vim encoding

今天安装 ALFS 时不小心改动了主系统 glibc 的 locale(localedef)，导致一些程序出问题，比如 xfce4 我开的 fcitx，不行了。刚才使用 vim 发现竟然出现了乱码，于是手工指定 vim 的 encoding:
$ vi ~/.vimrc
set encoding=cp936
用 utf-8 却不行。

另资料：
支持多种编码的 vimrc

set tabstop=4
set number
" set encoding=cp936

" multi-encoding setting
if has("multi_byte")
"set bomb
    set fileencodings=ucs-bom,utf-8,cp936,big5,euc-jp,euc-kr,latin1
    " CJK environment detection and corresponding setting
    if v:lang =~ "^zh_CN"
    " Use cp936 to support GBK, euc-cn == gb2312
        set encoding=cp936
        set termencoding=cp936
        set fileencoding=cp936
    elseif v:lang =~ "^zh_TW"
    " cp950, big5 or euc-tw
    " Are they equal to each other?
        set encoding=big5
        set termencoding=big5
        set fileencoding=big5
    elseif v:lang =~ "^ko"
    " Copied from someone's dotfile, untested
        set encoding=euc-kr
        set termencoding=euc-kr
        set fileencoding=euc-kr
    elseif v:lang =~ "^ja_JP"
    " Copied from someone's dotfile, untested
        set encoding=euc-jp
        set termencoding=euc-jp
        set fileencoding=euc-jp
    endif
    " Detect UTF-8 locale, and replace CJK setting if needed
    if v:lang =~ "utf8$" || v:lang =~ "UTF-8$"
        set encoding=utf-8
        set termencoding=utf-8
        set fileencoding=utf-8
    endif
else
echoerr "Sorry, this version of (g)vim was not compiled with multi_byte"
endif

注意 vimrc 的注释！