; for cp1258
(prefer-coding-system 'windows-1258)
; for displaying utf-8 encoded file
(prefer-coding-system 'utf-8-emacs)
; for displaying chinese characters
(prefer-coding-system 'gb2312)
It would be a little problem. Because if I changed the gb2312 to gb18030
or gbk, the first setting (prefer-coding-system 'windows-1258) would
be failed.
I'm not sure what you mean by "would be failed", but when you use
prefer-coding-system, you have to realize that it's not quite as simple
as
it sounds:
- first, the three statements above mean to try (in this order) first
gb2312, then utf-8, then windows-1258.
- second, this order should not be chosen exclusively based on how often
you expect to use each of those encodings. Because it depends a lot of
the frequency of false positives. E.g. utf-8 should usually be first,
because it has very few false positives (if the auto-detect decides
it's
utf-8, then it's very unlikely that the file isn't utf-8).
OTOH window-1258 should *not* be first because it has many false
positives: any file without a 0 byte in it is a valid windows-1258
file.
The second point is the main reason why the order of detection of coding
systems when reading a file should be the same as the order of
preference to
choose a coding system to use when writing a file.