GNU bug report logs - #77224
[PATCH] New minor mode 'cursor-indicators-mode'

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From: Elijah Gabe Pérez <eg642616 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: mail <at> daniel-mendler.de, 77224 <at> debbugs.gnu.org, juri <at> linkov.net
Subject: bug#77224: [PATCH] New minor mode 'cursor-indicators-mode'
Date: Thu, 27 Mar 2025 11:10:06 -0600

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Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Elijah Gabe Pérez <eg642616 <at> gmail.com>
>> Date: Thu, 27 Mar 2025 08:53:25 -0600
>> Cc: mail <at> daniel-mendler.de, 77224 <at> debbugs.gnu.org, 
>> 	Juri Linkov <juri <at> linkov.net>

>> Eli Zaretskii <eliz <at> gnu.org> writes:

>>  Btw, a possibly even better way is to modify the cursor looks from the
>>  hooks of the relevant commands, like overwrite-mode.  If some of them
>>  don't have a hook, we could add a hook.  This is better because it
>>  doesn't unnecessarily "punish" Emacs anywhere else, only the commands
>>  that could affect the cursor.

>> But what if user prefer using a lambda instead a function? For example for a specific mode or action from a
>> key binding package such as evil or meow
> Sorry, I don't understand: what lambda?  Aren't all the modes you want
> to catch normal minor modes with a hook?

Not only minor mode, also functions (function symbols or anonymous ones).
for example if user wants to change cursor appearance if a text at
current cursor position have an overlay or whatever, can do it
defining a function in their config:

#+begin_src elisp
(defun my/cursor-change ()
  (string-prefix-p " *" (buffer-name)))

(setopt cursor-indicators-conditions `((my/cursor-change hollow "yellow")))
#+end_src

or

#+begin_src elisp
(setopt cursor-indicators-conditions `((,(lambda () (string-prefix-p " *" (buffer-name)))
                                        hollow "yellow")))
#+end_src

The current code only check if symbol is a variable or a function
symbol (since minor modes also defines a variable with same minor
mode name) or a lambda, and it must return =non-nil=.

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