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In emacs-26.1, I am enabling the Japanese input method as follows ...

(toggle-enable-multibyte-characters 1)
(set-language-environment "Japanese")
(set-input-method "japanese")
(setq coding-system-for-read 'utf-8-unix)
(setq coding-system-for-write 'utf-8-unix)

This works fine and gives me hiragana characters when I enter their romaji equivalents, but SPC is mapped to a selection dialog for kanji characters. I want SPC to be mapped simply as self-insert-command, and I'd like to remap the kanji selection dialog to a different key sequence.

I tried the following, but it had no effect ...

(define-key kkc-keymap " " 'self-insert-command)
(define-key kkc-keymap "\C-^" 'kkc-next)

SPC still got me into the kanji selection dialog, and C-^did nothing.

I'm not sure, but it seems like there is code somewhere in kkc.el which forces kkc-next to be mapped to SPC, no matter what.

Short of completely rewriting some of the code in emacs-26.1/lisp/international/kkc.el, is there any way to remap the kanji selection dialog to something other than SPC?

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  • I'm not knowledgeable about this, but (1) are you sure you have the right keymap, and (2) have you tried (kbd "SPC") instead of " "?
    – Drew
    Sep 8, 2019 at 1:02
  • Thank you very much. It turns out that (kbd "SPC") does not change the behavior. Concerning the question of the correct keymap: in looking at the code in kkc.el, it seems that kkc-keymap is the one to use, but I am not sure. I'm hoping someone who is more familiar with the Japanese input method can help.
    – HippoMan
    Sep 8, 2019 at 14:11
  • PS: it seems like this automatic romaji-to-hiragana encoding is not done via the normal keymap and mode methodologies of emacs. My Japanese-enabled buffer remains in fundamental-mode. Also, in kkc.el, it seems like there is special logic to explicitly traverse the kkc-keymap in a non-standard manner when characters are being typed, even though the mode is still fundamental-mode. Anyway, I'm still digging into this and will report whatever I ultimately come up with.
    – HippoMan
    Sep 8, 2019 at 14:28

1 Answer 1

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I figured it out.

As defined in lisp/international/quail.el, (quail-conversion-keymap) returns the keymap which is used for input methods, including the Japanese input method. In this keymap, " " (and not (kbd "SPC") in this case) gets mapped to quail-japanese-kanji-kkc, which causes the input selection dialog to be invoked via kkc-region from within lisp/international/kkc.el.

So, doing the following to enter the Japanese input method accomplishes what I want ...

(toggle-enable-multibyte-characters 1)
(set-language-environment "Japanese")
(set-input-method "japanese")
(setq coding-system-for-read 'utf-8-unix)
(setq coding-system-for-write 'utf-8-unix)
;; Enter the kanji selection dialog via `\C-^`,
;; and change the spacebar to simply insert a space.
(let ((qckeymap (quail-conversion-keymap)))
  (define-key qckeymap "\C-^" 'quail-japanese-kanji-kkc)
  (define-key qckeymap " " 'self-insert-command))
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