1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
from django.template import TemplateDoesNotExist
from django.template.loader import get_template
_cached_name_lookups = {}
def select_template_name(template_name_list, using=None):
"""
Given a list of template names, find the first one that exists.
"""
if not isinstance(template_name_list, tuple):
template_name_list = tuple(template_name_list)
try:
return _cached_name_lookups[template_name_list]
except KeyError:
# Find which template of the template_names is selected by the Django loader.
for template_name in template_name_list:
try:
get_template(template_name, using=using)
except TemplateDoesNotExist:
continue
else:
template_name = str(template_name) # consistent value for lazy() function.
_cached_name_lookups[template_name_list] = template_name
return template_name
return None
|
