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Merge pull request #205 from alexarchambault/topic/find-main-class 

Better lookup of main class by launch command
This commit is contained in:
Alexandre Archambault 2016-03-23 17:50:40 +01:00
parent fd4d1bd1dc 20ad158437
commit caf69da816
2 changed files with 24 additions and 5 deletions
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22
cli/src/main/scala-2.11/coursier/cli/Helper.scala
View File

@ -2,6 +2,8 @@ package coursier
package cli
import java.io.{ OutputStreamWriter, File }
import java.net.URL
import java.util.jar.{ Manifest => JManifest }
import java.util.concurrent.Executors
import coursier.ivy.IvyRepository
@ -15,17 +17,27 @@ object Helper {
def errPrintln(s: String) = Console.err.println(s)
private val manifestPath = "META-INF/MANIFEST.MF"
def mainClasses(cl: ClassLoader): Map[(String, String), String] = {
import scala.collection.JavaConverters._
val metaInfs = cl.getResources("META-INF/MANIFEST.MF").asScala.toVector
val parentMetaInfs = Option(cl.getParent).fold(Set.empty[URL]) { parent =>
parent.getResources(manifestPath).asScala.toSet
}
val allMetaInfs = cl.getResources(manifestPath).asScala.toVector
val metaInfs = allMetaInfs.filterNot(parentMetaInfs)
val mainClasses = metaInfs.flatMap { url =>
val attributes = new java.util.jar.Manifest(url.openStream()).getMainAttributes
val attributes = new JManifest(url.openStream()).getMainAttributes
val vendor = Option(attributes.getValue("Specification-Vendor")).getOrElse("")
val title = Option(attributes.getValue("Specification-Title")).getOrElse("")
val mainClass = Option(attributes.getValue("Main-Class"))
def attributeOpt(name: String) =
Option(attributes.getValue(name))
val vendor = attributeOpt("Specification-Vendor").getOrElse("")
val title = attributeOpt("Specification-Title").getOrElse("")
val mainClass = attributeOpt("Main-Class")
mainClass.map((vendor, title) -> _)
}

7
cli/src/main/scala-2.11/coursier/cli/Launch.scala
View File

@ -143,6 +143,13 @@ case class Launch(
else {
val mainClasses = Helper.mainClasses(loader)
if (options.common.verbosityLevel >= 2) {
Console.err.println("Found main classes:")
for (((vendor, title), mainClass) <- mainClasses)
Console.err.println(s" $mainClass (vendor: $vendor, title: $title)")
Console.err.println("")
}
val mainClass =
if (mainClasses.isEmpty) {
Helper.errPrintln("No main class found. Specify one with -M or --main.")