Fix test failures

gerbonara/gerber/__init__.py

@@ -22,4 +22,6 @@ gerbonara provides utilities for working with Gerber (RS-274X) and Excellon
 files in python.
 """
 
-from .layers import load_layer, load_layer_data
+from .rs274x import GerberFile
+from .excellon import ExcellonFile
+from .layers import LayerStack

gerbonara/gerber/excellon.py

@@ -65,7 +65,7 @@ def parse_allegro_ncparam(data, settings=None):
     # want to parse, but sometimes due to user error it doesn't end up in the gerber package. In this case, we want to
     # still be able to extract the same information from the human-readable ncdrill.log.
 
-    if settings is None
+    if settings is None:
         self.settings = FileSettings(number_format=(None, None))
 
     lz_supp, tz_supp = False, False
@@ -172,7 +172,7 @@ class ExcellonFile(CamFile):
         return kls.from_string(filename.read_text(), settings=settings, filename=filename, plated=plated)
 
     @classmethod
-    def from_string(kls, data, settings=None, filename=filename, plated=None):
+    def from_string(kls, data, settings=None, filename=None, plated=None):
         parser = ExcellonParser(settings)
         parser._do_parse(data)
         return kls(objects=parser.objects, comments=parser.comments, import_settings=settings,

gerbonara/gerber/layers.py

@@ -222,7 +222,7 @@ class LayerStack:
 
     def __init__(self, graphic_layers, drill_layers, board_name=None):
         self.graphic_layers = graphic_layers
-        self.-drill_layers = drill_layers
+        self.drill_layers = drill_layers
         self.board_name = board_name
 
     def merge_drill_layers(self):

gerbonara/gerber/rs274x.py

@@ -141,7 +141,7 @@ class GerberFile(CamFile):
         # dedup apertures
         new_apertures = {}
         replace_apertures = {}
-        mock_settings = self.import_settings
+        mock_settings = FileSettings()
         for ap in self.apertures + other.apertures:
             gbr = ap.to_gerber(mock_settings)
             if gbr not in new_apertures:
@@ -825,7 +825,7 @@ class GerberParser:
                     self.layer_hints.append('bottom silk')
             elif 'ETCH' in cmt:
                 _1, _2, name = cmt.partition('/')
-                name = re.sub('\W+', '_', name)
+                name = re.sub(r'\W+', '_', name)
                 self.layer_hints.append(f'{name} copper')
 
         else: