Make REPL handle interrupt of running code without killing its process (like in Ammonite)

[bjornregnell]

It would be great if the REPL could interrupt running code without loosing the current session.

Currently on linux:

sbt> scalaVersion
[info] 3.0.0-RC2-bin-20210308-0dbe970-NIGHTLY
sbt> consoleQuick
scala> while true do ()
<<interrupted with SIGINT>> 
[warn] Canceling execution...
[warn] Run canceled.
Cancelled: consoleQuick
[error] Cancelled: consoleQuick
[error] Use 'last' for the full log.
sbt>

Ammonite solves this (perhaps through sun.misc.Signal:
https://ammonite.io/#Interruptingrun-awayexecutionwithCtrl-C

@ while(true) ()
... hangs ...
^Ctrl-C
Interrupted!

@

From Ammonite docs: "The traditional Scala REPL doesn't handle runaway code, and gives you no option but to kill the process, losing all your work. Ammonite-REPL lets you interrupt the thread, stop the runaway-command and keep going."

See also discussion here:
https://users.scala-lang.org/t/c-ctrl-c-closes-repl-expression-interpreter-interactive-loop/7187/8