New task: bare-repl

[pesterhazy]

This PR adds a new bare-repl task to start a "bare" or terminal repl, as per clojure.main/repl.

A bare repl has a few advantages over the nREPL-based boot repl setup:

• fewer moving parts (no pods, no network connection)
• much faster startup
• direct access to tty, i.e. this works with boot repl -B but not with boot repl: (.readPassword (System/console) "Password: " (object-array []))

Like the normal repl task when not invoked with the -s option, boot bare-repl blocks the boot pipeline until the repl is closed with ^D.

Essentially the bare REPL is closer to what you get when following Clojure's Getting Started guide. Disadvantages of boot bare-repl compared to boot repl include:

• no pretty exceptions
• no readline support (but rlwrap boot repl -B works well)

[arichiardi]

Should we document the options? https://clojure.github.io/clojure/clojure.main-api.html#clojure.main/repl

[arichiardi]

Probably you have forgotten to pass the options here.

[alandipert]

This looks juicy but doesn't merge quickly, can you please give it a look when you have a chance? Thanks 🥇

[Deraen]

I wonder if this should be completely different task as the options probably differ heavily from nrepl options?

[alandipert]

That's a great point.

[pesterhazy]

Based on the feedback by @Deraen et al, I've rebased on master and extracted a standalone task, bare-repl. It accepts only the --init, --init-ns and --eval options. What do you think @alandipert?

[alandipert]

💯 - Can you please add to CHANGES.md for this one too?

[pesterhazy]

@alandipert done

[arichiardi]

Sorry if this come out it the blue but these has been a lot of discussion around repls in #unrepl lately and I was thinking that this task could be named socket only . The default is to use the accept function that launches the repl but then an option can specify a symbol containing any accept function. We would mimic Clojure's behavior and make thing way more extensible: we have pods, so we could transparently handle the one socket for repl/one or more sockets for tooling.

[pesterhazy]

@arichiardi, did you mean to comment on this (already merged) PR: #549? This PR is not about the socket server :)

[arichiardi]

Lol probably not 👍