Add support for wire length units

src/wireviz/DataClasses.py

@@ -176,6 +176,7 @@ class Cable:
     gauge_unit: Optional[str] = None
     show_equiv: bool = False
     length: float = 0
+    lengthunit: Optional[str] = None
     color: Optional[Color] = None
     wirecount: Optional[int] = None
     shield: Union[bool, Color] = False
@@ -215,6 +216,9 @@ class Cable:
 
         self.connections = []
 
+        if self.lengthunit is None: #Default wire length units to meters if left undeclared
+            self.lengthunit = 'm'
+
         if self.wirecount:  # number of wires explicitly defined
             if self.colors:  # use custom color palette (partly or looped if needed)
                 pass

src/wireviz/Harness.py

@@ -203,7 +203,7 @@ class Harness:
                      f'{cable.wirecount}x' if cable.show_wirecount else None,
                      f'{cable.gauge} {cable.gauge_unit}{awg_fmt}' if cable.gauge else None,
                      '+ S' if cable.shield else None,
-                     f'{cable.length} m' if cable.length > 0 else None,
+                     f'{cable.length} {cable.lengthunit}' if cable.length > 0 else None,
                      cable.color, html_colorbar(cable.color)],
                     '<!-- wire table -->',
                     [html_image(cable.image)],

src/wireviz/wv_bom.py

@@ -67,7 +67,7 @@ def generate_bom(harness):
                                + (f' x {cable.gauge} {cable.gauge_unit}' if cable.gauge else ' wires')
                                + (' shielded' if cable.shield else ''))
                 bom_entries.append({
-                    'item': description, 'qty': cable.length, 'unit': 'm', 'designators': cable.name if cable.show_name else None,
+                    'item': description, 'qty': cable.length, 'unit': cable.lengthunit, 'designators': cable.name if cable.show_name else None,
                     'manufacturer': cable.manufacturer, 'mpn': cable.mpn, 'pn': cable.pn
                 })
             else: