Support for specifying currency symbol and frac_digits directly

cartridge/shop/fields.py

@@ -6,12 +6,10 @@
 from __future__ import unicode_literals
 from future.builtins import super
 
-from locale import localeconv
-
 from django.db.models import CharField, DecimalField
 from django.utils.translation import ugettext_lazy as _
 
-from cartridge.shop.utils import set_locale
+from cartridge.shop.utils import get_frac_digits
 
 
 class OptionField(CharField):
@@ -43,9 +41,9 @@ class MoneyField(DecimalField):
     precision.
     """
     def __init__(self, *args, **kwargs):
-        set_locale()
+        frac_digits = get_frac_digits()
         defaults = {"null": True, "blank": True, "max_digits": 10,
-                    "decimal_places": localeconv()["frac_digits"]}
+                    "decimal_places": frac_digits}
         defaults.update(kwargs)
         super(MoneyField, self).__init__(*args, **defaults)
 

cartridge/shop/forms.py

@@ -6,7 +6,6 @@
 from copy import copy
 from datetime import date
 from itertools import dropwhile, takewhile
-from locale import localeconv
 from re import match
 
 from django import forms
@@ -23,7 +22,7 @@
 from cartridge.shop import checkout
 from cartridge.shop.models import Product, ProductOption, ProductVariation
 from cartridge.shop.models import Cart, CartItem, Order, DiscountCode
-from cartridge.shop.utils import (make_choices, set_locale, set_shipping,
+from cartridge.shop.utils import (make_choices, get_frac_digits, set_shipping,
                                   clear_session)
 
 
@@ -451,8 +450,8 @@ def render(self, name, value, attrs):
         except (TypeError, ValueError):
             pass
         else:
-            set_locale()
-            value = ("%%.%sf" % localeconv()["frac_digits"]) % value
+            frac_digits = get_frac_digits()
+            value = ("%%.%sf" % frac_digits) % value
             attrs["style"] = "text-align:right;"
         return super(MoneyWidget, self).render(name, value, attrs)
 

cartridge/shop/templatetags/shop_tags.py

@@ -1,6 +1,6 @@
 
 from __future__ import unicode_literals
-from future.builtins import str
+from future.builtins import str, chr
 
 from decimal import Decimal
 import locale
@@ -10,6 +10,7 @@
 
 from cartridge.shop.utils import set_locale
 
+from mezzanine.conf import settings
 
 register = template.Library()
 
@@ -19,10 +20,45 @@ def currency(value):
     """
     Format a value as currency according to locale.
     """
-    set_locale()
+    try:
+        set_locale()
+    except:
+        pass
     if not value:
         value = 0
-    if hasattr(locale, "currency"):
+    # if SHOP_CURRENCY_SYMBOL and SHOP_CURRENCY_FRAC_DIGITS are defined,
+    # they take precedence.
+    # SHOP_CURRENCY_SYMBOL can be an ASCII string like
+    # SHOP_CURRENCY_SYMBOL = "$",
+    # or it can be a number that represents a currency, like
+    # SHOP_CURRENCY_SYMBOL = 163
+    # where 163 is the ASCII code for the British Pound currency symbol.
+    if hasattr(settings, "SHOP_CURRENCY_SYMBOL") and \
+        hasattr(settings, "SHOP_CURRENCY_FRAC_DIGITS"):
+        frac_digits = settings.SHOP_CURRENCY_FRAC_DIGITS
+        try:
+            currency_symbol = chr(settings.SHOP_CURRENCY_SYMBOL)
+        except:
+            currency_symbol = settings.SHOP_CURRENCY_SYMBOL
+        if hasattr(settings, "SHOP_CURRENCY_SEP_BY_SPACE"):
+            p_sep_by_space = settings.SHOP_CURRENCY_SEP_BY_SPACE
+        else:
+            p_sep_by_space = False
+        if hasattr(settings, "SHOP_CURRENCY_MON_DECIMAL_POINT"):
+            mon_decimal_point = settings.SHOP_CURRENCY_MON_DECIMAL_POINT
+        else:
+            mon_decimal_point = "."
+        if hasattr(settings, "SHOP_CURRENCY_P_CS_PRECEDES"):
+            p_cs_precedes = settings.SHOP_CURRENCY_P_CS_PRECEDES
+        else:
+            p_cs_precedes = True
+
+        value = [currency_symbol, p_sep_by_space and " " or "",
+            (("%%.%sf" % frac_digits) % value).replace(".", mon_decimal_point)]
+        if not p_cs_precedes:
+            value.reverse()
+        value = "".join(value)
+    elif hasattr(locale, "currency"):
         value = locale.currency(Decimal(value), grouping=True)
         if platform.system() == 'Windows':
             try:

cartridge/shop/utils.py

@@ -2,7 +2,7 @@
 from future.builtins import bytes, zip, str as _str
 
 import hmac
-from locale import setlocale, LC_MONETARY
+from locale import setlocale, LC_MONETARY, localeconv
 try:
     from hashlib import sha512 as digest
 except ImportError:
@@ -144,3 +144,12 @@ def set_locale():
                 "configure the SHOP_CURRENCY_LOCALE setting in your settings "
                 "module.")
         raise ImproperlyConfigured(msg % currency_locale)
+
+
+def get_frac_digits():
+    if hasattr(settings, "SHOP_CURRENCY_FRAC_DIGITS"):
+        frac_digits = settings.SHOP_CURRENCY_FRAC_DIGITS
+    else:
+        set_locale()
+        frac_digits = localeconv()["frac_digits"]
+    return frac_digits