Add basic Buefy support for default SelectWidget template

tailbone/templates/deform/select.pt

@@ -6,9 +6,11 @@
      css_class css_class|field.widget.css_class;
      unicode unicode|str;
      optgroup_class optgroup_class|field.widget.optgroup_class;
-     multiple multiple|field.widget.multiple;"
+     multiple multiple|field.widget.multiple;
+     use_buefy use_buefy|0;"
      tal:omit-tag="">
 
+  <div tal:condition="not use_buefy" tal:omit-tag="">
   <input type="hidden" name="__start__" value="${name}:sequence"
          tal:condition="multiple" />
   <div class="select">
@@ -51,4 +53,36 @@
       }
     );
   </script>
+  </div>
+
+  <div tal:condition="use_buefy" tal:omit-tag="">
+    <b-select tal:attributes="name name;
+                              id oid;
+                              placeholder '(please choose)';
+                              class string: form-control ${css_class or ''};
+                              multiple multiple;
+                              size size;
+                              style style;">
+
+      <tal:loop tal:repeat="item values">
+        <optgroup tal:condition="isinstance(item, optgroup_class)"
+                  tal:attributes="label item.label">
+          <option tal:repeat="(value, description) item.options"
+                  tal:attributes="
+                  selected python:field.widget.get_select_value(cstruct, value);
+                  class css_class;
+                  label field.widget.long_label_generator and description;
+                  value value"
+                  tal:content="field.widget.long_label_generator and field.widget.long_label_generator(item.label, description) or description"/>
+        </optgroup>
+        <option tal:condition="not isinstance(item, optgroup_class)"
+                tal:attributes="
+                selected python:field.widget.get_select_value(cstruct, item[0]);
+                class css_class;
+                value item[0]">${item[1]}</option>
+      </tal:loop>
+
+    </b-select>
+  </div>
+
 </div>