 17:46 ` Paul Eggert
2016-12-12 18:33 ` Lars Ingebrigtsen
2016-12-12 19:51 ` Ted Zlatanov
2016-12-12 20:41 ` Paul Eggert
2016-12-12 23:40 ` Paul Eggert
2016-12-13 17:42 ` Richard Stallman
2016-12-13 18:05 ` Paul Eggert
2016-12-13 23:55 ` Lars Ingebrigtsen
2016-12-14 0:07 ` Paul Eggert
2016-12-14 0:10 ` John Wiegley
2016-12-14 0:14 ` Lars Ingebrigtsen
2016-12-14 0:17 ` Paul Eggert
2016-12-14 0:26 ` John Wiegley
2016-12-14 1:48 ` Drew Adams
2016-12-14 2:48 ` Elias Mårtenson
2016-12-14 3:33 ` Drew Adams
2016-12-14 3:52 ` Elias Mårtenson
2016-12-14 13:52 ` Lars Brinkhoff
2016-12-14 13:57 ` Lars Brinkhoff
2016-12-14 0:24 ` Drew Adams
2016-12-14 0:21 ` Clément Pit--Claudel
2016-12-14 14:10 ` Lars Ingebrigtsen
2016-12-14 17:00 ` Richard Stallman
2016-12-12 19:43 ` Richard Stallman
2016-12-12 21:11 ` Lars Ingebrigtsen
2016-12-13 17:41 ` Richard Stallman
2016-12-13 17:43 ` Lars Ingebrigtsen
2016-12-14 17:01 ` Richard Stallman
2016-12-13 1:04 ` Ted Zlatanov
2016-12-12 16:39 ` Helmut Eller
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