fix(api): notify dict watchers on nvim_set_var and vim.g setter

Co-authored-by: bfredl <bjorn.linse@gmail.com>
Co-authored-by: Christian Clason <c.clason@uni-graz.at>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/nvim/lua/stdlib.c b/src/nvim/lua/stdlib.c
index 9b1890403e..498f956ed9 100644
--- a/src/nvim/lua/stdlib.c
+++ b/src/nvim/lua/stdlib.c
@@ -369,12 +369,19 @@ int nlua_setvar(lua_State *lstate)
     return 0;
   }
 
+  bool watched = tv_dict_is_watched(dict);
+
   if (del) {
     // Delete the key
     if (di == NULL) {
       // Doesn't exist, nothing to do
       return 0;
     } else {
+      // Notify watchers
+      if (watched) {
+        tv_dict_watcher_notify(dict, key.data, NULL, &di->di_tv);
+      }
+
       // Delete the entry
       tv_dict_item_remove(dict, di);
     }
@@ -388,17 +395,29 @@ int nlua_setvar(lua_State *lstate)
       return luaL_error(lstate, "Couldn't convert lua value");
     }
 
+    typval_T oldtv = TV_INITIAL_VALUE;
+
     if (di == NULL) {
       // Need to create an entry
       di = tv_dict_item_alloc_len(key.data, key.size);
       tv_dict_add(dict, di);
     } else {
+      if (watched) {
+        tv_copy(&di->di_tv, &oldtv);
+      }
       // Clear the old value
       tv_clear(&di->di_tv);
     }
 
     // Update the value
     tv_copy(&tv, &di->di_tv);
+
+    // Notify watchers
+    if (watched) {
+      tv_dict_watcher_notify(dict, key.data, &tv, &oldtv);
+      tv_clear(&oldtv);
+    }
+
     // Clear the temporary variable
     tv_clear(&tv);
   }