Re: How to bind isearch-repeat-forward to F3 in a certain mode only?

[Michael Heerdegen]

Marcin Borkowski <mbork@mbork.pl> writes:

> ,----
> | (my-mode)
> | (make-local-variable 'isearch-mode-map)
> | (define-key isearch-mode-map (kbd "<F3>") #'isearch-repeat-forward)
> `----
>
> but to no avail.  Inspecting `isearch-mode-map' implies that it was in
> fact changed globally.  Pressing F3 while in isearch, though, starts
> recording a keyboard macro anyway (both in my-mode and outside it).

Your approach seems reasonable.  There are two errors in your code
however:

1. (kbd "<F3>") obviously doesn't return the key sequence you want.  I
don't use `kbd'; I would just use [f3] instead.

2. Your change is "globally visible" because you missed that in Lisp,
variables reference lists by reference, not by value.  Keymaps are lists
in Elisp.

So, in your code, you create a new (local) binding, but that binding
still refers to the same object.  Use `copy-keymap' to fix that.  So at
the end you would have something like

(setq-local isearch-mode-map (copy-keymap isearch-mode-map))
(define-key isearch-mode-map [f3] #'isearch-repeat-forward)

You can do that in your `my-mode-hook' of course.


Regards,

Michael.