Let IFCClash be used either as a standalone or as a library

src/ifcblenderexport/ifcclash/ifcclash.py

@@ -6,6 +6,7 @@ import ifcopenshell.geom
 import multiprocessing
 import numpy as np
 import json
+import sys
 import argparse
 import logging
 
@@ -145,6 +146,7 @@ class IfcClasher:
             element.ObjectPlacement.RelativePlacement.RefDirection.DirectionRatios = (1., 0., 0.)
 
 
+if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description='Clashes geometry between two IFC files')
     parser.add_argument(
@@ -161,24 +163,15 @@ parser.add_argument(
         type=str,
         help='The JSON diff file to output. Defaults to clashes.json',
         default='clashes.json')
-parser.add_argument(
-    '-l',
-    '--legacy',
-    default=False,
-    action='store_true',
-    help='Use legacy element parser')
     args = parser.parse_args()
 
     class IfcClashSettings:
         def __init__(self):
             self.logger = None
-        self.should_use_legacy = False
 
     settings = IfcClashSettings()
-settings.should_use_legacy = args.legacy
     settings.logger = logging.getLogger('Clash')
     settings.logger.setLevel(logging.DEBUG)
-import sys
     handler = logging.StreamHandler(sys.stdout)
     handler.setLevel(logging.DEBUG)
     settings.logger.addHandler(handler)