Refs #99 -- Improve support for currencies with less than 2 decimal places (#783)

* Refs #99 -- Fix stripe support for zero-decimal currencies

* Add new money formatting method

* Force decimal places in many places

* Locale-aware currency rendering

* Fix currencies in more places

* More currency fixes

src/pretix/base/models/invoices.py

@@ -83,6 +83,7 @@ class Invoice(models.Model):
     foreign_currency_display = models.CharField(max_length=50, null=True, blank=True)
     foreign_currency_rate = models.DecimalField(decimal_places=4, max_digits=10, null=True, blank=True)
     foreign_currency_rate_date = models.DateField(null=True, blank=True)
+
     file = models.FileField(null=True, blank=True, upload_to=invoice_filename)
     internal_reference = models.TextField(blank=True)
 

src/pretix/base/models/tax.py

@@ -8,6 +8,7 @@ from i18nfield.fields import I18nCharField
 
 from pretix.base.decimal import round_decimal
 from pretix.base.models.base import LoggedModel
+from pretix.base.templatetags.money import money_filter
 
 
 class TaxedPrice:
@@ -23,6 +24,13 @@ class TaxedPrice:
     def __repr__(self):
         return '{} + {}% = {}'.format(localize(self.net), localize(self.rate), localize(self.gross))
 
+    def print(self, currency):
+        return '{} + {}% = {}'.format(
+            money_filter(self.net, currency),
+            localize(self.rate),
+            money_filter(self.gross, currency)
+        )
+
 
 TAXED_ZERO = TaxedPrice(
     gross=Decimal('0.00'),
@@ -129,10 +137,12 @@ class TaxRule(LoggedModel):
 
         if base_price_is == 'gross':
             gross = base_price
-            net = gross - round_decimal(base_price * (1 - 100 / (100 + self.rate)))
+            net = round_decimal(gross - (base_price * (1 - 100 / (100 + self.rate))),
+                                self.event.currency if self.event else None)
         elif base_price_is == 'net':
             net = base_price
-            gross = round_decimal(net * (1 + self.rate / 100))
+            gross = round_decimal((net * (1 + self.rate / 100)),
+                                  self.event.currency if self.event else None)
         else:
             raise ValueError('Unknown base price type: {}'.format(base_price_is))
 

src/pretix/base/models/vouchers.py

@@ -1,4 +1,4 @@
-from decimal import Decimal
+from decimal import ROUND_HALF_UP, Decimal
 
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -368,9 +368,15 @@ class Voucher(LoggedModel):
         """
         if self.value is not None:
             if self.price_mode == 'set':
-                return self.value
+                p = self.value
             elif self.price_mode == 'subtract':
-                return max(original_price - self.value, Decimal('0.00'))
+                p = max(original_price - self.value, Decimal('0.00'))
             elif self.price_mode == 'percent':
-                return round_decimal(original_price * (Decimal('100.00') - self.value) / Decimal('100.00'))
+                p = round_decimal(original_price * (Decimal('100.00') - self.value) / Decimal('100.00'))
+            else:
+                p = original_price
+            places = settings.CURRENCY_PLACES.get(self.event.currency, 2)
+            if places < 2:
+                return p.quantize(Decimal('1') / 10 ** places, ROUND_HALF_UP)
+            return p
         return original_price