With SBT, how do I a specify an alternate project root other than the current directory for running a main class?

Question

Normally SBT looks for the build files at ./build.sbt and ./project/Build.scala. Is it possible to specify an alternate project root, so I can buil

Answer 1

As I discovered from this other answer, the sbt-start-script plugin is a better tool for this than sbt run-main. You can simply run sbt stage and you get an invocation script, with classpaths resolved, at target/start. According to the documentation, it needs to be run from the build root directory for inter-project dependencies to work, but for my simple use cases, this doesn't seem to be a problem.