extend sqlcustomform to support widget/represent (possible fix to web2py/pydal#127)

gluon/sqlhtml.py

@@ -1205,6 +1205,9 @@ class SQLFORM(FORM):
                 elif field.type == 'boolean':
                     inp = self.widgets.boolean.widget(
                         field, default, _disabled=True)
+                elif isinstance(field.type, SQLCustomType) and callable(field.type.represent):
+                    # SQLCustomType has a represent, use it
+                    inp = field.type.represent(default, record)
                 else:
                     inp = field.formatter(default)
                 if getattr(field, 'show_if', None):
@@ -1246,6 +1249,9 @@ class SQLFORM(FORM):
                     dspval = ''
             elif field.type == 'blob':
                 continue
+            elif isinstance(field.type, SQLCustomType) and callable(field.type.widget):
+                # SQLCustomType has a widget, use it
+                inp = field.type.widget(field, default)
             else:
                 field_type = widget_class.match(str(field.type)).group()
                 field_type = field_type in self.widgets and field_type or 'string'
@@ -2708,6 +2714,9 @@ class SQLFORM(FORM):
                                           _href='%s/%s' % (upload, value))
                         else:
                             value = ''
+                    elif isinstance(field.type, SQLCustomType) and callable(field.type.represent):
+                        # SQLCustomType has a represent, use it
+                        value = field.type.represent(value, row)
                     if isinstance(value, str):
                         value = truncate_string(value, maxlength)
                     elif not isinstance(value, XmlComponent):