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Optimized nested navigation rendering: don't cross template boundary (#2213)
The number of calls to sub-templates when rendering the navigation is O(n^2) relative to the number of pages. This is the only such instance, which is why I think this is worth optimizing. The optimization here doesn't improve the complexity, it just removes the overhead of instantiating a new Jinja template for each of these calls. E.g. for 710 pages on the site, the number of calls to Jinja's `get_template` (implying `new_context` and others) crosses a million ==(710**2)*2. They're not expensive but also not super cheap, and add up to a big percentage of overall site build times.
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@ -2,6 +2,7 @@
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This file was automatically generated - do not edit
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-#}
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{% set features = config.theme.features or [] %}
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{% macro do_nav_item(nav_item, path, level) %}
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{% set class = "md-nav__item" %}
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{% if nav_item.active %}
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{% set class = class ~ " md-nav__item--active" %}
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@ -31,9 +32,7 @@
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<ul class="md-nav__list" data-md-scrollfix>
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{% set base = path %}
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{% for nav_item in nav_item.children %}
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{% set path = base ~ "-" ~ loop.index %}
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{% set level = level + 1 %}
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{% include "partials/nav-item.html" %}
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{{ do_nav_item(nav_item, path = base ~ "-" ~ loop.index, level = level + 1) }}
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{% endfor %}
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</ul>
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</nav>
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@ -65,3 +64,5 @@
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</a>
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</li>
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{% endif %}
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{% endmacro %}
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{{ do_nav_item(nav_item, path, level) }}
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@ -23,6 +23,9 @@
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<!-- Retrieve features from configuration -->
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{% set features = config.theme.features or [] %}
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<!-- Wrap everything into a macro to reduce file roundtrips -->
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{% macro do_nav_item(nav_item, path, level) %}
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<!-- Determine class according to state -->
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{% set class = "md-nav__item" %}
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{% if nav_item.active %}
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@ -82,9 +85,7 @@
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<!-- Render nested item list -->
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{% set base = path %}
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{% for nav_item in nav_item.children %}
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{% set path = base ~ "-" ~ loop.index %}
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{% set level = level + 1 %}
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{% include "partials/nav-item.html" %}
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{{ do_nav_item(nav_item, path = base ~ "-" ~ loop.index, level = level + 1) }}
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{% endfor %}
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</ul>
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</nav>
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@ -136,3 +137,7 @@
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</a>
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</li>
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{% endif %}
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{% endmacro %}
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{{ do_nav_item(nav_item, path, level) }}
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