Entity::Attachment now provides joint information

Pass the already-parsed joint value from AttachmentData to the
Entity::Attachment functor parameter, and confirm this in the unit test of the
builder_guard AI.

include/ientity.h

@@ -245,6 +245,9 @@ class Entity
 
         /// Vector offset where the attached entity should appear
         Vector3 offset;
+
+        /// Optional model joint to use as origin
+        std::string joint;
     };
 
     /// A functor which can receive Attachment objects

radiantcore/entity/AttachmentData.h

@@ -107,9 +107,16 @@ class AttachmentData
     {
         for (auto i = _objects.begin(); i != _objects.end(); ++i)
         {
+            // Locate attachment position
+            const AttachPos& pos = _positions.at(i->second.posName);
+
+            // Construct the functor argument
             Entity::Attachment a;
             a.eclass = i->second.className;
-            a.offset = _positions.at(i->second.posName).origin;
+            a.offset = pos.origin;
+            a.joint = pos.joint;
+
+            // Invoke the functor
             func(a);
         }
     }

test/Entity.cpp

@@ -680,6 +680,9 @@ TEST_F(EntityTest, CreateAIEntity)
     // Guard should have a hammer attachment
     auto attachments = getAttachments(guard);
     EXPECT_EQ(attachments.size(), 1);
+    EXPECT_EQ(attachments.front().eclass, "atdm:moveable_warhammer");
+    EXPECT_EQ(attachments.front().offset, Vector3(14, -6, -6));
+    EXPECT_EQ(attachments.front().joint, "Spine2");
 }
 
 }