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Re: Electric indentation sub-optimality and resolution

From: Óscar Fuentes
Subject: Re: Electric indentation sub-optimality and resolution
Date: Fri, 19 Dec 2014 02:08:34 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

John Yates <address@hidden> writes:

> On Thu, Dec 18, 2014 at 3:07 PM, Dmitry Gutov <address@hidden> wrote:
>> Personally, I like this lighter-weight approach:
>> https://github.com/purcell/whitespace-cleanup-mode
> In my case I have show-trailing-whitespace set and my trailing-whitespace
> face is "red3".  That made it very painful to insert blank lines in the
> presence of cc-mode's new electric indentation, even when some other
> mechanism / package / mode ultimately was going to clean things up
> (assuming I saved the file).  Until I did a save my new electric whitespace
> messes were "in my face".

I had a similar setup here, but after using ws-butler it made no sense
anymore, since that package ensures that the file does not end with
newly added trailing whitespace.

> Steve Purcell's approach works only if one's file is pristine.

Yes, that disqualifies his package for me.

> Prior to
> the introduction of electric indentation I had no need of such a package: I
> was careful not to introduce inappropriate whitespace.  But since I
> regularly have to work on files where other people have been less
> fastidious Steve's package would not clean these electric whitespace messes.
> I actually really like the behavior of the code I posted.  It has an added
> small bonus.  Normally it does not cleanup pre-existing whitespace.  When I
> modify a line with trailing whitespace it does cleanup that one line,
> something my projects' guidelines allow.

That's what ws-butler does.

OTOH, your code is ok for adding it to the user's personal .emacs, but
not for incorporation into Emacs. The code should be made into a minor
mode or an optional feature of electric-indent-mode. Creating a new
minor mode makes more sense, IMO.

Anyways, we need to hear the opinion of the author of ws-butler package.
AFAIK he tried a similar approach to yours and found problems with it.

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