product_print_zpl_barcode: Add support for barcode generation

Add support for EAN-8 (in additional to EAN-13)

product_print_zpl_barcode/models/__init__.py

@@ -0,0 +1 @@
+from . import product

product_print_zpl_barcode/models/product.py

@@ -0,0 +1,67 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 Akretion France (http://www.akretion.com/)
+# @author: Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+from stdnum.ean import calc_check_digit
+
+
+class ProductTemplate(models.Model):
+    _inherit = "product.template"
+
+    must_print_barcode = fields.Boolean(
+        string="Must Print Barcode",
+        help="Enable that option for products for which you must "
+        "print a barcode upon reception in stock.")
+
+    def generate_barcode_from_product_template(self):
+        self.ensure_one()
+        if self.product_variant_count != 1:
+            raise UserError(_(
+                "You cannot call the method "
+                "generate_barcode_from_product_template on product '%s' "
+                "because it has %d variants and not just one.")
+                % (self.display_name, self.product_variant_count))
+        return self.product_variant_ids[0].generate_barcode_from_product_product()
+
+    def print_zpl_barcode_from_product_template(self):
+        self.ensure_one()
+        if self.product_variant_count != 1:
+            raise UserError(_(
+                "You cannot call the method "
+                "print_zpl_barcode_from_product_template on product '%s' "
+                "because it has %d variants and not just one.")
+                % (self.display_name, self.product_variant_count))
+        action = self.env.ref(
+            'product_print_zpl_barcode.product_print_zpl_barcode_action').read()[0]
+        action['context'] = {
+            'active_id': self.product_variant_ids[0].id,
+            'active_model': 'product.product',
+            }
+        return action
+
+
+class ProductProduct(models.Model):
+    _inherit = 'product.product'
+
+    def generate_barcode_from_product_product(self):
+        self.ensure_one()
+        if self.barcode:
+            raise UserError(_(
+                "The product '%s' already has a barcode.") % self.display_name)
+        barcode_without_checksum = self.env['ir.sequence'].next_by_code(
+            'private.product.barcode')
+        if len(barcode_without_checksum) not in (7, 12):
+            raise UserError(_(
+                "The sequence 'private.product.barcode' is not properly "
+                "configured. The generated sequence should have 7 digits "
+                "(for EAN-8) or 12 digits (for EAN-13). "
+                "It currently has %d digits." % len(barcode_without_checksum)))
+        checksum = calc_check_digit(barcode_without_checksum)
+        barcode = barcode_without_checksum + str(checksum)
+        self.write({
+            'barcode': barcode,
+            'must_print_barcode': True,
+            })