1 files changed, 15 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/oclosure.el b/lisp/emacs-lisp/oclosure.el
index 9775e8cc656..c77ac151d77 100644
--- a/lisp/emacs-lisp/oclosure.el
+++ b/lisp/emacs-lisp/oclosure.el
@@ -557,6 +557,21 @@ This has 2 uses:
 (oclosure-define (save-some-buffers-function
                   (:predicate save-some-buffers-function--p)))
 
+;; This OClosure type is used internally by `cconv.el' to handle
+;; the case where we need to build a closure whose `interactive' spec
+;; captures variables from the context.
+;; It arguably belongs with `cconv.el' but is needed at runtime,
+;; so we placed it here.
+(oclosure-define (cconv--interactive-helper) fun if)
+(defun cconv--interactive-helper (fun if)
+  "Add interactive \"form\" IF to FUN.
+Returns a new command that otherwise behaves like FUN.
+IF should actually not be a form but a function of no arguments."
+  (oclosure-lambda (cconv--interactive-helper (fun fun) (if if))
+      (&rest args)
+    (apply (if (called-interactively-p 'any)
+               #'funcall-interactively #'funcall)
+           fun args)))
 
 (provide 'oclosure)
 ;;; oclosure.el ends here