Document ctrl+d to exit REPL

[pfiaux]

Describe the bug
I couldn't get out out of the REPL after running bass 🙈, I usually ended up closing that terminal session and letting my shell handle it. I tried all sorts of things I'm used to:

• ctrl+c
• exit (exit) (exit 1)
• quit
• system.exit, process.exit, ...
• (error)

Eventually I was looking up how to get out of a LISP REPL and found https://stackoverflow.com/a/4982226/891965.

To Reproduce
n/a

Expected behavior
I felt I was missing 2 things:

• Some part of the docs or getting started mentioning how to close/exit the REPL
• Some hint when running exit commands common to other environments (exit or ctrl+c) that to exit one should use ctrl+d

For example the python3 REPL does this:

⟩ python3
>>> exit
Use exit() or Ctrl-D (i.e. EOF) to exit

I realize this might not be a common problem, if you disagree we can close this 👍. Searching for exit or REPL in the issues will turn this up if someone else gets stuck where I did it would already help.

Additional context
There's probably some language background to this, probably this is obvious to those who use some tools or some languages. I mostly do go, nodejs, bash, fishshell but ctrl+d wasn't something I thought of.

[vito]

Yeah, this is something I take for granted. :) Happy to make this more ergonomic.

Traditionally Ctrl+C doesn't exit out of a REPL because it's also used to bail out of the current input and start over. Maybe we could detect when Ctrl+C is pressed with an empty input and print a helpful message.

Or maybe bass could just print some useful things on start?

⟩ bass
Playing Bass v0.10.0.
Use (doc foo) to print the docs for foo. Use Ctrl+D to exit.
=> 

Not really wedded to a particular solution, but this is definitely valid. More ideas welcome.

[pfiaux]

Print on start would work, happy to work on a PR after I finish the one I already started.