SWBF-msh-Blender-IO/addons/io_scene_swbf_msh/__init__.py

bl_info = {
    'name': 'SWBF .msh export',
    'author': '',
    "version": (0, 1, 0),
    'blender': (2, 80, 0),
    'location': 'File > Import-Export',
    'description': 'Export as SWBF .msh file',
    'warning': '',
    'wiki_url': "",
    'tracker_url': "",
    'support': 'COMMUNITY',
    'category': 'Import-Export'
}

# Taken from glTF-Blender-IO, because I do not understand Python that well
# (this is the first thing of substance I've created in it) and just wanted 
# script reloading to work.
# 
# https://github.com/KhronosGroup/glTF-Blender-IO
#
# Copyright 2018-2019 The glTF-Blender-IO authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
def reload_package(module_dict_main):
    import importlib
    from pathlib import Path

    def reload_package_recursive(current_dir, module_dict):
        for path in current_dir.iterdir():
            if "__init__" in str(path) or path.stem not in module_dict:
                continue

            if path.is_file() and path.suffix == ".py":
                importlib.reload(module_dict[path.stem])
            elif path.is_dir():
                reload_package_recursive(path, module_dict[path.stem].__dict__)

    reload_package_recursive(Path(__file__).parent, module_dict_main)


if "bpy" in locals():
    reload_package(locals())
# End of stuff taken from glTF

import bpy
from bpy_extras.io_utils import ExportHelper
from bpy.props import BoolProperty, EnumProperty
from bpy.types import Operator
from .msh_scene import create_scene
from .msh_scene_save import save_scene
from .msh_material_properties import *

# ExportHelper is a helper class, defines filename and
# invoke() function which calls the file selector.
class ExportSomeData(Operator, ExportHelper):
    """This appears in the tooltip of the operator and in the generated docs"""
    bl_idname = "export_test.some_data"  # important since its how bpy.ops.import_test.some_data is constructed
    bl_label = "Export Some Data"

    # ExportHelper mixin class uses this
    filename_ext = ".msh"

    filter_glob: StringProperty(
        default="*.msh",
        options={'HIDDEN'},
        maxlen=255,  # Max internal buffer length, longer would be clamped.
    )

    # List of operator properties, the attributes will be assigned
    # to the class instance from the operator settings before calling.
    use_setting: BoolProperty(
        name="Example Boolean",
        description="Example Tooltip",
        default=True,
    )

    type: EnumProperty(
        name="Example Enum",
        description="Choose between two items",
        items=(
            ('OPT_A', "First Option", "Description one"),
            ('OPT_B', "Second Option", "Description two"),
        ),
        default='OPT_A',
    )

    def execute(self, context):
        with open(self.filepath, 'wb') as output_file:
            save_scene(output_file, create_scene())

        return {'FINISHED'}

# Only needed if you want to add into a dynamic menu
def menu_func_export(self, context):
    self.layout.operator(ExportSomeData.bl_idname, text="SWBF msh (.msh)")

def register():
    bpy.utils.register_class(MaterialProperties)
    bpy.utils.register_class(MaterialPropertiesPanel)
    bpy.utils.register_class(ExportSomeData)

    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)
    bpy.types.Material.swbf_msh = bpy.props.PointerProperty(type=MaterialProperties)


def unregister():
    bpy.utils.unregister_class(MaterialProperties)
    bpy.utils.unregister_class(MaterialPropertiesPanel)
    bpy.utils.unregister_class(ExportSomeData)
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)

if __name__ == "__main__":
    register()

    # test call
    # bpy.ops.export_test.some_data('INVOKE_DEFAULT')