Features

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

Requirements

• sbt 1.0.1+
• Scala 2.4.0+

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

Getting started from a template

$ sbt new earldouglas/sbt-frege.g8
A project built with sbt-frege

name [My Frege Project]: hello frege

Template applied in ./hello-frege

$ cd hello-frege/
$ sbt
> test
example.HelloWorldSuite:
  + multiply 0.008s
  + showWork 0.016s
[info] Passed: Total 2, Failed 0, Errors 0, Passed 2
> run
[info] 6 * 7 = 42

Getting started from scratch

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.HelloWorld where

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

Build and run it:

$ sbt
> compile
> run
Hello, world!

Try it from the Frege REPL:

$ sbt
> fregeRepl

frege> import example.HelloWorld (main)

frege> main []
Hello, world!
()

Configuration

Frege compiler

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

Frege REPL

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

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