defmodule Mix.Tasks.Semver do
  @moduledoc """
  The semver mix task: `mix semver`
  """
  use Mix.Task

  @semver_line_rx ~r/version: "(\d+)\.(\d+)\.(\d+)(-.*)?",/

  @shortdoc "Default task will report the semantic version."
  def run(_) do
    {:ok, data} = File.read("mix.exs")
    [semver_line | _] = Regex.run(@semver_line_rx, data)

    semver =
      semver_line
      |> String.replace("version: ", "")
      |> String.replace("\"", "")
      |> String.replace(",", "")
      |> Version.parse!()

    IO.puts("Current Version: #{semver}")
    :ok
  end
end