lua: Add ability to pass tables with __call

vim-patch:8.2.1054: not so easy to pass a lua function to Vim
vim-patch:8.2.1084: Lua: registering function has useless code

I think I have also opened up the possibility for people to use these
callbacks elsewhere, since I've added a new struct that we should be
able to use.

Also, this should allow us to determine what the state of a list is in
Lua or a dictionary in Lua, since we now can track the luaref as we go.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/nvim/eval/userfunc.c b/src/nvim/eval/userfunc.c
index ca2f4a32ca..229f0e8dde 100644
--- a/src/nvim/eval/userfunc.c
+++ b/src/nvim/eval/userfunc.c
@@ -3458,7 +3458,6 @@ char_u *register_cfunc(cfunc_T cb, cfunc_free_T cb_free, void *state)
 {
   char_u *name = get_lambda_name();
   ufunc_T *fp = NULL;
-  int flags = FC_CFUNC;
 
   fp = xcalloc(1, offsetof(ufunc_T, uf_name) + STRLEN(name) + 1);
   if (fp == NULL) {
@@ -3467,7 +3466,7 @@ char_u *register_cfunc(cfunc_T cb, cfunc_free_T cb_free, void *state)
 
   fp->uf_refcount = 1;
   fp->uf_varargs = true;
-  fp->uf_flags = flags;
+  fp->uf_flags = FC_CFUNC;
   fp->uf_calls = 0;
   fp->uf_script_ctx = current_sctx;
   fp->uf_cb = cb;
@@ -3477,5 +3476,5 @@ char_u *register_cfunc(cfunc_T cb, cfunc_free_T cb_free, void *state)
   STRCPY(fp->uf_name, name);
   hash_add(&func_hashtab, UF2HIKEY(fp));
 
-  return name;
+  return fp->uf_name;
 }