Make an "Org introspection" section that disables tangling

README.org

@@ -2413,9 +2413,9 @@ else:
 |  -2 | [NO-PACKAGES]         |
 |  -3 | [NO-EXTRA]            |
 
-*** Debug setting =org-babel-load-languages= options
+*** Org introspection
 :PROPERTIES:
-:CUSTOM_ID: sec:setopt-org-babel-load-languages
+:CUSTOM_ID: sec:org-introspection
 :header-args:emacs-lisp: :exports code :tangle no
 :END:
 
@@ -2499,6 +2499,55 @@ Return a list of items where the filename is the `car' of each item and the
  ("ob-sqlite" "sqlite"))
 #+end_src
 
+#+caption[Find active Org Babel languages]:
+#+caption: Find active Org Babel languages.
+#+name: lst:org-babel-active-languages
+#+header: :wrap "src emacs-lisp :results silent :tangle no"
+#+begin_src emacs-lisp :exports both :results value pp
+(defun org-babel-active-languages ()
+  (let ((result '("conf" "latex-extra-header" "latex-header" "text" "toml")))
+    (mapatoms
+     (lambda (x)
+       (when (and
+              (string-prefix-p "org-babel-execute:" (symbol-name x))
+              (not (eq 'org-babel-shell-initialize (get x 'definition-name))))
+         (when (symbol-file x)
+           (push (string-remove-prefix "org-babel-execute:" (symbol-name x))
+                 result)))))
+    result))
+
+(mapcar #'list (org-babel-active-languages))
+#+end_src
+
+#+caption[Active Org Babel languages]:
+#+caption: Active Org Babel languages.
+#+RESULTS: lst:org-babel-active-languages
+#+begin_src emacs-lisp :results silent :tangle no
+(("calc")
+ ("perl")
+ ("lisp")
+ ("eshell")
+ ("maxima")
+ ("fortran")
+ ("D")
+ ("C")
+ ("C++")
+ ("latex-header")
+ ("org")
+ ("cpp")
+ ("js")
+ ("shell")
+ ("elisp")
+ ("latex-extra-header")
+ ("latex")
+ ("emacs-lisp")
+ ("conf")
+ ("latex-extra-header")
+ ("latex-header")
+ ("text")
+ ("toml"))
+#+end_src
+
 *** [[https://github.com/bdarcus/citar][Citar: citing bibliography]] with [[https://orgmode.org/][Org Mode]]
 :PROPERTIES:
 :CUSTOM_ID: sec:citing-bibliography