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Use of where-is-internal

From: Paul W . Rankin
Subject: Use of where-is-internal
Date: Sat, 1 Feb 2020 16:53:58 +1000

I'm considering of using where-is-internal in a program outside of the
help library. I've used the following in my init for a while to cycle
windows and so far the world has persisted unscathed:

   (defun other-window-and-beyond (count &optional all-frames)
     "Select another window in cyclic ordering of windows.
   Successive pressing `o' calls `other-window'."
     (interactive "p")
     (let ((key-vector (where-is-internal this-command
                                          overriding-local-map t)))
        (let ((map (make-sparse-keymap)))
          (define-key map (vector (aref key-vector (1- (length key-vector))))
       (other-window count all-frames)))

This function allows me to type C-x o o o o to cycle through all windows
with the idea being to allow the command to work with any key binding
rather than hardcoding anything.

I maintain a minor mode called olivetti that also uses a transient key
map to allow changing a buffer-local variable with C-c { { { ... The key
binding is currently hardcoded within the transient key map but I'd like
to allow user customisation.

So, should I throw caution to the wind and reimplement the transient key
map in olivetti using where-is-internal despite it being clearly marked
as internal, or is there a better way?


Paul W. Rankin

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