Pregenerate the icons with a mix task

lib/mix/heroicons/generator_helpers.ex

@@ -0,0 +1,19 @@
+defmodule Mix.Heroicons.GeneratorHelpers do
+  alias Mix.Heroicons.SvgProcessor
+
+  def icon_name(path) do
+    Path.basename(path, ".svg")
+    |> String.replace("-", "_")
+    |> String.to_atom()
+  end
+
+  def icon_body(path, svg_opts) do
+    icon =
+      File.read!(path)
+      |> SvgProcessor.process(svg_opts)
+
+    <<"<svg ", body::binary>> = icon
+
+    body
+  end
+end