jinja2: add decorator for adding custom filters

pywb/core/views.py

@@ -10,6 +10,50 @@ from itertools import imap
 from jinja2 import Environment, FileSystemLoader, PackageLoader
 
 
+FILTERS = {}
+
+
+#=================================================================
+class template_filter(object):
+    """
+    Decorator for registering a function as a jinja2 filter
+    If optional argument is supplied, it is used as the filter name
+    Otherwise, the func name is the filter name
+    """
+    def __init__(self, param=None):
+        if hasattr(param, '__call__'):
+            self.name = None
+            self.__call__(param)
+        else:
+            self.name = param
+
+    def __call__(self, func):
+        name = self.name
+        if not name:
+            name = func.__name__
+
+        FILTERS[name] = func
+        return func
+
+
+#=================================================================
+# Filters
+@template_filter
+def format_ts(value, format_='%a, %b %d %Y %H:%M:%S'):
+    value = timestamp_to_datetime(value)
+    return value.strftime(format_)
+
+
+@template_filter('host')
+def get_hostname(url):
+    return urlparse.urlsplit(url).netloc
+
+
+@template_filter()
+def request_hostname(env):
+    return env.get('HTTP_HOST', 'localhost')
+
+
 #=================================================================
 class J2TemplateView:
     def __init__(self, filename):
@@ -26,9 +70,7 @@ class J2TemplateView:
             loader = PackageLoader('pywb', template_dir)
 
         jinja_env = Environment(loader=loader, trim_blocks=True)
-        jinja_env.filters['format_ts'] = J2TemplateView.format_ts
-        jinja_env.filters['host'] = J2TemplateView.get_host
-        jinja_env.filters['request_hostname'] = J2TemplateView.request_hostname
+        jinja_env.filters.update(FILTERS)
         return jinja_env
 
     def render_to_string(self, **kwargs):
@@ -46,20 +88,6 @@ class J2TemplateView:
                                         status=status,
                                         content_type=content_type)
 
-    # Filters
-    @staticmethod
-    def format_ts(value, format_='%a, %b %d %Y %H:%M:%S'):
-        value = timestamp_to_datetime(value)
-        return value.strftime(format_)
-
-    @staticmethod
-    def get_host(url):
-        return urlparse.urlsplit(url).netloc
-
-    @staticmethod
-    def request_hostname(env):
-        return env.get('HTTP_HOST', 'localhost')
-
 
 #=================================================================
 def load_template_file(file, desc=None, view_class=J2TemplateView):
@@ -83,6 +111,7 @@ class J2HtmlCapturesView(J2TemplateView):
         return J2TemplateView.render_response(self,
                                     cdx_lines=list(cdx_lines),
                                     url=wbrequest.wb_url.url,
+                                    type=wbrequest.wb_url.type,
                                     prefix=wbrequest.wb_prefix)