1.ex

defmodule MyApp.Web.ComponentHelpers do
  def component(template, assigns) do
    MyApp.Web.ComponentView.render(template, assigns)
  end
  
  def component(template, assigns, do: block) do
    MyApp.Web.ComponentView.render(template, Keyword.merge(assigns, [do: block]))
  end
  
  def c(name, assigns) do
    component(template(name), assigns)
  end
  
  def c(name, assigns, opts) do
    component(template(name), assigns, opts)
  end
  
  defp template(name) when is_atom(name) do
    "#{name}.html"
  end
end

1.html.eex

<%= c :tabs do %>
  <%= c :tab, name: "All Products" %>
  <%= c :tab, name: "Featured" %>
<% end %>