Add an usage tip stolen from the Consult Wiki

README.org

@@ -1561,6 +1561,9 @@ Consult usage tips are:
    consult-mark)}}} or {{{kbd(M-g m)}}}.  See [[https://arialdomartini.github.io//emacs-mark-ring][Emacs: Mark Ring]].
 2. {{{kbd(M-x consult-org-heading)}}} or {{{kbd(C-c C-h)}}} is an alternative to
    {{{kbd(M-x org-goto)}}} or {{{kbd(C-c C-j)}}}.
+3. Listing [[lst:find-file-preview]] uses the internal functions
+ ~consult--file-preview~ and ~consult--read~ to visit files with previewing
+   during selection. See: [[https://github.com/minad/consult/wiki][Consult Wiki]].
 
 #+attr_latex: :booktabs yes :float table
 #+caption[Configuration specific key bindings]:
@@ -1646,6 +1649,29 @@ Consult usage tips are:
   (keymap-global-set "M-y" #'consult-yank-pop))
 #+end_src
 
+#+caption[Implement =find-file= with previewing before selection]:
+#+caption: Implement =find-file= with previewing before selection.
+#+name: lst:find-file-preview
+#+begin_src emacs-lisp -n :results silent
+(defun consult-find-file-preview(cue &optional dir default mustmatch init pred)
+  (interactive)
+  (let ((default-directory (or dir default-directory))
+        (minibuffer-completing-file-name t))
+    (consult--read #'read-file-name-internal :state (consult--file-preview)
+                   :prompt cue :initial init
+                   :require-match mustmatch :predicate pred)))
+
+(defun toggle-find-file-preview ()
+  "Toggle previewing when calling `find-file'."
+  (interactive)
+  (let ((done "Enabled"))
+    (if (eq read-file-name-function #'read-file-name-default)
+        (setq read-file-name-function #'consult-find-file-preview)
+      (setq read-file-name-function #'read-file-name-default
+            done "Disabled"))
+    (message "%s `find-file' previewing" done)))
+#+end_src
+
 ** [[https://company-mode.github.io/][Company (info)]]
 :PROPERTIES:
 :CUSTOM_ID: sec:company-setup