Optionally restrict stock label printing based on item unit

Add an option to control printing of stock labels for items that
will not be individually checked during a stock take. This option
defaults to "off".

Add an option to print a delivery checklist on the receipt printer.

Closes #269 on github.

quicktill/delivery.py

@@ -1,7 +1,9 @@
 from . import ui, stock, td, keyboard, printer, tillconfig, stocktype
 from . import user, usestock
+from . import config
 from decimal import Decimal
 from .models import Delivery, Supplier, StockUnit, StockItem
+from .models import StockType, Unit
 from .models import penny
 from .plugins import InstancePluginMount
 import datetime
@@ -12,6 +14,18 @@
 log = logging.getLogger(__name__)
 
 
+# Do we print stock labels for items where
+# StockItem.stocktype.unit.stocktake_by_items is False? (I.e. where
+# individual stock items will not be checked, only a total will be
+# entered.)
+label_everything = config.BooleanConfigItem(
+    'core:label_everything', False, display_name="Label all stock items?",
+    description="Should stock labels be printed for all items in a delivery, "
+    "including items that will not be checked individually during a stock "
+    "take? (I.e. where the Unit for the item's stock type has the stock take "
+    "method set to 'total quantity'.)")
+
+
 @user.permission_required('deliveries', "List deliveries")
 def deliverymenu():
     """Display a list of deliveries and call the edit function.
@@ -241,13 +255,37 @@ def deleteline(self):
                 title="Confirm Delete",
                 keymap={keyboard.K_CASH: (self.reallydeleteline, None, True)})
 
+    def _label_query(self):
+        q = td.s.query(StockItem)\
+                .join(StockType)\
+                .join(Unit)\
+                .filter(StockItem.deliveryid == self.dn)\
+                .order_by(StockItem.id)
+        if not label_everything():
+            q = q.filter(Unit.stocktake_by_items == True)
+        return q
+
+    def _print_labels(self, label_printer):
+        labels = self._label_query().all()
+        with label_printer as f:
+            for l in labels:
+                printer.stock_label(f, l)
+
     def printout(self):
         if self.dn is None:
             return
-        menu = [(f"Print labels on {x}",
-                 printer.label_print_delivery, (x, self.dn))
-                for x in tillconfig.label_printers]
+        num_labels = self._label_query().count()
+        menu = []
+        if tillconfig.receipt_printer:
+            menu.append(("Print a delivery checklist",
+                         printer.print_delivery_checklist,
+                         (tillconfig.receipt_printer, self.dn)))
+
+        if num_labels > 0:
+            menu.extend((f"Print labels on {x}", self._print_labels, (x,))
+                        for x in tillconfig.label_printers)
         ui.automenu(menu, title="Delivery print options",
+                    blurb=[f"There are {num_labels} stock labels to print."],
                     colour=ui.colour_confirm)
 
     def reallyconfirm(self):

quicktill/printer.py

@@ -235,6 +235,26 @@ def print_deferred_payment_wrapper(printer, trans, paytype, amount, user_name):
             d.printline()
 
 
+def print_delivery_checklist(printer, dn):
+    d = td.s.query(Delivery).get(dn)
+    if not d:
+        return
+    printtime = ui.formattime(now())
+    with printer as p:
+        p.printline(f"\tDelivery {dn} checklist")
+        p.printline(f"\tFrom {d.supplier.name}")
+        if d.docnumber:
+            p.printline(f"\tRef {d.docnumber}")
+        p.printline(f"\tPrinted {printtime}")
+        p.printline()
+        for item in d.items:
+            p.printline(f"{item.id}: {item.stocktype}")
+            p.printline(f"{item.description}\t\t[  ]")
+            p.printline()
+        p.printline()
+        p.printline()
+
+
 def stock_label(f, d):
     """Draw a stock label (d) on a PDF canvas (f). d is a Stock instance
     """
@@ -272,13 +292,6 @@ def fits(s):
     f.showPage()
 
 
-def label_print_delivery(p, delivery):
-    d = td.s.query(Delivery).get(delivery)
-    with p as f:
-        for s in d.items:
-            stock_label(f, s)
-
-
 def print_restock_list(printer, rl):
     """
     Print a list of (stockline,stockmovement) tuples.