Re: mm-coding-system-priorities per hierarchy

[Reiner Steib <reinersteib+gmane@imap.cc>]

On Fri, Sep 22 2006, Katsumi Yamaoka wrote:

>>>>>>	Reiner Steib wrote:
>> When using this expression...
>
>>   (add-to-list 'gnus-newsgroup-variables 'mm-coding-system-priorities)
>
>> ... `gnus-summary-make-local-variables' sets the global value of
>> `mm-coding-system-priorities' to nil.  I'd guess nil leads to utf-8
>> instead of iso-2022-jp in your environment.
>
> No, it is not caused by the nil value.

IIRC, if `mm-coding-system-priorities' is nil, Gnus uses Emacs'
`sort-coding-systems' to find the suitable charset.  So my guess was
that utf-8 is preferred to iso-2022-jp...

,----
| $ LC_ALL=C emacs -nw -Q -f ielm
|
| ELISP> current-language-environment
| "ASCII"
| ELISP> (sort-coding-systems '(iso-8859-1 iso-2022-jp iso-2022-jp-2 shift_jis utf-8))
| (iso-8859-1 iso-2022-jp shift_jis utf-8 iso-2022-jp-2)
| 
| ELISP> (set-language-environment "Japanese")
| t
| ELISP> (sort-coding-systems '(iso-8859-1 iso-2022-jp iso-2022-jp-2 shift_jis utf-8))
| (iso-2022-jp shift_jis iso-8859-1 utf-8 iso-2022-jp-2)
`----

But maybe...

,----
| $ LC_ALL=jp_JP.utf8 emacs -nw -Q -f ielm
| 
| ELISP> (sort-coding-systems '(iso-8859-1 iso-2022-jp iso-2022-jp-2 shift_jis utf-8))
| (utf-8 iso-2022-jp shift_jis iso-8859-1 iso-2022-jp-2)
`----

>> Do you get the expected behavior with this expression?
>
>>   (add-to-list 'gnus-newsgroup-variables
>> 	       '(mm-coding-system-priorities . global))
>
> That is not good for me.  It should be the following:
>
>   (add-to-list
>    'gnus-newsgroup-variables
>    '(mm-coding-system-priorities
>      . '(iso-8859-1 iso-2022-jp iso-2022-jp-2 shift_jis utf-8)))
>
> The value here is the default value of `mm-coding-system-priorities'
> in the Japanese language environment.  

My understanding is that `global' is supposed to take this value.  Is
it a bug (in gnus-sum.el) or am I missing something?

> Though it is insufficient for me even if I do so.
>
> If I set `gnus-parameters' (as you suggested) in addition to
> this, the value of `mm-coding-system-priorities' is changed into
> (iso-8859-1 iso-8859-15 utf-8) when I enter to a DE newsgroup.
> It is useful for posting German messages there (it is highly
> unlikely with me, though ;-).  However, I should not send
> Japanese mails in there even if I recall an urgent business.  It
> is because `iso-2022-jp', which is used for Japanese messages
> traditionally, is not preferred when encoding Japanese text.
>
> It is possible to send Japanese messages safely after I exit the
> DE group, isn't it?  *No*.  `mm-coding-system-priorities' still
> has the value (iso-8859-1 iso-8859-15 utf-8) at that time.  The
> value will not contain `iso-2022-jp' until I enter to a FJ group
> or a group that is not listed in `gnus-parameters'.
>
> What I'd like to say is that a similar problem will probably
> happen with people who are not in the Japanes language
> environment as well.  Group parameter is useful to things
> associated to group, however messages are not always associated
> to group.

I think it is (also?) a bug if entering a group modifies the
default-value of a variable.  It probably should only modify the local
values in the summary, article and message buffers for the matching
groups.

The code of `gnus-summary-make-local-variables' seems to be correct.
Maybe `gnus-set-global-variables' or some other function is the
culprit?

Bye, Reiner.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/