Pregenerate the icons with a mix task

lib/mix/heroicons/svg_processor.ex

@@ -0,0 +1,20 @@
+defmodule Mix.Heroicons.SvgProcessor do
+  alias Mix.Heroicons.SvgProcessor.Handler
+
+  @moduledoc """
+  An SVG parser loosly based on https://github.com/svg/svgo
+
+  ## Options
+
+  Currently supports the following options:
+  * `:remove_dimensions` - remove the `width` and `height` attributes. Defaults to false.
+  * `:sort_attributes` - sort the svg attributes by name. Default to false.
+  * `:remove_attributes` - list of attributes to remove
+  * `:add_attributes` - list of `{"name", "value"}` pairs of attributes to add
+  """
+
+  def process(svg, opts \\ []) do
+    {:ok, stack} = Saxy.parse_string(svg, Handler, {[], opts})
+    Saxy.encode!(stack)
+  end
+end