[oni-org] Automatically hide source code blocks marked as hidden

Source:
https://emacs.stackexchange.com/questions/44914/choose-individual-startup-visibility-of-org-modes-source-blocks

oni-org/oni-org.el

@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 2023.0530.174013
+;; Version: 2023.0601.224638
 ;; Package-Requires: (oni-yasnippet oni-alert oni-hydra org org-bullets org-edna diminish all-the-icons olivetti form-feed org-pretty-table)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -1210,5 +1210,22 @@ otherwise return ‘oni-org-link-nonexistent-file’."
 
 (org-link-set-parameters "file" :face #'oni-org-file-face-selector)
 
+;;; Automatically hide code blocks that specify they should be hidden.
+;; Inspired by
+;; https://emacs.stackexchange.com/questions/44914/choose-individual-startup-visibility-of-org-modes-source-blocks
+
+(defun oni-org-hide-hidden-code-blocks ()
+  "Hide any code blocks that have been marked as hidden.
+This is done by adding a ‘:hidden t’ header argument to the code block."
+  (interactive)
+  (org-block-map
+   (lambda ()
+     (let ((element (org-element-at-point)))
+       (when (and (equal (org-element-type element) 'src-block)
+                  (map-elt (nth 2 (org-babel-get-src-block-info)) :hidden))
+         (org-fold-hide-block-toggle t nil element))))))
+
+(add-hook 'org-mode-hook #'oni-org-hide-hidden-code-blocks)
+
 (provide 'oni-org)
 ;;; oni-org.el ends here