feat(pick list): group items based on item code and warehouse before printing picklist

erpnext/stock/doctype/pick_list/pick_list.json

@@ -18,7 +18,9 @@
   "get_item_locations",
   "section_break_6",
   "locations",
-  "amended_from"
+  "amended_from",
+  "print_settings_section",
+  "group_same_items"
  ],
  "fields": [
   {
@@ -110,14 +112,28 @@
    "options": "STO-PICK-.YYYY.-",
    "reqd": 1,
    "set_only_once": 1
+  },
+  {
+   "fieldname": "print_settings_section",
+   "fieldtype": "Section Break",
+   "label": "Print Settings"
+  },
+  {
+   "allow_on_submit": 1,
+   "default": "0",
+   "fieldname": "group_same_items",
+   "fieldtype": "Check",
+   "label": "Group Same Items",
+   "print_hide": 1
   }
  ],
  "is_submittable": 1,
  "links": [],
- "modified": "2020-03-17 11:38:41.932875",
+ "modified": "2021-10-05 15:08:40.369957",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Pick List",
+ "naming_rule": "By \"Naming Series\" field",
  "owner": "Administrator",
  "permissions": [
   {
@@ -184,4 +200,4 @@
  "sort_field": "modified",
  "sort_order": "DESC",
  "track_changes": 1
-}
+}

erpnext/stock/doctype/pick_list/pick_list.py

@@ -121,6 +121,32 @@ class PickList(Document):
 				and (self.for_qty is None or self.for_qty == 0):
 			frappe.throw(_("Qty of Finished Goods Item should be greater than 0."))
 
+	def before_print(self, settings=None):
+		if self.get("group_same_items"):
+			self.group_similar_items()
+
+	def group_similar_items(self):
+		group_item_qty = {}
+		group_picked_qty = {}
+		count = 0
+
+		for item in self.locations:
+			group_item_qty[(item.item_code, item.warehouse)] = group_item_qty.get((item.item_code,item.warehouse), 0) + item.qty
+			group_picked_qty[(item.item_code, item.warehouse)] = group_picked_qty.get((item.item_code,item.warehouse), 0) + item.picked_qty
+
+		duplicate_list = []
+		for item in self.locations:
+			if (item.item_code, item.warehouse) in group_item_qty:
+				count += 1
+				item.qty = group_item_qty[(item.item_code, item.warehouse)]
+				item.picked_qty = group_picked_qty[(item.item_code, item.warehouse)]
+				item.stock_qty = group_item_qty[(item.item_code, item.warehouse)]
+				item.idx = count
+				del group_item_qty[(item.item_code, item.warehouse)]
+			else:
+				duplicate_list.append(item)
+		for item in duplicate_list:
+			self.remove(item)
 
 def validate_item_locations(pick_list):
 	if not pick_list.locations: