[SCH][Added] Save of unit_name attribute

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `remove_solder_mask_for_dnp` similar to `remove_solder_paste_for_dnp` but
     applied to the solder mask apertures. (#476)
   - `layer_defaults` to specify the default suffix and description. (#504)
+- Schematic format:
+  - Support for *unit names* (#513)
 - Internal templates:
   - 3DRender_top, 3DRender_top_straight, 3DRender_bottom and
     3DRender_bottom_straight: to generate simple and quick 3D renders.

kibot/kicad/v6_sch.py

@@ -788,7 +788,6 @@ class LibComponent(object):
             if parent is None:
                 logger.warning(W_NOLIB + "Component `{}` with more than one `:`".format(comp.name))
         comp.units = []
-        comp.unit_name = ''
         comp.pins = []
         comp.all_pins = []
         comp.unit_count = 1
@@ -869,10 +868,10 @@ class LibComponent(object):
                 comp.unit_count = max(unit, comp.unit_count)
             # UNIT_NAMES...
             elif i_type == 'unit_name':
-                # Units can have custom labels 
-                # The format is not documented but as of V7 is: 
+                # Units can have custom labels
+                # The format is not documented but as of V7 is:
                 # (unit_name "<NAME>")
-                comp.unit_name = i[1] 
+                comp.unit_name = i[1]
             else:
                 raise SchError('Unknown symbol attribute `{}`'.format(i))
             if vis_obj:
@@ -941,6 +940,9 @@ class LibComponent(object):
             sdata.append(_symbol('in_bom', [Symbol(NO_YES[s.in_bom])]))
             sdata.append(_symbol('on_board', [Symbol(NO_YES[s.on_board])]))
         sdata.append(Sep())
+        if s.unit_name is not None:
+            sdata.append(_symbol('unit_name', [s.unit_name]))
+            sdata.append(Sep())
         # Properties
         for f in s.fields:
             fdata = f.write()