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• Compile Frege code from your project'ssrc/main/frege/ directory
• Call Frege code from your project's Java/Scala/etc. code
• Launch theFrege REPL with your project's classes and libraries

• sbt 1.0.1+
• Scala 2.4.0+

For sbt 0.13.6+ projects, use sbt-frege version 1.1.3

$ sbt new earldouglas/sbt-frege.g8A project built with sbt-fregename [My Frege Project]: hello fregeTemplate applied in ./hello-frege$ cd hello-frege/$ sbt> testexample.HelloWorldSuite:  + multiply 0.008s  + showWork 0.016s[info] Passed: Total 2, Failed 0, Errors 0, Passed 2> run[info] 6 * 7 = 42

Add the Frege sbt plugin to your project:

project/plugins.sbt:

addSbtPlugin("com.earldouglas"%"sbt-frege"%"3.0.3")

Write some Frege code:

src/main/frege/example/HelloWorld.fr:

package example.HelloWorldwheremain:: [String]->IO()main _= println"Hello, world!"

Build and run it:

$ sbt> compile> runHello, world!

Try it from the Frege REPL:

$ sbt> fregeReplfrege> import example.HelloWorld (main)frege> main []Hello, world!()

• fregeOptions: Seq[String] - Extra options for fregec
• fregeSource: File - Frege source directory (defaultsrc/main/frege/)
• fregeTarget: File - Frege target directory (defaulttarget/frege/)
• fregeCompiler: String - Full name of the Frege compiler (defaultfrege.compiler.Main)
• fregeLibrary: ModuleID - Frege library (fregec.jar) to use (defaultFrege 3.23.288)

• fregeReplVersion: String - The version offrege-repl to use(default 1.3)
• fregeReplMainClass: String - The Frege REPL main class (defaultfrege.repl.FregeRepl)

Though sbt-frege uses 3.24.100.1 by default, Frege REPL 1.3 depends onFrege 3.23.288, so it takes priority when launchingfregeRepl.