mm-coding-system-priorities (was: charset=macintosh)

[Reiner Steib <4.uce.03.r.s@nurfuerspam.de>]

On Fri, Mar 07 2003, Simon Josefsson wrote:

> The reason Emacs doesn't list UTF-8 higher than macintosh is,
> supposedly, that the UTF-8 support is not complete.  Once it is
> complete, the emacs maintainers will probably change the preference
> ordering.

Apparently it has already been changed in Emacs 21.3, see below.

> Fortunately it is easy to override the priorities within Gnus:
>  '(mm-coding-system-priorities (quote (iso-latin-1 iso-latin-9 utf-8)))
>
> Hm.  The UTF-8 discussion in Emacs 21.2 PROBLEMS is not present in
> Emacs 21.3 prerelease, so perhaps it has been fixed.  I'll ask on
> emacs-devel whether utf-8 should be preferred over mac-roman.

Sample text: “quotes”

With Emacs 21.3.1 and current Oort [1] I get (in mml-preview):

,----
| (setq mm-coding-system-priorities nil)
| ==> charset=utf-8
| 
| (setq mm-coding-system-priorities '(macintosh utf-8))
| ==> charset=utf-8
| 
| (setq mm-coding-system-priorities '(mac-roman utf-8))
| ==> charset=macintosh
`----

Adding windows-1252 [2] gives:

,----
| (setq mm-coding-system-priorities nil)
| ==> charset=utf-8
| 
| (setq mm-coding-system-priorities '(windows-1252 macintosh utf-8))
| ==> charset=windows-1252
| 
| (setq mm-coding-system-priorities '(utf-8 macintosh windows-1252))
| ==> charset=windows-1252
| 
| (setq mm-coding-system-priorities '(mule-utf-8 windows-1252))
| ==> charset=utf-8
`----

Apparently, we need to write `mule-utf-8' and `mac-roman' instead of
`utf-8' and `macintosh', respectively.

,----[ C-h v mm-coding-system-priorities RET ]
| mm-coding-system-priorities's value is nil
| 
| Documentation:
| Preferred coding systems for encoding outgoing mails.
`----

So `mm-coding-system-priorities' expects an Emacs coding system and
not a MIME charset.  But OTOH...

,----[ M-x describe-coding-system utf-8 RET ]
| u -- utf-8 (alias of mule-utf-8)
`----

Hm, does it even expect the original name of the coding-system and
*not* an alias?  If so, I think this should be made more clear in the
documentation.

Bye, Reiner.

[1] Oort Gnus v0.18
In GNU Emacs 21.3.1 (i586-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
configured using `configure  --prefix=/soft/local/upp/emacs'
Important settings:
  value of $LC_CTYPE: en_US.ISO_8859-1
  value of $LANG: C
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

[2] http://theotp1.physik.uni-ulm.de/~ste/comp/emacs/gnus/rs-windows-1252.el
(require 'rs-windows-1252)
(rs-use-windows-1252)

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