i18n sponsor fields

Feedback from PyConJP development

```
commit 5973e32ebdc231b209b5c058664e8b2b4a1dbc54
Author: MURAOKA Yusuke <yusuke@jbking.org>
Date:   Mon Mar 31 15:35:40 2014 +0900

    introduce Benefit.content_type which is used to display localized
    text
```

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

symposion/sponsorship/models.py

@@ -1,5 +1,6 @@
 import datetime
 
+from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import reverse
 from django.db import models
@@ -144,9 +145,17 @@ post_save.connect(_check_level_change, sender=Sponsor)
 
 BENEFIT_TYPE_CHOICES = [
     ("text", "Text"),
+    ("richtext", "Rich Text"),
     ("file", "File"),
     ("weblogo", "Web Logo"),
-    ("simple", "Simple")
+    ("simple", "Simple"),
+    ("option", "Option")
+]
+
+CONTENT_TYPE_CHOICES = [
+    ("simple", "Simple"),
+] + [
+    ("listing_text_%s" % lang, "Listing Text (%s)" % label) for lang, label in settings.LANGUAGES
 ]
 
 
@@ -154,8 +163,10 @@ class Benefit(models.Model):
 
     name = models.CharField(_("name"), max_length=100)
     description = models.TextField(_("description"), blank=True)
-    type = models.CharField(_("type"), choices=BENEFIT_TYPE_CHOICES, max_length=10,
-                            default="simple")
+    type = models.CharField(_("type"), choices=BENEFIT_TYPE_CHOICES,
+                            max_length=10, default="simple")
+    content_type = models.CharField(_("content type"), choices=CONTENT_TYPE_CHOICES,
+                                    max_length=20, default="simple")
 
     def __unicode__(self):
         return self.name

symposion/sponsorship/templatetags/sponsorship_tags.py

@@ -1,4 +1,5 @@
 from django import template
+from django.template.defaultfilters import linebreaks, urlize
 
 from symposion.conference.models import current_conference
 from symposion.sponsorship.models import Sponsor, SponsorLevel
@@ -75,3 +76,45 @@ def sponsor_levels(parser, token):
     {% sponsor_levels as levels %}
     """
     return SponsorLevelNode.handle_token(parser, token)
+
+
+class LocalizedTextNode(template.Node):
+
+    @classmethod
+    def handle_token(cls, parser, token):
+        bits = token.split_contents()
+        if len(bits) == 3:
+            return cls(bits[2], bits[1][1:-1])
+        elif len(bits) == 5 and bits[-2] == "as":
+            return cls(bits[2], bits[1][1:-1], bits[4])
+        else:
+            raise template.TemplateSyntaxError("%r takes 'as var'" % bits[0])
+
+    def __init__(self, sponsor, content_type, context_var=None):
+        self.sponsor_var = template.Variable(sponsor)
+        self.content_type = content_type
+        self.content_var = context_var
+
+    def render(self, context):
+        s = ''
+        try:
+            sponsor = self.sponsor_var.resolve(context)
+            content_type = '%s_%s' % (self.content_type, context['request'].LANGUAGE_CODE)
+            texts = sponsor.sponsor_benefits.filter(benefit__content_type=content_type)
+            if texts.count() > 0:
+                s = linebreaks(urlize(texts[0].text, autoescape=True))
+            if self.content_var:
+                context[self.content_var] = s
+                s = ''
+        except:
+            pass
+        return s
+
+
+@register.tag
+def localized_text(parser, token):
+    """
+    {% localized_text "content_type" sponsor %}
+    {% localized_text "content_type" sponsor as localized_text %}
+    """
+    return LocalizedTextNode.handle_token(parser, token)