blender_ext.py

#!/usr/bin/env python

from os import path
from sys import argv, stderr
import bpy


def main():
    args = argv[argv.index('--') + 1:]

    # format specific options... change as you like
    args_fbx = dict(
            # global_scale=1.0,
    )

    args_obj = dict(
            # use_image_search=False,
    )

    args_3ds = dict(
            # constrain_size=0.0,
    )

    args_stl = dict(
            use_scene_unit=True
    )

    for filepath in args:
        ext = path.splitext(filepath)[1].lower()

        {'.fbx': bpy.ops.import_scene.fbx(filepath=filepath, **args_fbx),
         '.obj': bpy.ops.import_scene.obj(filepath=filepath, **args_obj),
         '.3ds': bpy.ops.import_scene.autodesk_3ds(filepath=filepath, **args_3ds),
         '.sty': bpy.ops.import_mesh.stl(filepath=filepath, **args_stl)
         }.get(ext, print('Extension {!r} is not known!'.format(ext), file=stderr))

    else:
        print('No files passed', file=stderr)


if __name__ == '__main__':
    main()