newforms-admin: Added link to current file for file-based widgets in the admin

git-svn-id: http://code.djangoproject.com/svn/django/branches/newforms-admin@6457 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/options.py

@@ -164,6 +164,11 @@ class BaseModelAdmin(object):
             kwargs['widget'] = widgets.AdminTimeWidget
             return db_field.formfield(**kwargs)
 
+        # For FileFields and ImageFields add a link to the current file.
+        if isinstance(db_field, models.ImageField) or isinstance(db_field, models.FileField):
+            kwargs['widget'] = widgets.AdminFileWidget
+            return db_field.formfield(**kwargs)
+
         # For ForeignKey or ManyToManyFields, use a special widget.
         if isinstance(db_field, (models.ForeignKey, models.ManyToManyField)):
             if isinstance(db_field, models.ForeignKey) and db_field.name in self.raw_id_fields:

django/contrib/admin/widgets.py

@@ -60,6 +60,21 @@ class AdminSplitDateTime(forms.SplitDateTimeWidget):
         return u'<p class="datetime">%s %s<br />%s %s</p>' % \
             (_('Date:'), rendered_widgets[0], _('Time:'), rendered_widgets[1])
 
+class AdminFileWidget(forms.FileInput):
+    """
+    A FileField Widget that shows it's current value if it has one
+    """
+    def __init__(self, attrs={}):
+        super(AdminFileWidget, self).__init__(attrs)
+        
+    def render(self, name, value, attrs=None):
+        from django.conf import settings
+        output = []
+        if value:
+            output.append('Currently: <a target="_blank" href="%s%s">%s</a> <br>Change: ' % (settings.MEDIA_URL, value, value))
+        output.append(super(AdminFileWidget, self).render(name, value, attrs))
+        return u''.join(output)
+
 class ForeignKeyRawIdWidget(forms.TextInput):
     """
     A Widget for displaying ForeignKeys in the "raw_id" interface rather than

django/http/__init__.py

@@ -48,6 +48,8 @@ class HttpRequest(object):
         "Returns the HTTP host using the environment or request headers."
         # We try three options, in order of decreasing preference.
         host = self.META.get('HTTP_X_FORWARDED_HOST', '')
+        if host: 
+            return host
         if 'HTTP_HOST' in self.META:
             host = self.META['HTTP_HOST']
         else: