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bug#10383: 24.0.91; (prefer-coding-system 'utf-8-with-signature) breaks
From: |
Kenichi Handa |
Subject: |
bug#10383: 24.0.91; (prefer-coding-system 'utf-8-with-signature) breaks the world |
Date: |
Wed, 28 Dec 2011 17:07:43 +0900 |
In article
<CAHZoxq8wxViADRk+rgq5eWEwNcB8FV-F5sxbZLjqjfMtDwgVOg@mail.gmail.com>, Eric
Hanchrow <eric.hanchrow@gmail.com> writes:
> Type the following in *scratch*, then C-x C-e:
> (prefer-coding-system 'utf-8-with-signature)
> Now type C-x d.
> You'll see an error:
> Cannot open load file: dired
> You will soon find that your emacs is entirely broken, since no files
> can be loaded.
This is because utf-8-with-signature is recognized as ASCII
compatible and thus default-file-coding-system is also set
to it. I've just committed a fix to make
utf-8-with-signature not ASCII compatible. Please try
again with the latest trunk code.
By the way, as a result, now
(prefer-coding-system 'utf-8-with-signature)
does not change default-file-coding-system. I'm not sure
what is the intention of preferring utf-8-with-signature,
one may want default-file-coding-system be set to utf-8 in
such a case. But, doing that automatically is too
heuristic. Another possibility is that what actually wanted
is such a coding as utf-8-with-signature-on-decoding-only
(i.e. on decoding, BOM is recognized, but on encoding, don't
produce BOM).
---
Kenichi Handa
handa@m17n.org