Improve layer stack handling

gerbonara/cam.py

@@ -444,5 +444,8 @@ class LazyCamFile:
 
     def save(self, filename, *args, **kwargs):
         """ Copy this Gerber file to the new path. """
-        shutil.copy(self.original_path, filename)
+        if 'instance' in self.__dict__: # instance has been loaded, and might have been modified
+            self.instance.save(filename, *args, **kwargs)
+        else:
+            shutil.copy(self.original_path, filename)
 

gerbonara/excellon.py

@@ -245,6 +245,16 @@ class ExcellonFile(CamFile):
         """ Test if there are multiple plating values used in this file. """
         return len({obj.plated for obj in self.objects}) > 1
 
+    @property
+    def is_plated_tristate(self):
+        if self.is_plated:
+            return True
+
+        if self.is_nonplated:
+            return False
+
+        return None
+
     def append(self, obj_or_comment):
         """ Add a :py:class:`.GraphicObject` or a comment (str) to this file. """
         if isinstance(obj_or_comment, str):
@@ -252,11 +262,11 @@ class ExcellonFile(CamFile):
         else:
             self.objects.append(obj_or_comment)
 
-    def to_excellon(self):
+    def to_excellon(self, plated=None, errors='raise'):
         """ Counterpart to :py:meth:`~.rs274x.GerberFile.to_excellon`. Does nothing and returns :py:obj:`self`. """
         return self
 
-    def to_gerber(self):
+    def to_gerber(self, errros='raise'):
         """ Convert this excellon file into a :py:class:`~.rs274x.GerberFile`. """
         apertures = {}
         out = GerberFile()
@@ -274,14 +284,18 @@ class ExcellonFile(CamFile):
     def generator(self):
         return self.generator_hints[0] if self.generator_hints else None
 
-    def merge(self, other):
+    def merge(self, other, mode='ignored', keep_settings=False):
         if other is None:
             return
+        
+        if not isinstance(other, ExcellonFile):
+            other = other.to_excellon(plated=self.is_plated_tristate)
 
         self.objects += other.objects
         self.comments += other.comments
         self.generator_hints = None
-        self.import_settings = None
+        if not keep_settings:
+            self.import_settings = None
 
     @classmethod
     def open(kls, filename, plated=None, settings=None, external_tools=None):

gerbonara/layers.py

@@ -113,16 +113,22 @@ class NamingScheme:
 def _match_files(filenames):
     matches = {}
     for generator, rules in MATCH_RULES.items():
+        already_matched = set()
         gen = {}
         matches[generator] = gen
         for layer, regex in rules.items():
             for fn in filenames:
+                if fn in already_matched:
+                    continue
+
                 if (m := re.fullmatch(regex, fn.name, re.IGNORECASE)):
                     if layer == 'inner copper':
                         target = 'inner_' + ''.join(e or '' for e in m.groups()) + ' copper'
                     else:
                         target = layer
+
                     gen[target] = gen.get(target, []) + [fn]
+                    already_matched.add(fn)
     return matches
 
 
@@ -615,8 +621,10 @@ class LayerStack:
 
         if self.drill_pth is not None:
             yield get_name('plated drill', self.drill_pth), self.drill_pth
+
         if self.drill_npth is not None:
             yield get_name('nonplated drill', self.drill_npth), self.drill_npth
+
         for layer in self._drill_layers:
             yield get_name('unknown drill', layer), layer
 
@@ -872,8 +880,7 @@ class LayerStack:
                     npth_out.append(obj)
 
         self.drill_pth, self.drill_npth = pth_out, npth_out
-        self._drill_layers = unknown_out if unknown_out else None
-        self._drill_layers = []
+        self._drill_layers = [unknown_out] if unknown_out else []
 
     @property
     def drill_layers(self):

gerbonara/rs274x.py

@@ -73,7 +73,7 @@ class GerberFile(CamFile):
         self.apertures = [] # FIXME get rid of this? apertures are already in the objects.
         self.file_attrs = file_attrs or {}
 
-    def to_excellon(self, plated=None):
+    def to_excellon(self, plated=None, errors='raise'):
         """ Convert this excellon file into a :py:class:`~.excellon.ExcellonFile`. This will convert interpolated lines
         into slots, and circular aperture flashes into holes. Other features such as ``G36`` polygons or flashes with
         non-circular apertures will result in a :py:obj:`ValueError`. You can, of course, programmatically remove such
@@ -83,7 +83,15 @@ class GerberFile(CamFile):
         for obj in self.objects:
             if not (isinstance(obj, go.Line) or isinstance(obj, go.Arc) or isinstance(obj, go.Flash)) or \
                 not isinstance(obj.aperture, apertures.CircleAperture):
-                raise ValueError(f'Cannot convert {obj} to excellon!')
+                    if errors == 'raise':
+                        raise ValueError(f'Cannot convert {obj} to excellon.')
+                    elif errors == 'warn':
+                        warnings.warn(f'Gerber to Excellon conversion: Cannot convert {obj} to excellon.')
+                        continue
+                    elif errors == 'ignore':
+                        continue
+                    else:
+                        raise ValueError('Invalid "errors" parameter. Allowed values: "raise", "warn" or "ignore".')
 
             if not (new_tool := new_tools.get(id(obj.aperture))):
                 # TODO plating?
@@ -92,9 +100,9 @@ class GerberFile(CamFile):
             
         return ExcellonFile(objects=new_objs, comments=self.comments)
 
-    def to_gerber(self):
+    def to_gerber(self, errors='raise'):
         """ Counterpart to :py:meth:`~.excellon.ExcellonFile.to_gerber`. Does nothing and returns :py:obj:`self`. """
-        return
+        return self
 
     def merge(self, other, mode='above', keep_settings=False):
         """ Merge ``other`` into ``self``, i.e. add all objects that are in ``other`` to ``self``. This resets
@@ -110,6 +118,8 @@ class GerberFile(CamFile):
         if other is None:
             return
 
+        other = other.to_gerber()
+
         if not keep_settings:
             self.import_settings = None
         self.comments += other.comments