Custom script for import doesn't work

[satyries]

Operating system or device, Godot version, GPU Model and driver (if graphics related):

Godot on *buntu 17.04

Issue description:
Whatever script.gd (even an empty one) you put in the "Custom Script" gives generic error ( Error running post-import script ) without telling anything about what's wrong. The official Wiki says you're supposed to use this code to make it work

tool # needed so it runs in editor
extends EditorScenePostImport

func post_import(scene):

return scene # remember to return the imported scene

This code works with Godot2, but both class EditorScenePostImport and function post_import are not present in Godot3

Steps to reproduce:

• While in Godot Editor select the item you want to import.
• Select Import on the left box then put a script in Custom Script
• Click Re-import
  = generic error appear, item cannot be imported anymore until you don't remove that script file

Link to minimal example project:

minidemo.zip
demo: while in editor try to reimport the box.dae

[volzhs]

post_import is actually here.

godot/editor/import/resource_importer_scene.cpp

Lines 55 to 61 in 0899b50

	Node *EditorScenePostImport::post_import(Node *p_scene) {
	if (get_script_instance())
	return get_script_instance()->call("post_import", p_scene);
	return p_scene;
	}

but not binded

godot/editor/editor_node.cpp

Lines 3268 to 3270 in 9f78878

	// FIXME: Is this stuff obsolete, or should it be ported to new APIs?
	//ClassDB::register_class<EditorScenePostImport>();
	//ClassDB::register_type<EditorImportExport>();

@reduz @akien-mga is it really obsolete?

[volzhs]

I just uncommented //ClassDB::register_class<EditorScenePostImport>();
This code works really well.

tool # needed so it runs in editor
extends EditorScenePostImport

func post_import(scene):
    # do your stuff here
    for child in scene.get_children():
        if child is MeshInstance:
            child.set_surface_material(0, preload("res://materials/my.material"))
    return scene # remember to return the imported scene

[satyries]

I can confirm what @volzhs said, by uncommenting that line and compiling I was able to use the post_import again.

I guess this feature is not supported atm if there's looking for new API so I won't report if any bug/issue is found while using... but still it's something nice to have: saves lot of manual work, in which, even onto unstable testing can come handy.