doomemacs/modules/ui/pretty-code/config.el

;;; ui/pretty-code/config.el -*- lexical-binding: t; -*-

(cond ((featurep! +fira)
       (load! "+fira"))
      ((featurep! +iosevka)
       (load! "+iosevka")))

(defvar +pretty-code-enabled-modes t
  "List of major modes in which `prettify-symbols-mode' should be enabled.
If t, enable it everywhere. If the first element is 'not, enable it in any mode
besides what is listed.")

;; When you get to the right edge, it goes back to how it normally prints
(setq prettify-symbols-unprettify-at-point 'right-edge)

(defun +pretty-code|init-pretty-symbols ()
  "Enabled `prettify-symbols-mode'.

If the current major mode is disabled in `+pretty-code-enabled-modes', this
function does nothing. Otherwise, it sets the value of
`prettify-code-symbols-alist' according to `+pretty-code-symbols-alist' for the
current major mode."
  (unless (eq major-mode 'fundamental-mode)
    (when (or (eq +pretty-code-enabled-modes 't)
              (if (eq (car +pretty-code-enabled-modes 'not))
                  (not (memq major-mode (cdr +pretty-code-enabled-modes)))
                (memq major-mode +pretty-code-enabled-modes)))
      (setq prettify-symbols-alist
            (append (alist-get major-mode +pretty-code-symbols-alist)
                    (default-value 'prettify-symbols-alist)))
      (when prettify-symbols-mode
        (prettify-symbols-mode -1))
      (prettify-symbols-mode +1))))

(add-hook 'after-change-major-mode-hook #'+pretty-code|init-pretty-symbols)