Refactor cli.py

cli.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import click
 from tabulate import tabulate
 from datetime import datetime
@@ -15,6 +16,15 @@ log = get_logger('cli')
 db = Database(**conf_db)
 
 
+def get_total(transaction):
+    return sum(o.product.price * o.quantity
+               for o in transaction.orders)
+
+
+def get_income(event):
+    return sum(get_total(t) for t in event.transactions)
+
+
 @click.group()
 def cli():
     pass
@@ -44,13 +54,13 @@ def user_add(username, password):
 
 @user.command('list')
 def user_list():
-    users = None
     with db.get_session() as session:
         users = session.query(User).all()
-    if len(users) == 0:
+
+    if users:
+        print(tabulate_users(users))
+    else:
         print("No users found.")
-        return
-    print(tabulate_users(users))
 
 
 @cli.group('event')
@@ -60,12 +70,11 @@ def event():
 
 def tabulate_events(events):
     tab = [["UID", "Name", "Starts at", "Ends at", "Income", "Created at"]]
+
     for e in events:
-        sum = 0
-        for t in e.transactions:
-            for o in t.orders:
-                sum += o.product.price * o.quantity
-        tab.append([e.uid, e.name, e.starts_at, e.ends_at, sum, e.created_at])
+        tab.append([e.uid, e.name, e.starts_at,
+                    e.ends_at, get_income(e), e.created_at])
+
     return tabulate(tab, headers='firstrow')
 
 
@@ -77,6 +86,7 @@ def event_add(name, start, end):
     start = datetime.strptime(start, "%Y-%m-%d %H:%M")
     end = datetime.strptime(end, "%Y-%m-%d %H:%M")
     event = Event(name=name, starts_at=start, ends_at=end)
+
     with db.get_session() as session:
         session.add(event)
     print("Event succesfully added.")
@@ -84,13 +94,13 @@ def event_add(name, start, end):
 
 @event.command('list')
 def event_list():
-    events = None
     with db.get_session() as session:
         events = session.query(Event).all()
-    if len(events) == 0:
+
+    if events:
+        print(tabulate_events(events))
+    else:
         print("No events found.")
-        return
-    print(tabulate_events(events))
 
 
 @cli.group('product')
@@ -117,13 +127,13 @@ def product_add(name, price):
 
 @product.command('list')
 def product_list():
-    products = None
     with db.get_session() as session:
         products = session.query(Product).all()
-    if len(products) == 0:
+
+    if products:
+        print(tabulate_products(products))
+    else:
         print("No products found.")
-        return
-    print(tabulate_products(products))
 
 
 @cli.group('transaction')
@@ -134,39 +144,29 @@ def transaction():
 def tabulate_orders(orders):
     tab = [["Product", "Price", "Quantity", "Total"]]
     for o in orders:
-        if o.quantity != 0:
+        if o.quantity > 0:
             tab.append([o.product.name, o.product.price, o.quantity,
                         o.product.price * o.quantity])
     return tabulate(tab, headers='firstrow')
 
 
 def print_transactions(transactions):
-    sum = 0
     for t in transactions:
         print("Listing transaction #{} ({}):".format(t.uid, t.created_at))
         print(tabulate_orders(t.orders))
-
-        tot = 0
-        for o in t.orders:
-            tot += o.product.price * o.quantity
-        sum += tot
-        print("Total: {}".format(tot))
+        print("Total:", get_total(t))
         print()
 
-    print("Total income: {}".format(sum))
-    print()
-
 
 @transaction.command('list')
 def transaction_list():
     with db.get_session() as session:
         transactions = session.query(Transaction).all()
 
-    if len(transactions) == 0:
+    if transactions:
+        print_transactions(transactions)
+    else:
         print("No transactions found.")
-        return
-
-    return print_transactions(transactions)
 
 
 if __name__ == '__main__':