call
Call an Erlang function.
The {% call %} tag is used to call the render/3 function of the module specified by the argument.
For example:
{% call mymodule a=1 b=2 %}
Will call mymodule:render([{a,1}],[{b,2}], TemplateVariables, Context). Where TemplateVariables is the map
with all template variables and Context is the current Zotonic request context.
The render/2 function must return either {ok, IoList} or {error, Reason}.
If {error, Reason} is returned then the Reason is rendered as io_lib:format("~p", [Reason])
For compatibility with Django it is possible to pass a single value instead an argument list:
{% call mymodule with value %}
This will call mymodule:render(Value, TemplateVariables, Context).