"""List all objects in a Quaternius .blend file."""
import sys
import bpy

if __name__ == "__main__":
    argv = sys.argv
    args = argv[argv.index("--") + 1:]
    bpy.ops.wm.open_mainfile(filepath=args[0])

    print("\nAll scene objects:")
    for o in sorted(bpy.context.scene.objects, key=lambda x: x.name):
        parent_info = f" (parent: {o.parent.name}" + (f", bone: {o.parent_bone}" if o.parent_bone else "") + ")" if o.parent else ""
        verts = f", {len(o.data.vertices)} verts" if o.type == 'MESH' else ""
        loc = tuple(round(v, 3) for v in o.matrix_world.translation)
        print(f"  {o.name:30s} type={o.type:10s} loc={loc}{verts}{parent_info}")

    arm = next((o for o in bpy.context.scene.objects if o.type == 'ARMATURE'), None)
    if arm:
        head_bone = arm.data.bones.get('Head')
        if head_bone:
            print(f"\nHead bone top: z={round(head_bone.tail_local[2], 4)}")