doomemacs/modules/editor/snippets/autoload/evil.el

;;; editor/snippets/autoload/evil.el -*- lexical-binding: t; -*-
;;;###if (featurep! :editor evil)

;;;###autoload
(defun +snippets/expand-on-region ()
  "Only use this with `evil-mode'. Expands a snippet around a selected region
and switches to insert mode if there are editable fields."
  (interactive)
  (when (evil-visual-state-p)
    (evil-visual-select evil-visual-beginning evil-visual-end 'inclusive))
  (cl-letf (((symbol-function 'region-beginning) (lambda () evil-visual-beginning))
            ((symbol-function 'region-end)       (lambda () evil-visual-end)))
    (yas-insert-snippet))
  (when (yas-active-snippets)
    (evil-insert-state +1)))