OMG a ridiculous commit to overhaul import handler config etc.

- register all import/export handlers via setup.py and config
- use "handler key" lookup for all import/export commands
- fix logic bugs w/ CORE -> Trainwreck importer

rattail_corepos/trainwreck/commands.py

@@ -33,4 +33,4 @@ class ImportCore(commands.ImportSubcommand):
     """
     name = 'import-corepos'
     description = __doc__.strip()
-    handler_spec = 'rattail_corepos.trainwreck.importing.corepos:FromCoreToTrainwreck'
+    handler_key = 'to_trainwreck.from_corepos_db_office_trans.import'

rattail_corepos/trainwreck/importing/corepos.py

@@ -37,7 +37,9 @@ class FromCoreToTrainwreck(importing.FromSQLAlchemyHandler, trainwreck_importing
     """
     Import data from CORE-POS into Trainwreck
     """
+    host_key = 'corepos_db_office_trans'
     host_title = "CORE-POS"
+    generic_host_title = 'CORE Office (DB "trans")'
     corepos_dbkey = 'default'
 
     def make_host_session(self):
@@ -150,23 +152,23 @@ class TransactionImporter(FromCore, trainwreck_importing.model.TransactionImport
         current = {}
 
         def collect(detail, i):
-            receipt_number = str(detail.transaction_number)
+
+            system_id = self.make_system_id(detail)
+            if current and current['system_id'] != system_id:
+                transactions.append(dict(current))
+                current.clear()
 
             date_time = detail.date_time
             if date_time:
                 date_time = localtime(self.config, date_time)
                 date_time = make_utc(date_time)
 
-            if current and current['receipt_number'] != receipt_number:
-                transactions.append(dict(current))
-                current.clear()
-
             if not current:
                 current.update({
                     'system': self.enum.TRAINWRECK_SYSTEM_COREPOS,
-                    'system_id': self.make_system_id(detail),
+                    'system_id': system_id,
                     'terminal_id': str(detail.register_number),
-                    'receipt_number': receipt_number,
+                    'receipt_number': str(detail.transaction_number),
                     'cashier_id': str(detail.employee_number) if detail.employee_number else None,
                     'customer_id': str(detail.card_number) if detail.card_number else None,
                     'start_time': date_time,