Phoenix.Template.Engine behaviour
Engines need only to support precompiling a template function, of the form:
def precompile(file_path, template_name)
The precompile/2 function must return an AST for for a render/2 function:
def render(template_name, assigns \ [])
See Template.EExEngine for an example engine implementation.
Template Engine Configuration
By default, eex and haml are supported (with an optional Calliope dep)
To Configure a third-party Phoenix Template Engine, simply add the
extenion and module to your Mix Config, ie:
config :phoenix, :template_engines,
slim: Slim.PhoenixEngine