feat: support items data in base pack

res/content/base/modules/util.lua

@@ -1,12 +1,13 @@
 local util = {}
 
-function util.drop(ppos, itemid, count, pickup_delay)
+function util.drop(ppos, itemid, count, data, pickup_delay)
     if itemid == 0 or not itemid then
         return nil
     end
     return entities.spawn("base:drop", ppos, {base__drop={
         id=itemid,
         count=count,
+        data=data,
         pickup_delay=pickup_delay
     }})
 end

res/content/base/scripts/components/drop.lua

@@ -14,6 +14,7 @@ end
 if SAVED_DATA.item then
     dropitem.id = item.index(SAVED_DATA.item)
     dropitem.count = SAVED_DATA.count
+    dropitem.data = SAVED_DATA.data
 end
 
 local DROP_SCALE = 0.3
@@ -25,6 +26,7 @@ local rotation = mat4.rotate({
 function on_save()
     SAVED_DATA.item = item.name(dropitem.id)
     SAVED_DATA.count = dropitem.count
+    SAVED_DATA.data = dropitem.data
 end
 
 do -- setup visuals
@@ -59,11 +61,10 @@ function on_sensor_enter(index, oid)
     if pid == -1 then
         -- other is base:drop too
         if index == 0 and other:def_index() == def_index then
-            local odrop = other:get_component("base:drop")
-            if odrop.dropitem.id == dropitem.id then
-                -- // TODO: replace combination logic with item.* function
+            local odrop = other:get_component("base:drop").dropitem
+            if odrop.id == dropitem.id and not odrop.data then
                 local stack = item.stack_size(dropitem.id)
-                local sum = dropitem.count + odrop.dropitem.count
+                local sum = dropitem.count + odrop.count
                 if sum <= stack then
                     dropitem.count = sum
                     other:despawn()
@@ -75,7 +76,7 @@ function on_sensor_enter(index, oid)
 
     if timer < 0.0 and index == 0 then
         entity:despawn()
-        inventory.add(player.get_inventory(pid), dropitem.id, dropitem.count)
+        inventory.add(player.get_inventory(pid), dropitem.id, dropitem.count, dropitem.data)
         audio.play_sound_2d("events/pickup", 0.5, 0.8 + math.random() * 0.4, "regular")
     end
     if index == 1 then

res/content/base/scripts/hud.lua

@@ -14,12 +14,13 @@ function on_hud_open()
         if itemid == 0 then
             return
         end
+        local data = inventory.get_all_data(invid, slot)
         inventory.set(invid, slot, itemid, itemcount-1)
 
         local pvel = {player.get_vel(pid)}
         local ppos = vec3.add({player.get_pos(pid)}, {0, 0.7, 0})
         local throw_force = vec3.mul(player.get_dir(pid), DROP_FORCE)
-        local drop = base_util.drop(ppos, itemid, 1, 1.5)
+        local drop = base_util.drop(ppos, itemid, 1, data, 1.5)
         local velocity = vec3.add(throw_force, vec3.add(pvel, DROP_INIT_VEL))
         drop.rigidbody:set_vel(velocity)
     end)

src/items/ItemStack.cpp

@@ -57,6 +57,9 @@ void ItemStack::setField(std::string_view name, dv::value value) {
     }
     if (value == nullptr) {
         fields.erase(std::string(name));
+        if (fields.empty()) {
+            fields = nullptr;
+        }
         return;
     }
     fields[std::string(name)] = std::move(value);

src/items/ItemStack.hpp

@@ -54,4 +54,8 @@ public:
     const dv::value& getFields() const {
         return fields;
     }
+
+    bool hasFields() const {
+        return fields != nullptr;
+    }
 };

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

@@ -208,7 +208,10 @@ static int l_get_all_data(lua::State* L, ItemStack& stack) {
 }
 
 static int l_has_data(lua::State* L, ItemStack& stack) {
-    auto key = lua::require_string(L, 3);
+    auto key = lua::tostring(L, 3);
+    if (key == nullptr) {
+        return lua::pushboolean(L, stack.hasFields());
+    }
     return lua::pushboolean(L, stack.getField(key) != nullptr);
 }