Add config for supported vendor catalog parsers

also explicitly set "native value" for all configuration checkbox
fields, since apparently it will send `'false'` by default...

tailbone/views/batch/vendorcatalog.py

@@ -39,6 +39,7 @@ from webhelpers2.html import tags
 from tailbone import forms
 from tailbone.views.batch import FileBatchMasterView
 from tailbone.diffs import Diff
+from tailbone.db import Session
 
 
 log = logging.getLogger(__name__)
@@ -346,6 +347,47 @@ class VendorCatalogView(FileBatchMasterView):
         ])
         return settings
 
+    def configure_get_context(self):
+        context = super(VendorCatalogView, self).configure_get_context()
+        app = self.get_rattail_app()
+        vendor_handler = app.get_vendor_handler()
+
+        Parsers = vendor_handler.get_all_catalog_parsers()
+        Supported = vendor_handler.get_supported_catalog_parsers()
+        context['catalog_parsers'] = Parsers
+        context['catalog_parsers_data'] = dict([(Parser.key, Parser in Supported)
+                                                for Parser in Parsers])
+
+        return context
+
+    def configure_gather_settings(self, data):
+        settings = super(VendorCatalogView, self).configure_gather_settings(data)
+        app = self.get_rattail_app()
+        vendor_handler = app.get_vendor_handler()
+
+        supported = []
+        for Parser in vendor_handler.get_all_catalog_parsers():
+            name = 'catalog_parser_{}'.format(Parser.key)
+            if data.get(name) == 'true':
+                supported.append(Parser.key)
+        settings.append({'name': 'rattail.vendors.supported_catalog_parsers',
+                         'value': ', '.join(supported)})
+
+        return settings
+
+    def configure_remove_settings(self):
+        super(VendorCatalogView, self).configure_remove_settings()
+        model = self.model
+        names = [
+            'rattail.vendors.supported_catalog_parsers',
+            'tailbone.batch.vendorcatalog.supported_parsers', # deprecated
+        ]
+
+        Session().query(model.Setting)\
+                 .filter(model.Setting.name.in_(names))\
+                 .delete(synchronize_session=False)
+
+
 # TODO: deprecate / remove this
 VendorCatalogsView = VendorCatalogView