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Re: [RFC] Do indent-region only on editable buffers

From: Stefan Monnier
Subject: Re: [RFC] Do indent-region only on editable buffers
Date: Mon, 07 Aug 2017 15:55:17 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

> The proposal is to call (barf-if-buffer-read-only) before attempting to do
> the indent.

No objection here.

> change is required? Here's what's will happen: 1. User: Try indentation
> (C-x h M-x indent-region) 2. User: Could take several seconds or few
> minutes (depending on major mode and file size) 3. Emacs: "Bummer, couldn't
> save all that indentation because the buffer is read-only". 4. User: Make

Indentation of a region isn't done by computing the complete result and
then "saving" it into the buffer.  So the error will be signaled as soon
as the indent-region finds a line whose indentation should be changed.
Usually that's almost instantaneous, but indeed in some cases it can
take a while (e.g. in large regions that are already indented except for
the last few lines).


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