menu_get(): fix query behavior

- Return the menu properties, not only its children.
- If the {path} param is given, return only the first node. The "next"
  nodes in the linked-list are irrelevant.

runtime/doc/eval.txt

@@ -5666,23 +5666,24 @@ max({expr})	Return the maximum value of all items in {expr}.
 
 menu_get({path}, {modes})				*menu_get()*
 		Returns a |List| of |Dictionaries| describing |menus| (defined
-		by |:menu|, |:amenu|, etc.).
+		by |:menu|, |:amenu|, …), including |hidden-menus|.
-		{path} limits the result to a subtree of the menu hierarchy
+
-		(empty string matches all menus). E.g. to get items in the
+		{path} matches a menu by name, or all menus if {path} is an
-		"File" menu subtree: >
+		empty string.  Example: >
 			:echo menu_get('File','')
+			:echo menu_get('')
 <
 		{modes} is a string of zero or more modes (see |maparg()| or
 		|creating-menus| for the list of modes). "a" means "all".
 
-		For example: >
+		Example: >
 			nnoremenu &Test.Test inormal
 			inoremenu Test.Test insert
 			vnoremenu Test.Test x
 			echo menu_get("")
-<
+
-		returns something like this:
+<		returns something like this: >
->
+
 			[ {
 			  "hidden": 0,
 			  "name": "Test",

src/nvim/menu.c

@@ -735,22 +735,26 @@ static dict_T *menu_get_recursive(const vimmenu_T *menu, int modes)
 /// @return false if could not find path_name
 bool menu_get(char_u *const path_name, int modes, list_T *list)
 {
-  vimmenu_T   *menu;
+  vimmenu_T *menu = find_menu(root_menu, path_name, modes);
-  menu = find_menu(root_menu, path_name, modes);
   if (!menu) {
     return false;
   }
   for (; menu != NULL; menu = menu->next) {
-    dict_T *dict = menu_get_recursive(menu, modes);
+    dict_T *d = menu_get_recursive(menu, modes);
-    if (dict && tv_dict_len(dict) > 0) {
+    if (d && tv_dict_len(d) > 0) {
-      tv_list_append_dict(list, dict);
+      tv_list_append_dict(list, d);
+    }
+    if (*path_name != NUL) {
+      // If a (non-empty) path query was given, only the first node in the
+      // find_menu() result is relevant.  Else we want all nodes.
+      break;
     }
   }
   return true;
 }
 
 
-/// Find menu matching required name and modes
+/// Find menu matching `name` and `modes`.
 ///
 /// @param menu top menu to start looking from
 /// @param name path towards the menu

test/functional/ex_cmds/menu_spec.lua

@@ -83,7 +83,7 @@ describe('menu_get', function()
   it("path='', modes='a'", function()
     local m = funcs.menu_get("","a");
     -- HINT: To print the expected table and regenerate the tests:
-    -- print(require('pl.pretty').dump(m))
+    -- print(require('inspect')(m))
     local expected = {
       {
         shortcut = "T",
@@ -310,8 +310,11 @@ describe('menu_get', function()
 
   it('matching path, all modes', function()
     local m = funcs.menu_get("Export", "a")
-    local expected = {
+    local expected = { {
-      {
+      hidden = 0,
+      name = "Export",
+      priority = 500,
+      submenus = { {
         tooltip = "This is the tooltip",
         hidden = 0,
         name = "Script",
@@ -325,8 +328,8 @@ describe('menu_get', function()
             silent = 0
           }
         }
-      }
+      } }
-    }
+    } }
     eq(expected, m)
   end)