mixin emoji(id)
    -
        let classes = {
            'o-emoji': true,
            'o-emoji--zoomable': attributes.zoomable,
        }
        if (attributes.class) {
            classes[attributes.class] = true;
        }
        if (attributes.size) {
            classes['o-emoji--' + attributes.size] = true;
        }

        if (!attributes.unicode) {
            src = id + '.png'
        }

    if !attributes.unicode
        img(src=src, class=classes)
    else
        span(class=classes)= id