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import mill.define.Task
import mill.eval.PathRef
object Foo {
import java.io.FileOutputStream
import java.util.jar.JarEntry
import ammonite.ops.{ls, pwd, read}
import mill.discover.Discovered
import mill.util.Ctx
val workspacePath = pwd / 'target / 'workspace / 'javac
val javacSrcPath = pwd / 'src / 'test / 'examples / 'javac
val javacDestPath = workspacePath / 'src
val sourceRootPath = javacDestPath / 'src
val resourceRootPath = javacDestPath / 'resources
// sourceRoot -> allSources -> classFiles
// |
// v
// resourceRoot ----> jar
val sourceRoot = Task.path(sourceRootPath)
val resourceRoot = Task.path(resourceRootPath)
val allSources = list(sourceRoot)
val classFiles = compileAll(allSources)
val jar = jarUp(resourceRoot, classFiles)
def compileAll(sources: Task[Seq[PathRef]]) = {
new Task.Subprocess(
Seq(sources),
args =>
Seq("javac") ++
args[Seq[PathRef]](0).map(_.path.toString) ++
Seq("-d", args.dest.toString)
).map(_.dest)
}
def list(root: Task[PathRef]): Task[Seq[PathRef]] = {
root.map(x => ls.rec(x.path).map(PathRef(_)))
}
case class jarUp(roots: Task[PathRef]*) extends Task[PathRef] {
val inputs = roots
def evaluate(args: Ctx): PathRef = {
val output = new java.util.jar.JarOutputStream(new FileOutputStream(args.dest.toIO))
for {
root0 <- args.args
root = root0.asInstanceOf[PathRef]
path <- ls.rec(root.path)
if path.isFile
} {
val relative = path.relativeTo(root.path)
output.putNextEntry(new JarEntry(relative.toString))
output.write(read.bytes(path))
}
output.close()
args.dest
}
}
}
@main def main(): Any = Foo -> mill.Discovered[Foo.type]
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