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/control/forms/orders.py

@@ -2,7 +2,6 @@ from django import forms
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.db import models
-from django.utils.formats import localize
 from django.utils.timezone import now
 from django.utils.translation import pgettext_lazy, ugettext_lazy as _
 
@@ -12,6 +11,8 @@ from pretix.base.models import (
 )
 from pretix.base.models.event import SubEvent
 from pretix.base.services.pricing import get_price
+from pretix.base.templatetags.money import money_filter
+from pretix.helpers.money import change_decimal_field
 
 
 class ExtendForm(I18nModelForm):
@@ -76,8 +77,8 @@ class SubEventChoiceField(forms.ModelChoiceField):
         p = get_price(self.instance.item, self.instance.variation,
                       voucher=self.instance.voucher,
                       subevent=obj)
-        return '{} – {} ({} {})'.format(obj.name, obj.get_date_range_display(),
-                                        p, self.instance.order.event.currency)
+        return '{} – {} ({})'.format(obj.name, obj.get_date_range_display(),
+                                     money_filter(p, self.instance.order.event.currency))
 
 
 class OtherOperationsForm(forms.Form):
@@ -120,6 +121,7 @@ class OrderPositionAddForm(forms.Form):
     price = forms.DecimalField(
         required=False,
         max_digits=10, decimal_places=2,
+        localize=True,
         label=_('Gross price'),
         help_text=_("Including taxes, if any. Keep empty for the product's default price")
     )
@@ -149,10 +151,10 @@ class OrderPositionAddForm(forms.Form):
                 for v in variations:
                     p = get_price(i, v, invoice_address=ia)
                     choices.append(('%d-%d' % (i.pk, v.pk),
-                                    '%s – %s (%s %s)' % (pname, v.value, p, order.event.currency)))
+                                    '%s – %s (%s)' % (pname, v.value, p.print(order.event.currency))))
             else:
                 p = get_price(i, invoice_address=ia)
-                choices.append((str(i.pk), '%s (%s %s)' % (pname, p, order.event.currency)))
+                choices.append((str(i.pk), '%s (%s)' % (pname, p.print(order.event.currency))))
         self.fields['itemvar'].choices = choices
         if ItemAddOn.objects.filter(base_item__event=order.event).exists():
             self.fields['addon_to'].queryset = order.positions.filter(addon_to__isnull=True).select_related(
@@ -165,6 +167,7 @@ class OrderPositionAddForm(forms.Form):
             self.fields['subevent'].queryset = order.event.subevents.all()
         else:
             del self.fields['subevent']
+        change_decimal_field(self.fields['price'], order.event.currency)
 
 
 class OrderPositionChangeForm(forms.Form):
@@ -178,6 +181,7 @@ class OrderPositionChangeForm(forms.Form):
     price = forms.DecimalField(
         required=False,
         max_digits=10, decimal_places=2,
+        localize=True,
         label=_('New price (gross)')
     )
     operation = forms.ChoiceField(
@@ -236,14 +240,13 @@ class OrderPositionChangeForm(forms.Form):
                     p = get_price(i, v, voucher=instance.voucher, subevent=instance.subevent,
                                   invoice_address=ia)
                     choices.append(('%d-%d' % (i.pk, v.pk),
-                                    '%s – %s (%s %s)' % (pname, v.value, localize(p),
-                                                         instance.order.event.currency)))
+                                    '%s – %s (%s)' % (pname, v.value, p.print(instance.order.event.currency))))
             else:
                 p = get_price(i, None, voucher=instance.voucher, subevent=instance.subevent,
                               invoice_address=ia)
-                choices.append((str(i.pk), '%s (%s %s)' % (pname, localize(p),
-                                                           instance.order.event.currency)))
+                choices.append((str(i.pk), '%s (%s)' % (pname, p.print(instance.order.event.currency))))
         self.fields['itemvar'].choices = choices
+        change_decimal_field(self.fields['price'], instance.order.event.currency)
 
     def clean(self):
         if self.cleaned_data.get('operation') == 'price' and not self.cleaned_data.get('price', '') != '':