Making highlight-sexp follow modus-themes-toggle

Jan 26, 2023| elisp, emacs

[2023-01-27 Fri] Prot just added a modus-themes-get-color-value function. Yay! Also, it turns out that I need to update the overlay in all the buffers.

I'm experimenting with using the highlight-sexp minor mode to highlight my current s-expression, since I sometimes get confused about what I'm modifying with smartparens. The highlight-sexp background colour is hardcoded in the variable hl-sexp-background-color, and will probably look terrible if you use a light background. I wanted it to adapt when I use modus-themes-toggle. Here's how that works:

Listing 1: highlight-sexp demonstration

(use-package highlight-sexp
  :quelpa
  (highlight-sexp :repo "daimrod/highlight-sexp" :fetcher github :version original)
  :hook
  (emacs-lisp-mode . highlight-sexp-mode)
  :config
  (defun my-hl-sexp-update-overlay ()
    (when (overlayp hl-sexp-overlay)
      (overlay-put
       hl-sexp-overlay
       'face
       `(:background        
         ,(if (fboundp 'modus-themes-get-color-value)
              (modus-themes-get-color-value 'bg-inactive)
            (car
             (assoc-default
              'bg-inactive
              (modus-themes--current-theme-palette))))))))
  (defun my-hl-sexp-update-all-overlays ()
    (dolist (buf (buffer-list))
      (with-current-buffer buf
        (when highlight-sexp-mode
          (my-hl-sexp-update-overlay)))))
  (advice-add 'hl-sexp-create-overlay :after 'my-hl-sexp-update-overlay)
  (advice-add 'modus-themes-toggle :after 'my-hl-sexp-update-all-overlays))

This is what it looks like:

Figure 1: Animation of highlight-sexp toggling along with modus-themes-toggle

This is part of my Emacs configuration.

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