Add shared GPC search filter, use it for product batch rows.

tailbone/grids/search.py

@@ -37,9 +37,11 @@ from pyramid.renderers import render
 from pyramid_simpleform import Form
 from pyramid_simpleform.renderers import FormRenderer
 
-from rattail.core import Object
 from edbob.util import prettify
 
+from rattail.core import Object
+from rattail.gpc import GPC
+
 
 class SearchFilter(Object):
     """
@@ -228,6 +230,32 @@ def filter_ilike_and_soundex(field):
     return filters
 
 
+def filter_gpc(field):
+    """
+    Returns a filter suitable for a GPC field.
+    """
+
+    def filter_is(q, v):
+        if not v:
+            return q
+        try:
+            return q.filter(field.in_((
+                        GPC(v), GPC(v, calc_check_digit='upc'))))
+        except ValueError:
+            return q
+
+    def filter_not(q, v):
+        if not v:
+            return q
+        try:
+            return q.filter(~field.in_((
+                        GPC(v), GPC(v, calc_check_digit='upc'))))
+        except ValueError:
+            return q
+
+    return {'is': filter_is, 'nt': filter_not}
+
+
 def get_filter_config(prefix, request, filter_map, **kwargs):
     """
     Returns a configuration dictionary for a search form.