Timber embed SVG Plugin for WordPress

functions.php

/**
 * embed SVG
 * Example: <span>{{ "logo"|svg }}</span>
 *
 * @param \Twig\Environment $twig The Twig environment.
 * @return \Twig\Environment
 */
function twig_svg_embed($twig)
{
    $twig->addFilter(
        new Timber\Twig_Filter("svg", function ($name) {
            return file_get_contents(
                "wp-content/themes/{themename}/icon/" .
                    $name .
                    ".svg"
            );
        })
    );
    return $twig;
}
add_filter("timber/twig", "twig_svg_embed");