Allow to customize pattern per extra and line

issue4843
review12241002

sale.py

@@ -178,12 +178,19 @@ class SaleExtra(ModelSQL, ModelView, MatchMixin):
             sale.untaxed_amount, sale.company.currency)
 
         for extra in extras:
-            if extra.match(pattern):
+            epattern = pattern.copy()
+            epattern.update(extra.get_pattern(sale))
+            if extra.match(epattern):
                 for line in extra.lines:
-                    if line.match(pattern):
+                    lpattern = epattern.copy()
+                    lpattern.update(line.get_pattern(sale))
+                    if line.match(lpattern):
                         yield line.get_line(sale)
                         break
 
+    def get_pattern(self, sale):
+        return {}
+
     def match(self, pattern):
         pattern = pattern.copy()
         sale_amount = pattern.pop('sale_amount')
@@ -248,6 +255,9 @@ class SaleExtraLine(ModelSQL, ModelView, MatchMixin):
     def default_free():
         return False
 
+    def get_pattern(self, sale):
+        return {}
+
     def match(self, pattern):
         pattern = pattern.copy()
         sale_amount = pattern.pop('sale_amount')