Re: RFC: String interpolation

[Clément Pit--Claudel]

On 2016-12-10 10:39, Lars Ingebrigtsen wrote:
> As Ted alluded to, there's a different, template based method that I
> think is more promising and is growing more popular in newer languages.

I don't know: Python has had it for a while, no one uses it, and they are now 
introducing interpolation…

> (with-format ((zot "foo")
>               (thing (funcall '+ 3.42423 4)))
>   "This is %{thing}.2f and %{zot}ss")

This looks fine too, but the repetition bothers me (I don't really see what 
benefit there is to naming all arguments).  So I still find

  "This is %(funcall '+ 3.42423 4).2f and "foo"s"

more readable.

But in any case, what you're suggesting is just a limited form of 
interpolation, right? IIUC it's actually already offered in s.el.  With the fmt 
that I suggested, you'd write this:

(let ((zot "foo")
      (thing (funcall '+ 3.42423 4)))
  (fmt "This is $[%.2s]{thing} and ${zot}s"))

Or would with-format behave differently?

signature.asc
Description: OpenPGP digital signature