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nerves_bootstrap

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Nerves mix integration bootstrap and new project generator

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nerves_bootstrap lib mix nerves shell.ex
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lib/mix/nerves/shell.ex 

defmodule Mix.Nerves.Shell do



  def open(command, initial_input \\ []) do

    # We need to get raw binary access to the stdout file descriptor

    # so we can directly pass through control characters output by the command

    stdout_port = Port.open({:fd, 0, 1}, [:binary, :eof, :stream, :out])



    # We use the tty_sl driver for input because it handles tty geometry and

    # streaming mode.

    stdin_port = Port.open({:spawn, "tty_sl -c -e"}, [:binary, :eof, :stream, :in])



    # We run the command through the script command to emulate a pty

    cmd_port = Port.open({:spawn, "script -q /dev/null #{command}"}, [:binary, :eof, :stream, :stderr_to_stdout])



    # Tell the script command about the terminal dimensions

    {w, h} = get_tty_geometry(stdin_port)

    Port.command(cmd_port,

    """

    stty sane rows #{h} cols #{w}; stty -echo

    export PS1=""; export PS2=""

    start() {

    echo -e "\\e[17F\\e[0J\\e[1;7m\n  Preparing Nerves Shell  \\e[0m"

    echo -e "\\e]0;Nerves Shell\\a"

    export PS1="\\[\\e[1;7m\\] Nerves \\[\\e[0;1m\\] \\w > \\[\\e[0m\\]"

    export PS2="\\[\\e[1;7m\\] Nerves \\[\\e[0;1m\\] \\w ..\\[\\e[0m\\]"

    #{Enum.join(initial_input, "\n")}

    stty echo

    }; start

    """)



    shell_loop(stdin_port, stdout_port, cmd_port)

  end



  defp shell_loop(stdin_port, stdout_port, cmd_port) do

    receive do

      # Route input from stdin to the command port

      {^stdin_port, {:data, data}} ->

        Port.command(cmd_port, data)

        shell_loop(stdin_port, stdout_port, cmd_port)



      # Route output from the command port to stdout

      {^cmd_port, {:data, data}} ->

        Port.command(stdout_port, data)

        shell_loop(stdin_port, stdout_port, cmd_port)



      # If any of the ports get closed, break out of the loop

      {_port, :eof} ->

        :ok



      # Ignore other messages

      _message ->

        shell_loop(stdin_port, stdout_port, cmd_port)

    end

  end



  @ctrl_op_get_winsize 100



  defp get_tty_geometry(tty_port) do

    geometry = :erlang.port_control(tty_port, @ctrl_op_get_winsize, [])

    |> :erlang.list_to_binary()

    <<w::native-integer-size(32), h::native-integer-size(32)>> = geometry

    {w, h}

  end



end