Explain how to run a Scala 3 program compiled on the command line

[lrytz]

Cross-posting from gitter before I can't find my own message anymore.

https://www.scala-lang.org/download/scala3.html suggests cs install scala3-compiler and cs install scala3-repl to install, and scala3-compiler test.scala to compile something on the command line. But it doesn't say how to run the compiled program.

If I have @main def hello(): Unit = ..., then scala3-repl hello just opens the REPL. java -cp $(cs fetch -p scala3-repl):. hello works, is there anything simpler?

[lrytz]

Duplicate of scala/scala3#12811

[bjornregnell]

This is a showstopper for me to use cs in my teaching. And there is no .msi for Scala 3 so I'm more or less stuck (manually unpackaging a zip and going into environment variables to fiddle with path etc in Windows is not very attractive beginner programmer user experience...)

[bjornregnell]

See also scala/scala3#12502

[bjornregnell]

See also #1248

[bjornregnell]

@lrytz Is this really a duplicate of scala/scala3#12811?
A runner does not have to depend on cursier, and the download page should explain how to run a Scala 3 program IMHO.

[lrytz]

I closed this to avoid having too many tickets for the same underlying issue. I assume when the coursier issue (coursier/coursier#2058) gets fixed the website will be updated too. But I we can re-open it if desired.

Note that the scala bash script from the archive on https://github.com/lampepfl/dotty/releases/tag/3.0.0 acts as runner script or repl launcher, depending on the arguments. But given how low it appears on the download page I don't think anyone is using that.

[bjornregnell]

I'm using it :)

Ok; good to reduce overlap among issues.

This also depends on if cs can be the official thing that can meet "all" use cases...

I guess one reason for the low usage could be the lack of easy install of Scala 3 on Windows. Do you have some info on the download stats of the Scala 2 .msi?

[lrytz]

I'm using it :)

Nice, sorry about my skepticism :)

download stats of the Scala 2 .msi?

I didn't manage to get these stats unfortunately. The files are hosted on a S3 bucket at lightbend, and we're not currently processing the access logs.