[Proposal] persistent history for iex sessions

[Michał Gibowski]

Hi,

I come from Scala and I am used to that REPL history is persisted across sessions. So if I close console and open it again within the same project, I can still press arrow key on my keyboard and access commands from the previous session.

The same experience is supported by psql and probably many other tools.

I think it would be great to have this in iex too.

The history would be per project and could be stored in a file called for example .iex.history. I am not sure if it's necessary to place some any to it's size.

What do you think?

Cheers,

Michal Gibowski

[Marco Milanesi]

Hello,

Not sure if it can be used per project, however if you set the environment variable

ERL_AFLAGS=-kernel shell_history enabled

from your shell, you should have history.

Cheers

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[Adam Lancaster]

You can do this already 

https://til.hashrocket.com/posts/is9yfvhdnp-enable-history-in-iex-through-erlang-otp-20-

[Austin Ziegler]

You can also save this history to a file (but there’s no easy way to edit the history otherwise):

```

defmodule IexHistory do

  @moduledoc false

  def save_history(filename \\ "iex_history.exs") do

    File.write!(filename, Enum.reverse(:group_history.load()))

  end

end

```

-a

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