Svg helper to reference icons

svg_helper.rb

  def svg_icon(icon, view_box: nil, css_class: "")
    view_box = view_box.join(" ") if view_box # no need by default, because we use symbols with viewBox
    element_id = "icon-#{icon}"
    css_class << " icon "
    css_class << element_id

    content_tag :svg, class: css_class, viewBox: view_box do
      content_tag :use, nil, :"xlink:href" => "##{element_id}"
    end
  end

# OR

  def svg_icon(icon, view_box: [0,0,32,32], css_class: nil)
    view_box = view_box.join(" ")

    %Q{<svg class="icon icon-#{icon} #{css_class}" viewBox="#{view_box}"><use xlink:href="#icon-#{icon}"></use></svg>}.html_safe
  end