neiam /gitgud

defmodule Mix.Tasks.Gitgud.Ssh.AuthorizedKeys do
  @shortdoc "Regenerate the authorized_keys file from registered SSH keys."

  @moduledoc """
  Writes `~git/.ssh/authorized_keys` (or a path you pass on the
  command line) with one `command="gitgud-ssh <id>" …` entry per
  registered SSH key.

      mix gitgud.ssh.authorized_keys                 # prints to stdout
      mix gitgud.ssh.authorized_keys /path/to/file   # writes file
  """

  use Mix.Task

  @impl Mix.Task
  def run(argv) do
    Mix.Task.run("app.start")
    contents = GitGud.SshKeys.authorized_keys()

    case argv do
      [] ->
        IO.write(contents)

      [path | _] ->
        File.mkdir_p!(Path.dirname(path))
        File.write!(path, contents)
        File.chmod!(path, 0o600)
        IO.puts("wrote #{byte_size(contents)} bytes to #{path}")
    end
  end
end