Command line tool to shrink a JAR file, such as produced by leiningens uberjar.
This is especially useful for Frege stand-alone jars, because the compiler/library JAR is 20MB or more. And yet, many programs use only a tiny bit of the standard-library and don't use the compiler code at all.
The actual shrinking is done by ProGuard, this tool just creates the clumsy configuration file and runs Proguard.