added readline support

[A-UNDERSCORE-D]

This adds readline support, meaning that among other things, your lines don't get cut up if you're typing and a new raw line comes in, arrow keys can be used to edit lines, and history is kept

[DanielOaks]

Awesome, nice change. So I'm gonna do some work on top of this and ensure that we preserve Windows compat, maybe make this functionality configurable, and will definitely merge it in!

[jesopo]

bump xoxox

[slingamn]

https://github.com/chzyer/readline looks abandoned. rlwrap(1) has been working OK for me, e.g.:

rlwrap ircdog --tls testnet.ergo.chat 6697

[DanielOaks]

I think the main trouble I was having with this pr was just keeping windows+ansi compatibility is hard – if there's a solution/lib/etc that can provide this functionality while keeping those (at the same time, ie ansi on windows) working then I'm happy!

[slingamn]

I took another look at this using github.com/chzyer/readline v1.5.1. I'm having some weird issues with the library. defer rl.Close() gets stuck here:

https://github.com/chzyer/readline/blob/7f93d88cd5ffa0e805d58d2f9fc3191be15ec668/terminal.go#L228

until the user presses the enter key. This stops the app from exiting in response to a server-side disconnection (e.g. one caused by the QUIT command).

I could try putting together a minimal test case for this and showing it to upstream...

[slingamn]

Not calling rl.Close() is not a viable workaround: if it isn't called, (for example, if os.Exit() or log.Fatalf terminates the program), it leaves the terminal in a broken state.

[slingamn]

chzyer/readline#217

[A-UNDERSCORE-D]

Was generally behaving when I created this pr, however I haven't touched this in quite a while

[slingamn]

Sorry, I got lazy and was using this as the tracking issue for readline. I opened a real tracking issue at #28