kicad: Improve net access

This adds net_name and net_index properties to a bunch of objects that
automatically look into the (net s-expr of the object

gerbonara/cad/kicad/base_types.py

@@ -307,6 +307,29 @@ class ArcPointList:
         yield [kls.name_atom, *(e for elem in value for e in elem.__sexp__(elem))]
 
 
+@sexp_type('net')
+class Net:
+    index: int = 0
+    name: str = ''
+
+
+class NetMixin:
+    def reset_net(self):
+        self.net = Net()
+
+    @property
+    def net_index(self):
+        if self.net is None:
+            return 0
+        return self.net.index
+
+    @property
+    def net_name(self):
+        if self.net is None:
+            return ''
+        return self.net.name
+
+
 @sexp_type('xyz')
 class XYZCoord:
     x: float = 0

gerbonara/cad/kicad/footprints.py

@@ -334,12 +334,6 @@ class Drill:
     offset: Rename(XYCoord) = None
 
 
-@sexp_type('net')
-class NetDef:
-    number: int = None
-    name: str = None
-
-
 @sexp_type('options')
 class CustomPadOptions:
     clearance: Named(AtomChoice(Atom.outline, Atom.convexhull)) = Atom.outline
@@ -376,7 +370,7 @@ class Chamfer:
 
 
 @sexp_type('pad')
-class Pad:
+class Pad(NetMixin):
     number: str = None
     type: AtomChoice(Atom.thru_hole, Atom.smd, Atom.connect, Atom.np_thru_hole) = None
     shape: AtomChoice(Atom.circle, Atom.rect, Atom.oval, Atom.trapezoid, Atom.roundrect, Atom.custom) = None
@@ -395,7 +389,7 @@ class Pad:
     thermal_bridge_width: Named(float) = 0.5
     chamfer_ratio: Named(float) = None
     chamfer: Chamfer = None
-    net: NetDef = None
+    net: Net = None
     tstamp: Timestamp = None
     pin_function: Named(str) = None
     pintype: Named(str) = None
@@ -709,6 +703,10 @@ class Footprint:
         if not self.property_value('Description', None):
             self.set_property('Description', self.descr or '', 0, 0, 0)
 
+    def reset_nets(self):
+        for pad in self.pads:
+            pad.reset_net()
+
     @property
     def pads_by_number(self):
         return {(int(pad.number) if pad.number.isnumeric() else pad.number): pad for pad in self.pads if pad.number}

gerbonara/cad/kicad/pcb.py

@@ -150,12 +150,6 @@ class BoardSetup:
     export_settings: ExportSettings = field(default_factory=ExportSettings)
 
 
-@sexp_type('net')
-class Net:
-    index: int = 0
-    name: str = ''
-
-
 @sexp_type('segment')
 class TrackSegment(BBoxMixin):
     start: Rename(XYCoord) = field(default_factory=XYCoord)