vim-patch:8.1.2047: cannot check the current state

Problem:    Cannot check the current state.
Solution:   Add the state() function.

https://github.com/vim/vim/commit/0e57dd859ecb1e8a3b91509d2f4343e839340eb8

Co-authored-by: Bram Moolenaar <Bram@vim.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 08c5ef743b..052d67b05f 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -5994,6 +5994,13 @@ bool callback_from_typval(Callback *const callback, const typval_T *const arg)
   return true;
 }
 
+static int callback_depth = 0;
+
+int get_callback_depth(void)
+{
+  return callback_depth;
+}
+
 /// @return  whether the callback could be called.
 bool callback_call(Callback *const callback, const int argcount_in, typval_T *const argvars_in,
                    typval_T *const rettv)
@@ -6041,7 +6048,11 @@ bool callback_call(Callback *const callback, const int argcount_in, typval_T *co
   funcexe.fe_lastline = curwin->w_cursor.lnum;
   funcexe.fe_evaluate = true;
   funcexe.fe_partial = partial;
-  return call_func(name, -1, rettv, argcount_in, argvars_in, &funcexe);
+
+  callback_depth++;
+  int ret = call_func(name, -1, rettv, argcount_in, argvars_in, &funcexe);
+  callback_depth--;
+  return ret;
 }
 
 bool set_ref_in_callback(Callback *callback, int copyID, ht_stack_T **ht_stack,