defmodule Mix.Tasks.GhDocs do
  @moduledoc """
  Task that pushes docs to gh-pages branch on Discord. 
  """

  use Mix.Task

  @remote_push_url "https://github.com/Kraigie/nostrum"

  defp run!(command) do
    if Mix.shell.cmd(command) != 0 do
      raise Mix.Error, message: "command `#{command}` failed"
    end
    :ok
  end

  # Taken from https://gist.github.com/jjh42/5737777 with some modifications
  @shortdoc "Mix task to publish gh-pages site."
  def run(_) do
    File.rm_rf "doc"
    Mix.Task.run "docs"
    File.cd! "doc"
    run! "git init ."
    run! "git add ."
    run! "git commit -a -m \"Generated docs\""
    run! "git remote add origin #{@remote_push_url}"
    run! "git push origin master:gh-pages --force"
  end
end