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bug#46088: 26.3; doc string of `read-regexp'
From: |
Lars Ingebrigtsen |
Subject: |
bug#46088: 26.3; doc string of `read-regexp' |
Date: |
Wed, 27 Jan 2021 03:37:51 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Drew Adams <drew.adams@oracle.com> writes:
> A. This is unclear, to me:
>
> If DEFAULTS is a non-nil symbol, then if `read-regexp-defaults-function'
> is non-nil, we use that in place of DEFAULTS in the following:
> If DEFAULTS is the symbol `regexp-history-last', we use the first
> element of HISTORY (if specified) or `regexp-history'.
> If DEFAULTS is a function, we call it with no arguments and use
> what it returns, which should be either nil, a string, or a list of
> strings.
That is pretty hard to parse, but the semantics are pretty convoluted,
too. It's saying that if DEFAULTS is a symbol, then the actual value
used comes from `read-regexp-defaults-function' in the two cases
described. That is, if `read-regexp-defaults-function' is non-nil.
I've now tried to reformulate this in Emacs 28, but it's a case of the
code being easier to read than trying to actually describe the semantics.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no