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Re: Searching for line beginning

From: Basil L. Contovounesios
Subject: Re: Searching for line beginning
Date: Sun, 14 Aug 2022 18:33:00 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Eli Zaretskii [2022-08-13 18:43 +0300] wrote:

> C-a (move-beginning-of-line) does this to find the line's beginning:
>     ;; Move to beginning-of-line, ignoring fields and invisible text.
>     (skip-chars-backward "^\n")
>     (while (and (not (bobp)) (invisible-p (1- (point))))
>       (goto-char (previous-char-property-change (point)))
>       (skip-chars-backward "^\n"))
> Apart of the fields part (which can be handled by binding
> inhibit-field-text-motion), can anyone see a reason why not use
> line-beginning-position instead?  The latter is much faster,
> especially when lines are very long.

FWIW, one could also say (beginning-of-line) or (beginning-of-line 1)
instead of (goto-char (line-beginning-position)).  But they boil down to
the same thing, so they should be very close in terms of performance.



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