defmodule Unit.ComptimeUtils do
    @moduledoc false
    # This module is useful to control some aspects of compilation.
  
    # Only works for Linux targets today, but we don't need more.
    @doc false
    def cpu_with_all_caps?(needed_flags, opts \\ []) do
      opts = Keyword.validate!(opts, cpu_info_file_path: "/proc/cpuinfo", target: nil)
  
      case File.read(opts[:cpu_info_file_path]) do
        {:ok, contents} ->
          flags =
            contents
            |> String.split("\n")
            |> Stream.filter(&String.starts_with?(&1, "flags"))
            |> Stream.map(fn line ->
              [_, flags] = String.split(line, ": ")
              String.split(flags)
            end)
            |> Stream.uniq()
            |> Enum.to_list()
            |> List.flatten()
  
          Enum.all?(needed_flags, fn flag -> flag in flags end)
  
        {:error, _} ->
          # There is no way to say, so we default to false.
          false
      end
    end
  end