Add bgcolor attribute to connectors and cables

This solves the wireviz#210 suggestion to render the top/title row of
the graph nodes with this bgcolor.

src/wireviz/DataClasses.py

@@ -85,6 +85,7 @@ def description(self) -> str:
 @dataclass
 class Connector:
     name: Designator
+    bgcolor: Optional[Color] = None
     manufacturer: Optional[MultilineHypertext] = None
     mpn: Optional[MultilineHypertext] = None
     pn: Optional[Hypertext] = None
@@ -167,6 +168,7 @@ def get_qty_multiplier(self, qty_multiplier: Optional[ConnectorMultiplier]) -> i
 @dataclass
 class Cable:
     name: Designator
+    bgcolor: Optional[Color] = None
     manufacturer: Union[MultilineHypertext, List[MultilineHypertext], None] = None
     mpn: Union[MultilineHypertext, List[MultilineHypertext], None] = None
     pn: Union[Hypertext, List[Hypertext], None] = None

src/wireviz/Harness.py

@@ -11,8 +11,8 @@
 from wireviz import wv_colors, __version__, APP_NAME, APP_URL
 from wireviz.DataClasses import Connector, Cable
 from wireviz.wv_colors import get_color_hex
-from wireviz.wv_gv_html import nested_html_table, html_colorbar, html_image, \
-    html_caption, remove_links, html_line_breaks
+from wireviz.wv_gv_html import nested_html_table, html_bgcolor, html_colorbar, \
+    html_image, html_caption, remove_links, html_line_breaks
 from wireviz.wv_bom import manufacturer_info_field, component_table_entry, \
     get_additional_component_table, bom_list, generate_bom
 from wireviz.wv_html import generate_html_output
@@ -113,7 +113,7 @@ def create_graph(self) -> Graph:
 
             html = []
 
-            rows = [[remove_links(connector.name) if connector.show_name else None],
+            rows = [[f'{html_bgcolor(connector.bgcolor)}{remove_links(connector.name)}' if connector.show_name else None],
                     [f'P/N: {remove_links(connector.pn)}' if connector.pn else None,
                      html_line_breaks(manufacturer_info_field(connector.manufacturer, connector.mpn))],
                     [html_line_breaks(connector.type),
@@ -194,7 +194,7 @@ def create_graph(self) -> Graph:
                 elif cable.gauge_unit.upper() == 'AWG':
                     awg_fmt = f' ({mm2_equiv(cable.gauge)} mm\u00B2)'
 
-            rows = [[remove_links(cable.name) if cable.show_name else None],
+            rows = [[f'{html_bgcolor(cable.bgcolor)}{remove_links(cable.name)}' if cable.show_name else None],
                     [f'P/N: {remove_links(cable.pn)}' if (cable.pn and not isinstance(cable.pn, list)) else None,
                      html_line_breaks(manufacturer_info_field(
                         cable.manufacturer if not isinstance(cable.manufacturer, list) else None,

src/wireviz/wv_gv_html.py

@@ -4,6 +4,7 @@
 from typing import List, Union
 import re
 
+from wireviz.DataClasses import Color
 from wireviz.wv_colors import translate_color
 from wireviz.wv_helper import remove_links
 
@@ -32,8 +33,13 @@ def nested_html_table(rows):
     html.append('</table>')
     return html
 
-def html_colorbar(color):
-    return f'<tdX bgcolor="{translate_color(color, "HEX")}" width="4">' if color else None
+def html_bgcolor(color: Color, _extra_attr: str = '') -> str:
+    """Return <td> attributes prefix for bgcolor or '' if no color."""
+    return f'<tdX bgcolor="{translate_color(color, "HEX")}"{_extra_attr}>' if color else ''
+
+def html_colorbar(color: Color) -> str:
+    """Return <td> attributes prefix for bgcolor and minimum width or None if no color."""
+    return html_bgcolor(color, ' width="4"') if color else None
 
 def html_image(image):
     from wireviz.DataClasses import Image