Implement transaction printing.

docs/config_core/core_debug_sqlite.ini

@@ -7,3 +7,7 @@ Path = pos.db
 
 [FLASK]
 SECRET_KEY = CHANGE_ME_NOW!
+
+[PRINTER]
+Host = 192.168.1.100
+Post = 9100

docs/config_core/core_production_mysql.ini

@@ -11,3 +11,7 @@ Password = secret
 
 [FLASK]
 SECRET_KEY = CHANGE_ME_NOW!
+
+[PRINTER]
+Host = 192.168.1.100
+Post = 9100

requirements.txt

@@ -8,3 +8,4 @@ tabulate
 PyYAML
 flask>=0.12.0
 flask_login>=0.4.0
+python-escpos

web.py

@@ -1,4 +1,6 @@
 from datetime import datetime
+from time import sleep
+import escpos.printer
 
 from flask import Flask, redirect, request, render_template, flash
 from flask_login import LoginManager, login_user, logout_user, login_required
@@ -11,11 +13,20 @@ from pos.database import Database, User, Product, Event, Transaction, Order
 config = Config()
 debug = config.core['GENERAL'].getboolean('Debug', False)
 conf_db = config.core['DATABASE']
+conf_printer = config.core['PRINTER']
 conf_flask = config.core['FLASK']
 
 init_logging(config.logging)
 log = get_logger('web')
 
+printer = escpos.printer.Network(
+    conf_printer['Host'],
+    port=conf_printer.getint('Port'),
+    timeout=15)
+
+
+db = Database(**conf_db)
+
 app = Flask(__name__)
 app.config.update(
     debug=debug,
@@ -27,8 +38,6 @@ login_manager.init_app(app)
 login_manager.login_view = 'login'
 login_manager.login_message_category = 'error'
 
-db = Database(**conf_db)
-
 
 @login_manager.user_loader
 def load_user(uid):
@@ -110,6 +119,43 @@ def sell_page():
                            title='Sell', event=event, products=products)
 
 
+def print_orders(event, orders):
+    printer.open()
+
+    printer.set(align='CENTER')
+    printer.image('static/img/macao-logo-printer.png', impl='bitImageColumn')
+
+    printer.set(align='CENTER', text_type='B')
+    printer.text(event.name.upper())
+    printer.text("\n\n")
+
+    for o in orders:
+        printer.set(align='LEFT', width=2, height=2)
+        printer.text("{} x {}".format(o.quantity, o.product.name.upper()))
+        printer.text("\n")
+
+    printer.text("\n")
+
+    printer.cut()
+    printer.close()
+    sleep(0.7)
+
+
+def print_transaction(transaction):
+    categorized_orders = {}
+
+    for o in transaction.orders:
+        uid = o.product.category_uid
+
+        if not categorized_orders.get(uid, False):
+            categorized_orders[uid] = []
+
+        categorized_orders[uid].append(o)
+
+    for cat, orders in categorized_orders.items():
+        print_orders(transaction.event, orders)
+
+
 @app.route('/sell', methods=['POST'])
 @login_required
 def sell():
@@ -135,6 +181,8 @@ def sell():
 
         transaction = Transaction(event_uid=event.uid, orders=orders)
         session.add(transaction)
+        session.flush()
+        print_transaction(transaction)
 
     flash("Success!", 'success')
     return sell_page()