Move if/else logic for Django 1.8's Template Engine into compat

Created a few methods that will handle doing the if/else based on
what's been imported successfully. This cleans up the logic in the
toolbar itself.

debug_toolbar/compat.py

@@ -5,6 +5,7 @@
 debug_toolbar.
 """
 
+from django.conf import settings
 
 try:
     from django.core.cache import CacheHandler, caches
@@ -16,7 +17,7 @@
     from django.template.engine import Engine
 except ImportError:  # < Django 1.8
     Engine = None
-    from django.template.context import get_standard_processors  #NOQA
+    from django.template.context import get_standard_processors  # NOQA
     from django.template.loader import find_template_loader  # NOQA
 
 try:
@@ -45,3 +46,32 @@
 except ImportError:  # >= Django 1.7
     import weakref
     WEAKREF_TYPES = weakref.ReferenceType,
+
+
+def get_template_dirs():
+    """Compatibility method to fetch the template directories."""
+    if Engine:
+        template_dirs = Engine.get_default().dirs
+    else:  # < Django 1.8
+        template_dirs = settings.TEMPLATE_DIRS
+    return template_dirs
+
+
+def get_template_loaders():
+    """Compatibility method to fetch the template loaders."""
+    if Engine:
+        loaders = Engine.get_default().template_loaders
+    else:  # < Django 1.8
+        loaders = [
+            find_template_loader(loader_name)
+            for loader_name in settings.TEMPLATE_LOADERS]
+    return loaders
+
+
+def get_template_context_processors():
+    """Compatibility method to fetch the template context processors."""
+    if Engine:
+        context_processors = Engine.get_default().template_context_processors
+    else:  # < Django 1.8
+        context_processors = get_standard_processors()
+    return context_processors

debug_toolbar/panels/templates/panel.py

@@ -5,7 +5,6 @@
 
 import django
 from django import http
-from django.conf import settings
 from django.conf.urls import url
 from django.db.models.query import QuerySet, RawQuerySet
 from django.template import Context, RequestContext, Template
@@ -15,7 +14,8 @@
 from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 
-from debug_toolbar.compat import OrderedDict, Engine, get_standard_processors
+from debug_toolbar.compat import (
+    OrderedDict, get_template_dirs, get_template_context_processors)
 from debug_toolbar.panels import Panel
 from debug_toolbar.panels.sql.tracking import recording, SQLQueryTriggered
 from debug_toolbar.panels.templates import views
@@ -47,10 +47,7 @@ def _request_context__init__(
         processors = tuple(processors)
     self.context_processors = OrderedDict()
     updates = dict()
-    if Engine:
-        std_processors = Engine.get_default().template_context_processors
-    else:
-        std_processors = get_standard_processors()
+    std_processors = get_template_context_processors()
     for processor in std_processors + processors:
         name = '%s.%s' % (processor.__module__, processor.__name__)
         context = processor(request)
@@ -191,10 +188,7 @@ def process_response(self, request, response):
         else:
             context_processors = None
 
-        if Engine:
-            template_dirs = Engine.get_default().dirs
-        else:
-            template_dirs = settings.TEMPLATE_DIRS
+        template_dirs = get_template_dirs()
 
         self.record_stats({
             'templates': template_context,

debug_toolbar/panels/templates/views.py

@@ -1,12 +1,11 @@
 from __future__ import absolute_import, unicode_literals
 
 from django.http import HttpResponseBadRequest
-from django.conf import settings
 from django.shortcuts import render_to_response
 from django.template import TemplateDoesNotExist
 from django.utils.safestring import mark_safe
 
-from debug_toolbar.compat import Engine, find_template_loader
+from debug_toolbar.compat import get_template_loaders
 
 
 def template_source(request):
@@ -19,10 +18,7 @@ def template_source(request):
         return HttpResponseBadRequest('"template" key is required')
 
     final_loaders = []
-    if Engine:
-        loaders = Engine.get_default().template_loaders
-    else:
-        loaders = [find_template_loader(loader_name) for loader_name in settings.TEMPLATE_LOADERS]
+    loaders = get_template_loaders()
 
     for loader in loaders:
         if loader is not None: