Make prefix for autogenerated component names configurable

`edotor.net` does not seem to like leading underscores, which makes GraphViz debugging difficult.

src/wireviz/DataClasses.py

@@ -42,6 +42,8 @@ MetadataKeys = PlainText  # Literal['title', 'description', 'notes', ...]
 
 Side = Enum("Side", "LEFT RIGHT")
 
+AUTOGENERATED_PREFIX = "AUTOGENERATED_"
+
 
 class Metadata(dict):
     pass
@@ -163,6 +165,10 @@ class Connector:
     ignore_in_bom: bool = False
     additional_components: List[AdditionalComponent] = field(default_factory=list)
 
+    @property
+    def is_autogenerated(self):
+        return self.name.startswith(AUTOGENERATED_PREFIX)
+
     def __post_init__(self) -> None:
 
         if isinstance(self.image, dict):
@@ -196,8 +202,7 @@ class Connector:
             raise Exception("Pins are not unique")
 
         if self.show_name is None:
-            # hide designators for simple and for auto-generated connectors by default
-            self.show_name = self.style != "simple" and self.name[0:2] != "__"
+            self.show_name = self.style != "simple" and not self.is_autogenerated
 
         if self.show_pincount is None:
             # hide pincount for simple (1 pin) connectors by default
@@ -269,6 +274,10 @@ class Cable:
     ignore_in_bom: bool = False
     additional_components: List[AdditionalComponent] = field(default_factory=list)
 
+    @property
+    def is_autogenerated(self):
+        return self.name.startswith(AUTOGENERATED_PREFIX)
+
     def __post_init__(self) -> None:
 
         if isinstance(self.image, dict):
@@ -360,8 +369,7 @@ class Cable:
                     raise Exception("lists of part data are only supported for bundles")
 
         if self.show_name is None:
-            # hide designators for auto-generated cables by default
-            self.show_name = self.name[0:2] != "__"
+            self.show_name = not self.is_autogenerated
 
         if self.show_wirenumbers is None:
             # by default, show wire numbers for cables, hide for bundles

src/wireviz/Harness.py

@@ -17,8 +17,8 @@ from wireviz.DataClasses import (
     MatePin,
     Metadata,
     Options,
-    Tweak,
     Side,
+    Tweak,
 )
 from wireviz.svgembed import embed_svg_images_file
 from wireviz.wv_bom import (
@@ -650,7 +650,6 @@ class Harness:
         graph = self.graph
         return embed_svg_images(graph.pipe(format="svg").decode("utf-8"), Path.cwd())
 
-
     def output(
         self,
         filename: (str, Path),

src/wireviz/wireviz.py

@@ -10,7 +10,7 @@ import yaml
 if __name__ == "__main__":
     sys.path.insert(0, str(Path(__file__).parent.parent))  # add src/wireviz to PATH
 
-from wireviz.DataClasses import Metadata, Options, Tweak
+from wireviz.DataClasses import AUTOGENERATED_PREFIX, Metadata, Options, Tweak
 from wireviz.Harness import Harness
 from wireviz.wv_helper import (
     expand,
@@ -164,7 +164,7 @@ def parse(
                 autogenerated_designators[template] = (
                     autogenerated_designators.get(template, 0) + 1
                 )
-                designator = f"__{template}_{autogenerated_designators[template]}"
+                designator = f"{AUTOGENERATED_PREFIX}{template}_{autogenerated_designators[template]}"
             # check if redefining existing component to different template
             if designator in designators_and_templates:
                 if designators_and_templates[designator] != template: