Add old_index_value to index_sql (#88)

* tweak to give index_sql awareness of old_index_value so that we have more control over the new_index_value

* address linter complaints

druzhba/mssql.py

@@ -2,8 +2,7 @@
 
 import pymssql
 
-from druzhba.config import CONFIG_DIR
-from druzhba.table import TableConfig, load_query
+from druzhba.table import TableConfig
 
 
 class MSSQLTableConfig(TableConfig):

druzhba/mysql.py

@@ -5,8 +5,7 @@
 import pymysql.cursors
 from pymysql import FIELD_TYPE as ft
 
-from druzhba.config import CONFIG_DIR
-from druzhba.table import TableConfig, load_query
+from druzhba.table import TableConfig
 
 
 class MysqlTypes:

druzhba/postgres.py

@@ -4,8 +4,7 @@
 import psycopg2.extensions
 import psycopg2.extras
 
-from druzhba.config import CONFIG_DIR
-from druzhba.table import TableConfig, load_query
+from druzhba.table import TableConfig
 
 psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
 psycopg2.extensions.register_type(psycopg2.extensions.UNICODEARRAY)

druzhba/table.py

@@ -549,6 +549,12 @@ def run_template_data(self):
             "old_index_value": self.old_index_value,
         }
 
+    @property
+    def index_template_data(self):
+        return {
+            "old_index_value": self.old_index_value
+        }
+
     def _load_old_index_value(self):
         """Sets and gets the index_value property, retrieved from Redshift
 
@@ -660,8 +666,7 @@ def new_index_value(self):
                 query = template.render(
                     db=self.db_template_data,
                     table=self.table_template_data,
-                    # Cannot include the run template data
-                    # here because we do not know the index values yet
+                    index=self.index_template_data,
                 )
                 self._new_index_value = self.query_fetchone(query)["index_value"]