vim-patch:8.2.3619: cannot use a lambda for 'operatorfunc' (#19846)

Problem:    Cannot use a lambda for 'operatorfunc'.
Solution:   Support using a lambda or partial. (Yegappan Lakshmanan,
            closes vim/vim#8775)
https://github.com/vim/vim/commit/777175b0df8c5ec3cd30d19a2e887e661ac209c8

Omit duplicate docs. It's removed in patch 8.2.3623.
Nvim doesn't seem to need callback_set() as it was omitted when patch 8.1.1437
was first ported.

1 files changed, 21 insertions, 1 deletions

diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index c3edc5b315..b4fc7534bc 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -6136,6 +6136,23 @@ static void op_colon(oparg_T *oap)
   // do_cmdline() does the rest
 }
 
+/// callback function for 'operatorfunc'
+static Callback opfunc_cb;
+
+/// Process the 'operatorfunc' option value.
+/// @return  OK or FAIL
+int set_operatorfunc_option(void)
+{
+  return option_set_callback_func(p_opfunc, &opfunc_cb);
+}
+
+#if defined(EXITFREE)
+void free_operatorfunc_option(void)
+{
+  callback_free(&opfunc_cb);
+}
+#endif
+
 /// Handle the "g@" operator: call 'operatorfunc'.
 static void op_function(const oparg_T *oap)
   FUNC_ATTR_NONNULL_ALL
@@ -6173,7 +6190,10 @@ static void op_function(const oparg_T *oap)
     // Reset finish_op so that mode() returns the right value.
     finish_op = false;
 
-    (void)call_func_retnr((char *)p_opfunc, 1, argv);
+    typval_T rettv;
+    if (callback_call(&opfunc_cb, 1, argv, &rettv) != FAIL) {
+      tv_clear(&rettv);
+    }
 
     virtual_op = save_virtual_op;
     finish_op = save_finish_op;