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Is there a function that maps a keyboard input character to the character that would have been input if the shift key modifier was being pressed? For instance if I pass the input ?c it would return ?C, or if I pass the input ?2 it would return ?@.

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    Spontaneously, I don't think so since Emacs has no direct knowledge about keymaps. Hence, it can't know if shift 2 would be @ (as used in the US) or " (which is used on some european layouts). Commented Jun 1, 2022 at 18:37
  • Sticky Keys might be helpful for you. It's a feature of your operating system and/or keyboard, not Emacs.
    – Tyler
    Commented Jun 1, 2022 at 18:59
  • If the goal is, for example, to bind a command to “Ctrl+Shift+2” in a way that's independent of the keyboard layout, I don't think Emacs provides a way to do this. Emacs's key binding philosophy is to be independent of the keyboard layout, for example up/down/left/right are P[revious]/N[ext]/B[ackward]/F[orward] and not WASD or ijkl. I don't think there's any code in Emacs to query the “base key” information when parsing an event from the operating system. Commented Jun 1, 2022 at 19:04

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You can probably do it with the function event-apply-shift-modifier. But it will depend on exactly what you're using it for (of course).

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    event-apply-shift-modifier reads an event, it doesn't take an event or a character as argument. You'd need to call event-apply-modifier directly. But that wouldn't do what the asker wants: it uppercases ASCII letters, but you can easily do that manually anyway. Other characters (non-ASCII letters, non-letters) are mapped to events with the shift bit set, not to a different base character. Commented Jun 1, 2022 at 18:59

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