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package mill.playlib
import java.net.URI
import java.nio.file._
import java.nio.file.attribute.BasicFileAttributes
import java.util
import mill.{PathRef, T}
import mill.scalalib.{Lib, ScalaModule}
trait Static extends ScalaModule {
/**
* project resources including configuration, webjars and static assets
*/
override def resources = T.sources {
super.resources() :+ webJarResources() :+ staticAssets()
}
/**
* Resource base path of packaged assets (path they will appear in in the jar)
*/
def assetsPath = T{ "public" }
/**
* Directories to include assets from
*/
def assetSources = T.sources{ millSourcePath / assetsPath() }
/*
Collected static assets for the project
*/
def staticAssets = T {
val toPath = os.Path(assetsPath(), T.ctx().dest)
assetSources().foreach{ pathRef =>
val fromPath = pathRef.path
if (os.isDir(fromPath)) {
os.walk(fromPath).filter(os.isFile(_)).foreach{ p =>
os.copy(p, toPath / p.relativeTo(fromPath), createFolders = true)
}
}
}
PathRef(T.ctx().dest)
}
/**
* webjar dependencies - created from transitive ivy deps
*/
def webJarDeps = T{
transitiveIvyDeps().filter(_.dep.module.organization.value == "org.webjars")
}
/**
* jar files of web jars
*/
def webJars = T{
Lib.resolveDependencies(repositories, Lib.depToDependency(_, scalaVersion()), webJarDeps())
}
/**
* webjar resources extracted from their source jars with version from path removed
*/
def webJarResources = T {
extractWebJars(webJars().toSeq, os.Path(assetsPath(), T.ctx().dest) / 'lib)
PathRef(T.ctx().dest)
}
private def extractWebJars(jars: Seq[PathRef], webJarBase: os.Path): Unit = {
import scala.collection.JavaConverters._
val prefix = "/META-INF/resources/webjars/"
jars.foreach{ jarRef =>
val uri = s"jar:file:${jarRef.path}"
val env = Map.empty[String,String].asJava
val zipFs = FileSystems.newFileSystem(URI.create(uri), env)
try {
for(root <- zipFs.getRootDirectories.asScala) {
Files.walkFileTree(root, util.EnumSet.noneOf(classOf[FileVisitOption]), Int.MaxValue,
new SimpleFileVisitor[Path] {
override def visitFile(file: Path, attrs: BasicFileAttributes) = {
if (file.startsWith(prefix)) {
val rel = os.RelPath(file.toString.substring(prefix.length))
val toFile = webJarBase / os.RelPath(rel.segments(0) +: rel.segments.drop(2), 0)
//println(s"$file -> $toFile")
os.makeDir.all(toFile / os.up)
Files.copy(file, toFile.toNIO)
}
FileVisitResult.CONTINUE
}
}
)
}
}
finally {
zipFs.close()
}
}
}
}
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