__init__.py

bl_info = {
	"name": "VoxWriter",
	"author": "Spyduck",
	"version": (0,2),
	"blender": (2,80,0),
	"location": "File > Export > MagicaVoxel (.vox)",
	"description": "Export to MagicaVoxel .vox",
	"category": "Export"}

import bpy
from bpy_extras.io_utils import ExportHelper
from bpy.props import StringProperty, BoolProperty, IntProperty, EnumProperty
from bpy.types import Operator

class ExportSomeData(Operator, ExportHelper):
	"""Export the selected object to a MagicaVoxel .vox"""
	bl_idname = "export_vox.some_data"
	bl_label = "MagicaVoxel (.vox)"

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

	filter_glob: StringProperty(
		default="*.vox",
		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.
	voxel_detail: IntProperty(
		name="Voxel Detail",
		description="Voxel Detail",
		default=32,
	)
	use_default_palette: BoolProperty(
		name="Use default palette",
		description="Use default palette",
		default=False,
	)
	def execute(self, context):
		from .writer import voxelize
		print("running voxelize...")
		voxelize(context.active_object, self.filepath, vox_detail=max(0,min(126,self.voxel_detail)), use_default_palette=self.use_default_palette)
		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="MagicaVoxel (.vox)")


def register():
	bpy.utils.register_class(ExportSomeData)
	bpy.types.TOPBAR_MT_file_export.append(menu_func_export)


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


if __name__ == "__main__":
	register()

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