Add strip length specs for connectors (port of upstream PR #446)

Connectors now support a 'strip' property with sleeve and insulation
length specifications, rendered in the diagram node and available in
the data model for BOM/manufacturing use.

src/wireviz/wv_dataclasses.py

@@ -293,6 +293,42 @@ class AdditionalComponent(GraphicalComponent):
             self.explicit_qty = False
 
 
+@dataclass
+class StripSpec:
+    """Strip length specification for sleeve or insulation."""
+    length: float = 0
+    length_unit: str = "mm"
+
+    def __str__(self) -> str:
+        return f"{self.length} {self.length_unit}" if self.length > 0 else ""
+
+
+@dataclass
+class Strip:
+    """Wire stripping specifications for a connector."""
+    sleeve: Optional[StripSpec] = None
+    insulation: Optional[StripSpec] = None
+
+    def __post_init__(self) -> None:
+        if isinstance(self.sleeve, str):
+            self.sleeve = Strip._parse_length(self.sleeve)
+        if isinstance(self.insulation, str):
+            self.insulation = Strip._parse_length(self.insulation)
+
+    @staticmethod
+    def _parse_length(spec: str) -> StripSpec:
+        parts = spec.strip().split(" ", 1)
+        try:
+            length = float(parts[0])
+        except (ValueError, IndexError):
+            raise Exception(
+                f"Strip length '{spec}' must be a number, "
+                "or number and unit separated by a space"
+            )
+        unit = parts[1].strip() if len(parts) > 1 else "mm"
+        return StripSpec(length=length, length_unit=unit)
+
+
 @dataclass
 class TopLevelGraphicalComponent(GraphicalComponent):  # abstract class
     # component properties
@@ -317,6 +353,7 @@ class Connector(TopLevelGraphicalComponent):
     shorts_hide_lable: bool = False
     # pin information in particular
     pincount: Optional[int] = None
+    strip: Optional[Strip] = None
     pins: List[Pin] = field(default_factory=list)  # legacy
     pinlabels: List[Pin] = field(default_factory=list)  # legacy
     pincolors: List[str] = field(default_factory=list)  # legacy
@@ -367,6 +404,11 @@ class Connector(TopLevelGraphicalComponent):
         if isinstance(self.image, dict):
             self.image = Image(**self.image)
 
+        if isinstance(self.strip, dict):
+            self.strip = Strip(**self.strip)
+        elif self.strip is None:
+            self.strip = Strip()
+
         self.ports_left = False
         self.ports_right = False
         self.visible_pins = {}

src/wireviz/wv_graphviz.py

@@ -63,6 +63,16 @@ def gv_node_component(component: Component) -> Table:
             str(component.color) if component.color else None,
         ]
 
+    # strip info for connectors
+    line_strip = None
+    if isinstance(component, Connector) and (component.strip.sleeve or component.strip.insulation):
+        strip_parts = []
+        if component.strip.sleeve:
+            strip_parts.append(f"Strip sleeve: {component.strip.sleeve}")
+        if component.strip.insulation:
+            strip_parts.append(f"Strip insulation: {component.strip.insulation}")
+        line_strip = [Td(" | ".join(strip_parts))]
+
     if component.additional_parameters:
         line_additional_parameters = nested_table_dict(component.additional_parameters)
     else:
@@ -87,6 +97,7 @@ def gv_node_component(component: Component) -> Table:
         line_name,
         line_pn,
         line_info,
+        line_strip,
         line_additional_parameters,
         line_ports,
         line_image,