Re: master fe7c015b20: Support XFCE in wallpaper.el

[Visuwesh]

[செவ்வாய் செப்டம்பர் 27, 2022] Stefan Kangas wrote:

> Could we change `format-spec' to accept functions in the substitutions,
> that are then only called when actually needed?

+1. I was thinking of raising such a proposal myself.  It seems wasteful to
pre-calculate all the specifications instead of lazily evaluating them.

>
> For example, from its docstring:
>
>   (format-spec "su - %u %l"
>                `((?u . ,(user-login-name))
>                  (?l . "ls")))
>
> Could then instead be:
>
>   (format-spec "su - %u %l"
>                `((?u . #'user-login-name)
>                  (?l . "ls")))
>
> Perhaps we should hide that behind a new optional argument though.