Ken Shibata <firstname.lastname@example.org> writes:
To input single-width katakana, Mule provides two emacs lisp files, i.e. jisx0201.el and its/han-kata.el. jisx0201.el defines fence-hankaku-katakana (bound to M-x in fence-mode), which converts all double-width katakana and hiragana in fence-mode at once. its/han-kata.el defines its:select-hankaku-katakana (bound to M-C-x in fence-mode; C-x C-k x otherwise), which converts roma-ji into single-width katakana.
Furthermore, jisx0201.el defines hankaku-katakana-region and zenkaku-katakana-region (or -paragraph/-sentence/-word). These functions convert strings all at once. its/han-kata.el loads jisx0201.el, so you can load either of them in your .emacs. But note that loading these files takes fairly long time. If you often input single-width katakana, it is recommended to pre-load them in site-init.el.
1) In fence-mode, o type M-x to convert kana to single-width. o type M-h to revert single-width katakana to double-width hiragana. o type M-k to revert single-width katakana to double-width katakana.
2) Out of fence-mode, o type C-x C-k x to make typed roma-ji be converted to single-width katakana. o type C-x C-k h to make typed roma-ji be converted to double-width hiragana.
3) In fence-mode, o type M-C-x to make typed roma-ji be converted to single-width katakana. o type M-C-h to make typed roma-ji be converted to double-width hiragana.
(If you have exchanged BS and DEL by bobcat.el or something like that, and are using ESC key to input Meta, then M-C-h means ESC DEL.)