mix_task_archive_deps

##
##
## Copyright (c) 2017, Daniil Fedotov.
## All Rights Reserved.
##
## Licensed under the Apache License, Version 2.0 (the "License");
## you may not use this file except in compliance with the License.
## You may obtain a copy of the License at
##
##     http://www.apache.org/licenses/LICENSE-2.0
##
## Unless required by applicable law or agreed to in writing, software
## distributed under the License is distributed on an "AS IS" BASIS,
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
## See the License for the specific language governing permissions and
## limitations under the License.
##
##

defmodule Mix.Tasks.Archive.Build.Deps do
  use Mix.Task

  @shortdoc "Archives the project dependencies into .ez files"

  @moduledoc """
  Builds each dependency into archives according to the specification of the
  [Erlang Archive Format](http://www.erlang.org/doc/man/code.html).

  Archives are prebuild packages, which can be used by both Erlang and Elixir
  without Mix or other dependency management tools.

  The archives will be created in the "archives" subdirectory of
  the project build directory by default, unless an argument `-o` is
  provided with the directory name.

  ## Command line options

  * `-o` - specifies output directory name.
      Defaults to BUILD_DIR/archives
  """

  @switches [destination: :string]
  @aliases [o: :destination]

  @spec run(OptionParser.argv) :: :ok
  def run(argv) do
    {opts, _} = OptionParser.parse!(argv, aliases: @aliases, strict: @switches)
    build_archives(opts)
  end

  def build_archives(opts) do
    build_path = Mix.Project.build_path
    destination = Mix.Archive.Build.Helpers.destination(opts)

    ## Build delendencies archives
    deps = Mix.Dep.loaded(env: Mix.env)
    Enum.each(deps, fn %Mix.Dep{app: app, status: status} ->
      version = case status do
        {:ok, vsn} when vsn != nil -> vsn
        reason -> :erlang.error({:invalid_status, reason})
      end
      archive_path = Path.join([destination, "#{app}-#{version}.ez"])
      app_dir = Path.join([build_path, "lib", "#{app}"])
      Mix.Tasks.Archive.Build.run(["-i", app_dir, "-o", archive_path])
    end)
    :ok
  end
end