{% macro header_links(links) -%}
{% for link in links %}
{% endfor %}
{%- endmacro %}
{% macro scripts(input_scripts) -%}
{% for script in input_scripts %}
{% endfor %}
{%- endmacro %}
{% macro complete_index_page(relative_head_links, relative_body_scripts,
central_head_links=None, central_body_scripts=None) -%}
Flame
{% if central_head_links %}
{# If there is a central sever, try to load resources from there to leverage browser caching #}
{{ header_links(central_head_links) }}
{# If the main app couldn't be loaded from the central server, load the relative files.
This involves recursively re-creating this entire index page with only the relative links/scripts #}
{% else %}
{# If no central server, exclusively serve the relative files (no fallback) #}
{# This can mean either the entire flame server has no central server from which to fetch the UI,
or it's the fallback page that is used when a browser fails to load resources from the central server. #}
{{ header_links(relative_head_links) }}
{% endif %}
{% if central_body_scripts %}
{{ scripts(central_body_scripts) }}
{% else %}
{{ scripts(relative_body_scripts) }}
{% endif %}
{%- endmacro %}
{# The top-level page can be either relative URLs only, or both relative & central
(i.e. central with fallback to relative) #}
{{ complete_index_page(relative_head_links, relative_body_scripts, central_head_links, central_body_scripts) }}