# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Utils do
  def compile_dir(dir) when is_binary(dir) do
    dir
    |> File.ls!()
    |> Enum.map(&Path.join(dir, &1))
    |> Kernel.ParallelCompiler.compile()
  end

  @doc """
  POSIX-compliant check if command is available in the system

  ## Examples
      iex> command_available?("git")
      true
      iex> command_available?("wrongcmd")
      false

  """
  @spec command_available?(String.t()) :: boolean()
  def command_available?(command) do
    match?({_output, 0}, System.cmd("sh", ["-c", "command -v #{command}"]))
  end

  @doc "creates the uniq temporary directory"
  @spec tmp_dir(String.t()) :: {:ok, String.t()} | {:error, :file.posix()}
  def tmp_dir(prefix \\ "") do
    sub_dir =
      [
        prefix,
        Timex.to_unix(Timex.now()),
        :os.getpid(),
        String.downcase(Integer.to_string(:rand.uniform(0x100000000), 36))
      ]
      |> Enum.join("-")

    tmp_dir = Path.join(System.tmp_dir!(), sub_dir)

    case File.mkdir(tmp_dir) do
      :ok -> {:ok, tmp_dir}
      error -> error
    end
  end
end