feat: reloading hud scripts

res/layouts/console.xml.lua

@@ -173,6 +173,8 @@ function run_current_file()
         func = function() item.reload_script(unit) end
     elseif script_type == "world" then
         func = function() world.reload_script(unit) end
+    elseif script_type == "hud" then
+        func = function() hud.reload_script(unit) end
     end
     local output = core.capture_output(func)
     document.output:add(
@@ -392,6 +394,7 @@ local function build_scripts_classification()
     local packs = pack.get_installed()
     for _, packid in ipairs(packs) do
         scripts_classification[packid..":scripts/world.lua"] = {"world", packid}
+        scripts_classification[packid..":scripts/hud.lua"] = {"hud", packid}
     end
 end
 

res/preload.json

@@ -33,7 +33,8 @@
         "gui/module",
         "gui/play",
         "gui/info",
-        "gui/world"
+        "gui/world",
+        "gui/hud"
     ],
     "fonts": [
         {

src/logic/scripting/lua/libs/libhud.cpp

@@ -171,6 +171,23 @@ static int l_set_allow_pause(lua::State* L) {
     return 0;
 }
 
+static int l_reload_script(lua::State* L) {
+    auto packid = lua::require_string(L, 1);
+    if (content == nullptr) {
+        throw std::runtime_error("content is not initialized");
+    }
+    auto& writeableContent = *engine->getWriteableContent();
+    auto pack = writeableContent.getPackRuntime(packid);
+    const auto& info = pack->getInfo();
+    scripting::load_hud_script(
+        pack->getEnvironment(),
+        packid,
+        info.folder / "scripts/hud.lua",
+        pack->getId() + ":scripts/hud.lua"
+    );
+    return 0;
+}
+
 const luaL_Reg hudlib[] = {
     {"open_inventory", wrap_hud<l_open_inventory>},
     {"close_inventory", wrap_hud<l_close_inventory>},
@@ -189,5 +206,6 @@ const luaL_Reg hudlib[] = {
     {"_set_content_access", wrap_hud<l_set_content_access>},
     {"_set_debug_cheats", wrap_hud<l_set_debug_cheats>},
     {"set_allow_pause", wrap_hud<l_set_allow_pause>},
+    {"reload_script", wrap_hud<l_reload_script>},
     {NULL, NULL}
 };

src/logic/scripting/scripting.cpp

@@ -806,21 +806,21 @@ bool scripting::register_event(
     if (lua::pushenv(L, env) == 0) {
         lua::pushglobals(L);
     }
-    if (lua::getfield(L, name)) {
+    bool success = true;
-        lua::pop(L);
     lua::getglobal(L, "events");
     lua::getfield(L, "reset");
     lua::pushstring(L, id);
-        lua::getfield(L, name, -4);
+    if (!lua::getfield(L, name, -4)) {
+        success = false;
+        lua::pushnil(L);
+    }
     lua::call_nothrow(L, 2);
     lua::pop(L);
 
     // remove previous name
     lua::pushnil(L);
     lua::setfield(L, name);
-        return true;
+    return success;
-    }
-    return false;
 }
 
 int scripting::get_values_on_stack() {