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I would like to toggle input method in emacs with OS key binding, i.e. ctrl-shift, so it behaves like a normal desktop application. In other words I want to rebind C-\ to just C-S without any extra keys.

My keypoints are:

  1. I am on Linux
  2. I want all key bindings to work regardless of current language, including evil-ones.
  3. Switching languages should be done on key release (C-S-% should not switch language)

I tried to write XKB-interceptor on C, which is listens XkbActionMessages and sends it back to emacs. It works, but due to XKB Bug 865 it switches languages on key press, not release. So it messes with C-S-x key bindings. There is a patch to workaround this bug, but it not covers XkbActionMessages message. Extending that patch is too much for me.

Maybe there is easier way to accomplish my goal?

  • The question is not too clear, for me. Do you mean only Control + Shift or those in combination with some other key(s)? Those are only modifier keys. – Drew Mar 18 '16 at 14:33
  • Please clarify what you are trying to do. Note that, if you bind C-S at the OS level such that the OS intercepts the keys before they ever reach Emacs, there's nothing Emacs can do about it. – Dan Mar 18 '16 at 14:55
  • I want to make C-S to switch input methods without any other keys. I know I can't do it within emacs itself, it's more like a linux question. – Igor Avdeev Mar 18 '16 at 15:26
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    I'm pretty sure this can't be done within Emacs. You'd either have to modify the Emacs source code (the C part, not just the Lisp part) or use a third-party program that intercepts the keyboard action and sends something else to Emacs. We can't help you with that third-party program since it has nothing to do with Emacs. – Gilles Mar 18 '16 at 17:22
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    Regarding that third-party program, if you're coding something, you can ask for help on Stack Overflow. If you're looking for something ready-made, you can ask on Unix & Linux; be sure to mention what window manager or desktop environment you're using as many WM/DE perform their own keyboard interception. Also, what GUI toolkit is Emacs using (if you don't understand the question, what binary are you using, e.g. “the `emacs24-lucid” package from Debian”)? – Gilles Mar 18 '16 at 17:22
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I ended up with this solution on python, which parses xinput and sends a key to emacs window.

  • If this solution meets your needs, please accept your own answer so we can mark the question as closed. – Dan Mar 26 '17 at 9:27

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