3 files changed, 74 insertions, 0 deletions
diff --git a/indra/newview/scripts/lua/require/UI.lua b/indra/newview/scripts/lua/require/UI.lua
index 1eee4657f4..06b49c6269 100644
--- a/indra/newview/scripts/lua/require/UI.lua
+++ b/indra/newview/scripts/lua/require/UI.lua
@@ -14,6 +14,10 @@ function UI.call(func, parameter)
     leap.request('UI', {op='call', ['function']=func, parameter=parameter})
 end
 
+function UI.callables()
+    return leap.request('UI', {op='callables'}).callables
+end
+
 function UI.getValue(path)
     return leap.request('UI', {op='getValue', path=path})['value']
 end
@@ -135,4 +139,34 @@ function UI.snapshot(...)
     args.op = 'saveSnapshot'
     return leap.request('LLViewerWindow', args).result
 end
+
+-- ***************************************************************************
+--  Top menu
+-- ***************************************************************************
+
+function UI.addMenu(...)
+    local args = mapargs('name,label', ...)
+    args.op = 'addMenu'
+    return leap.request('UI', args)
+end
+
+function UI.addMenuBranch(...)
+    local args = mapargs('name,label,parent_menu', ...)
+    args.op = 'addMenuBranch'
+    return leap.request('UI', args)
+end
+
+-- see UI.callables() for valid values of 'func'
+function UI.addMenuItem(...)
+    local args = mapargs('name,label,parent_menu,func,param', ...)
+    args.op = 'addMenuItem'
+    return leap.request('UI', args)
+end
+
+function UI.addMenuSeparator(...)
+    local args = mapargs('parent_menu', ...)
+    args.op = 'addMenuSeparator'
+    return leap.request('UI', args)
+end
+
 return UI
diff --git a/indra/newview/scripts/lua/test_callables.lua b/indra/newview/scripts/lua/test_callables.lua
new file mode 100644
index 0000000000..1bee062db8
--- /dev/null
+++ b/indra/newview/scripts/lua/test_callables.lua
@@ -0,0 +1,6 @@
+startup=require 'startup'
+UI=require 'UI'
+startup.wait('STATE_LOGIN_WAIT')
+for _, cbl in pairs(UI.callables()) do
+    print(`{cbl.name} ({cbl.access})`)
+end
diff --git a/indra/newview/scripts/lua/test_top_menu.lua b/indra/newview/scripts/lua/test_top_menu.lua
new file mode 100644
index 0000000000..780a384c92
--- /dev/null
+++ b/indra/newview/scripts/lua/test_top_menu.lua
@@ -0,0 +1,34 @@
+UI = require 'UI'
+
+--Add new drop-down 'LUA Menu' to the Top menu.
+local MENU_NAME = "lua_menu"
+UI.addMenu{name=MENU_NAME,label="LUA Menu"}
+
+--Add two new menu items to the 'LUA Menu': 'Debug console' and 'Scripts'
+UI.addMenuItem{name="lua_debug",label="Debug console",
+                param="lua_debug",
+                func="Floater.ToggleOrBringToFront",
+                parent_menu=MENU_NAME}
+
+UI.addMenuItem{name="lua_scripts",label="Scripts",
+                param="lua_scripts",
+                func="Floater.ToggleOrBringToFront",
+                parent_menu=MENU_NAME}
+
+--Add menu separator to the 'LUA Menu' under added menu items
+UI.addMenuSeparator{parent_menu=MENU_NAME}
+
+--Add two new menu branch 'About...' to the 'LUA Menu'
+local BRANCH_NAME = "about_branch"
+UI.addMenuBranch{name="about_branch",label="About...",parent_menu=MENU_NAME}
+
+--Add two new menu items to the 'About...' branch
+UI.addMenuItem{name="lua_info",label="Lua...",
+                param="https://www.lua.org/about.html",
+                func="Advanced.ShowURL",
+                parent_menu=BRANCH_NAME}
+
+UI.addMenuItem{name="lua_info",label="Luau...",
+                param="https://luau-lang.org/",
+                func="Advanced.ShowURL",
+                parent_menu=BRANCH_NAME}