feat: menu pages dispatching

res/modules/gui_util.lua

@@ -1,4 +1,6 @@
-local gui_util = {}
+local gui_util = {
+    local_dispatchers = {}
+}
 
 --- Parse `pagename?arg1=value1&arg2=value2` queries
 --- @param query page query string
@@ -25,6 +27,11 @@ end
 --- @return document_id
 function gui_util.load_page(query)
     local name, args = gui_util.parse_query(query)
+    for i = #gui_util.local_dispatchers, 1, -1 do
+        local newname, newargs = gui_util.local_dispatchers[i](name, args)
+        name = newname or name
+        args = newargs or args
+    end
     local filename = file.find(string.format("layouts/pages/%s.xml", name))
     if filename then
         name = file.prefix(filename)..":pages/"..name
@@ -33,4 +40,15 @@ function gui_util.load_page(query)
     end
 end
 
+function gui_util.add_page_dispatcher(dispatcher)
+    if type(dispatcher) ~= "function" then
+        error("function expected")
+    end
+    table.insert(gui_util.local_dispatchers, dispatcher)
+end
+
+function gui_util.reset_local()
+    gui_util.local_dispatchers = {}
+end
+
 return gui_util