jps-bootstrap

jps-bootstrap: a small utility that loads JPS project, compiles it, and runs any class from it.

It tries very hard to run your code that same way you'd run it from IDE's gutter.

Previous way of running build scripts

Locally: run *.gant from IDEA or via gant.xml

On buildserver: gant.xml

Downsides:

Supports only groovy code. We're tired of groovy.
Uses binary dependencies for JPS & Utils, which defies the monorepo approach and also creates duplicate classes in IDEA project
Hard to generate and process build output. On buildserver it's not easy to output something correctly, the output is intercepted and processed by both TeamCity code and ant

just run CLASS_NAME from IDEA
run any main class (written in Java/Kotlin/Groovy) from intellij project via
./jps-bootstrap.cmd MODULE_NAME CLASS_NAME ARGS

Example: ./community/platform/jps-bootstrap/jps-bootstrap.sh intellij.idea.ultimate.build DownloadLibrariesBuildTarget

Special wrappers could be written to make scripts easier, see e.g. build/downloadLibraries.cmd

Separate build compiles jps-bootstrap (only when jps-bootstrap sources are changed)
jps-bootstrap is used to run Compile Inc (it compiles build scripts on the fly)
On any other build, jps-bootstrap uses already compiled classes from Compile Inc