Moved to separate repository

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+rust2ex-*.tar
+
+
+# Temporary files for e.g. tests
+/tmp

README.md

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+# Rust2ex
+Compiles Rust packages in `native`, installs to `_build`.
+
+## Uses
+Particularly suited for Elixir-Rust ports.
+
+## Installation
+```elixir
+  def project do
+    [
+      compilers: [:rust2ex] ++ Mix.compilers,
+    ]
+  end
+```
+
+Run `mix compile` then `mix compile.rust2ex`.

lib/rust2ex.ex

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+defmodule Mix.Tasks.Compile.Rust2ex do
+  use Mix.Task
+  @moduledoc "Compiles Rust packages in `native`, installs to `_build`"
+
+  defp compile_dep(where) do
+    IO.puts(where)
+    {_, code} = System.cmd("cargo", ["build", "--manifest-path", where])
+
+    case code do
+      0 ->
+        System.cmd("cargo", [
+          "install",
+          "--path",
+          Path.dirname(where),
+          "--root",
+          Path.join(["_build", to_string(Mix.env()), "native"]),
+          if(Mix.env() == :prod, do: "", else: "--debug")
+        ])
+
+        :ok
+
+      fail ->
+        {:error, fail}
+    end
+  end
+
+  @spec run(any) :: :error | :ok
+  def run(_args) do
+    IO.puts("Running rust2ex")
+    oks = Path.wildcard(Path.join(["native", "*", "Cargo.toml"])) |> Enum.map(&compile_dep/1)
+
+    cond do
+      oks |> Enum.all?(fn x -> x == :ok end) ->
+        IO.puts(["Rust2ex completed with", length(oks), "Rust packages"] |> Enum.join(" "))
+        :ok
+
+      true ->
+        :error
+    end
+  end
+end

mix.exs

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+defmodule Rust2ex.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :rust2ex,
+      version: "0.1.0",
+      build_path: "../../_build",
+      config_path: "../../config/config.exs",
+      deps_path: "../../deps",
+      lockfile: "../../mix.lock",
+      elixir: "~> 1.11",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"},
+      # {:sibling_app_in_umbrella, in_umbrella: true}
+    ]
+  end
+end

test/rust2ex_test.exs

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+defmodule Rust2exTest do
+  use ExUnit.Case
+  doctest Rust2ex
+
+  test "greets the world" do
+    assert Rust2ex.hello() == :world
+  end
+end

test/test_helper.exs

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+ExUnit.start()