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Re: [RFC PATCH] Per-window face support

From: Stefan Monnier
Subject: Re: [RFC PATCH] Per-window face support
Date: Thu, 07 Jun 2018 23:53:51 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

>> Is there any chance we could allow running Elisp code there, i.e. allow
> I thought about that, but I worry that allowing arbitrary code to execute
> there would make any kind of caching invalidation or something much harder
> later.


>> or even just
>>      (:filter FUNCTION)
>> where FUNCTION returns the FACE-SPECIFICATION (or nil, say).
> If we went this route, I'd probably want to call it :eval.

[ Based on the previous point, this might be moot, but it's a problem
  we have in many places in Elisp, so I find it's important to say it:  ]

I don't object to the name :eval BUT the argument should be a *function*
and not an *expression* (i.e. the implementation should involve
`funcall` rather than `eval`).

It's no accident that "eval" and "evil" sound so much alike.


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