fix compilation warning about ASN.1

mix.exs

@@ -24,10 +24,47 @@ defmodule Floof.MixProject do
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [
-      {:asn1ex, git: "https://github.com/vicentfg/asn1ex"},
       {:enacl, "~> 1.0.0"}
       # {:dep_from_hexpm, "~> 0.3.0"},
       # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
     ]
   end
 end
+
+# source: https://github.com/processone/ejabberd/blob/441eca75b23ecc3fd2ae35655d23061fb28cdefa/mix.exs
+defmodule Mix.Tasks.Compile.Asn1 do
+  use Mix.Task
+  alias Mix.Compilers.Erlang
+
+  @recursive true
+  @manifest ".compile.asn1"
+
+  def run(args) do
+    {opts, _, _} = OptionParser.parse(args, switches: [force: :boolean])
+
+    project      = Mix.Project.config
+    source_paths = project[:asn1_paths] || ["asn1"]
+    dest_paths    = project[:asn1_target] || ["src"]
+    mappings     = Enum.zip(source_paths, dest_paths)
+    options      = project[:asn1_options] || []
+
+    force = case opts[:force] do
+        :true -> [force: true]
+        _ -> [force: false]
+    end
+
+    Erlang.compile(manifest(), mappings, :asn1, :erl, force, fn
+      input, output ->
+        options = options ++ [:noobj, outdir: Erlang.to_erl_file(Path.dirname(output))]
+        case :asn1ct.compile(Erlang.to_erl_file(input), options) do
+          :ok -> {:ok, :done}
+          error -> error
+        end
+    end)
+  end
+
+  def manifests, do: [manifest()]
+  defp manifest, do: Path.join(Mix.Project.manifest_path, @manifest)
+
+  def clean, do: Erlang.clean(manifest())
+end

mix.lock

@@ -1,4 +1,3 @@
 %{
-  "asn1ex": {:git, "https://github.com/vicentfg/asn1ex", "0255348e2fffbdfd1eef7b46f71dc733318a36a0", []},
   "enacl": {:hex, :enacl, "1.0.0", "1bacae6c8aad1a2944ed5eb108e241d0d5e466819b685dfa690650abdff9bba0", [:rebar3], [], "hexpm", "308b38a8cb0d244c97d06b8da73abc318d73f576ab1e7c4999eaf0bbcf993bd2"},
 }