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From: | Dmitry Gutov |
Subject: | bug#58950: [PATCH] * lisp/subr.el (buffer-match-p): Optimise performance |
Date: | Fri, 6 Jan 2023 23:41:43 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 |
On 06/01/2023 13:17, Mattias Engdegård wrote:
5 jan. 2023 kl. 13.55 skrev Dmitry Gutov <dgutov@yandex.ru>:I'm not sure how we'd reach the same goals with plain old Elisp (structured editing in particular -- in Customize).No enemy of little DSLs in principle but is that structural editing the main rationale now?
I think so? And the fact that it's more limited than Elisp means the values have to be uniform-ish. As a result they're easier to quickly grasp.
(I wish we had (byte-)compiled elisp functions carrying their own source, either as s-exp, string of formatted source text, or source file reference -- that would allow for sensible editing in Customise without performance penalty. But Santa gave me a wool jumper instead, that's nice too.)
We kind of have that already, if we just made the type for be 'sexp', or a Lisp form. With all the freedom associated with it, just lower performance compared to a compiled function.
Would that look like a good choice for e.g. font-lock-global-modes? I don't think the performance hit would be a problem for that use.
Regarding buffer-match-p, the fact that `not` actually means `nor` is a bit odd (we don't do that elsewhere), as well as arbitrary (why not `nand` etc) and undocumented.
Yeah, it's a wrinkle. I'm on the fence regarding changing it, though, for compatibility and ergonomical reasons (it's easier for the user to avoid typing a dot).
But I'm not married to it either.
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