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What is the correct way to bind keys only for X frames? E.g. some key combinations are part of terminal escape sequences, but otherwise should be bindable when not running in a terminal.

Currently, I use an after-make-frame-functions hook:

(defun my-setup-nontty-bindings (frame)
  "Set up TTY-incompatible keybinds for FRAME, if it's not a TTY."
    (unless overriding-terminal-local-map
      (setq overriding-terminal-local-map (make-sparse-keymap)))
    (define-key overriding-terminal-local-map (kbd "M-[") 'cs/forward-or-backward-sexp)
    (define-key overriding-terminal-local-map (kbd "M-]") 'er/expand-region)))
(add-hook 'after-make-frame-functions 'my-setup-nontty-bindings)

This almost works, however:

  • A frame is not exactly the same as a terminal, and overriding-terminal-local-map is a per-terminal, not per-frame variable;
  • A non-nil overriding-terminal-local-map breaks international input, which is apparently by design.
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    Is it not possible to predicate the bindings on (display-graphic-p), e.g. (when (display-graphic-p) (define-key ...) ...)?
    – Basil
    Feb 14, 2018 at 21:48
  • I don't think you want to mess with overriding-terminal-local-map. It doesn't really have anything to do with terminal vs. graphical frames. You should probably just use global-set-key and display-graphic-p like @Basil suggested.
    – jpkotta
    Feb 14, 2018 at 21:59
  • No, that won't work because they are part of an escape sequence. Defining them in the global key map breaks all keys in the terminal whose sequence includes the ESC-[ sequence (i.e. arrow keys, F-keys...) Feb 15, 2018 at 1:37

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