Handle jinja2 renamed context decorators

Jinja2 v3.0 renamed contextfilter to pass_context. Put some code in that
handles both the v3 and v2 name at the same time, as a first step
towards supporting jinja2 v3.

postgresqleu/confreg/jinjafunc.py

@@ -26,6 +26,11 @@
 
 import jinja2
 import jinja2.sandbox
+try:
+    from jinja2 import pass_context
+except ImportError:
+    # Try Jinja2 2.x version
+    from jinja2 import contextfilter as pass_context
 import markdown
 
 
@@ -259,12 +264,12 @@ def _svgparagraph():
     return '<text x="{}" y="{}">{}</text>'.format(x, y, "\n".join(_svgparagraph()))
 
 
-@jinja2.contextfilter
+@pass_context
 def filter_applymacro(context, obj, macroname):
     return context.resolve(macroname)(obj)
 
 
-@jinja2.contextfilter
+@pass_context
 def filter_lookup(context, name, default=None):
     if not name:
         if default is not None:
@@ -285,7 +290,7 @@ def filter_lookup(context, name, default=None):
 
 # Unpack a social media link for the specific social media being rendered for.
 # This filter is *not* enabled by default.
-@jinja2.contextfilter
+@pass_context
 def filter_social(context, attr):
     if not context.get('messaging', None):
         return None
@@ -296,7 +301,7 @@ def filter_social(context, attr):
 # Get social media profiles including links from a structure.
 # Returns a list of (provider, handle, link) for each configured
 # social media identity.
-@jinja2.contextfilter
+@pass_context
 def filter_social_links(context, attr):
     if attr:
         for k, v in attr.items():

tools/deploystatic/deploystatic.py

@@ -20,6 +20,11 @@
 
 import jinja2
 import jinja2.sandbox
+try:
+    from jinja2 import pass_context
+except ImportError:
+    # Try Jinja2 2.x version
+    from jinja2 import contextfilter as pass_context
 
 import markdown
 
@@ -75,7 +80,7 @@ def filter_slugify(value):
 
 # Create social links. In the main site this is dynamic, this limited
 # implementation supports just twitter and mastodon.
-@jinja2.contextfilter
+@pass_context
 def filter_social_links(context, attr):
     if attr:
         for k, v in attr.items():