Implement alternative resolvers

This commit also
- requires Dependencies to explicitly implement canBeCached
- unifies some logic for dependency downloading
- moves SBT-like dependency DSL into its own trait
- error message showing build directory for exceptions in builds
Not splitting this up in favor of faster progress to 1.0.

The user facing API can probably be slightly improved using implicits
inside of BasicBuild, but we can do that later.

1 files changed, 49 insertions, 26 deletions

diff --git a/stage1/Stage1Lib.scala b/stage1/Stage1Lib.scala
index 39310b9..da9f8dd 100644
--- a/stage1/Stage1Lib.scala
+++ b/stage1/Stage1Lib.scala
@@ -56,23 +56,35 @@ class Stage1Lib( val logger: Logger ) extends BaseLib{
   def blue(string: String) = scala.Console.BLUE++string++scala.Console.RESET
   def green(string: String) = scala.Console.GREEN++string++scala.Console.RESET
 
-  def download(urlString: URL, target: File, sha1: Option[String]){
-    val incomplete = Paths.get( target.string ++ ".incomplete" );
-    if( !target.exists ){
-      target.getParentFile.mkdirs
-      logger.resolver(blue("downloading ") ++ urlString.string)
-      logger.resolver(blue("to ") ++ target.string)
-      val stream = urlString.openStream
-      Files.copy(stream, incomplete, StandardCopyOption.REPLACE_EXISTING)
-      sha1.foreach{
-        hash =>
-          val expected = hash
-          val actual = this.sha1(Files.readAllBytes(incomplete))
-          assert( expected == actual, s"$expected == $actual" )
-          logger.resolver( green("verified") ++ " checksum for " ++ target.string)
+  def download(url: URL, target: File, sha1: Option[String]): Boolean = {
+    if( target.exists ){
+      true
+    } else {
+      val incomplete = Paths.get( target.string ++ ".incomplete" );
+      val connection = url.openConnection.asInstanceOf[HttpURLConnection]
+      if(connection.getResponseCode != HttpURLConnection.HTTP_OK){
+        logger.resolver(blue("not found: ") ++ url.string)
+        false
+      } else {
+        logger.resolver(blue("downloading ") ++ url.string)
+        logger.resolver(blue("to ") ++ target.string)
+        target.getParentFile.mkdirs
+        val stream = connection.getInputStream
+        try{
+          Files.copy(stream, incomplete, StandardCopyOption.REPLACE_EXISTING)
+        } finally {
+          stream.close()
+        }
+        sha1.foreach{
+          hash =>
+            val expected = hash
+            val actual = this.sha1(Files.readAllBytes(incomplete))
+            assert( expected == actual, s"$expected == $actual" )
+            logger.resolver( green("verified") ++ " checksum for " ++ target.string)
+        }
+        Files.move(incomplete, Paths.get(target.string), StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
+        true
       }
-      stream.close
-      Files.move(incomplete, Paths.get(target.string), StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
     }
   }
 
@@ -137,26 +149,37 @@ class Stage1Lib( val logger: Logger ) extends BaseLib{
       None
     }else{
       if( needsRecompile ){
-        val zinc = JavaDependency("com.typesafe.zinc","zinc", zincVersion)
+        import MavenRepository.central
+        val zinc = central.resolveOne(MavenDependency("com.typesafe.zinc","zinc", zincVersion))
         val zincDeps = zinc.transitiveDependencies
         
         val sbtInterface =
           zincDeps
-            .collect{ case d @ JavaDependency( "com.typesafe.sbt", "sbt-interface", _, Classifier.none ) => d }
+            .collect{ case d @
+              BoundMavenDependency(
+                MavenDependency( "com.typesafe.sbt", "sbt-interface", _, Classifier.none),
+                _
+              ) => d
+            }
             .headOption
             .getOrElse( throw new Exception(s"cannot find sbt-interface in zinc $zincVersion dependencies: "++zincDeps.toString) )
             .jar
 
         val compilerInterface =
           zincDeps
-            .collect{ case d @ JavaDependency( "com.typesafe.sbt", "compiler-interface", _, Classifier.sources ) => d }
+            .collect{ case d @
+              BoundMavenDependency(
+                MavenDependency( "com.typesafe.sbt", "compiler-interface", _, Classifier.sources),
+                _
+              ) => d
+            }
             .headOption
             .getOrElse( throw new Exception(s"cannot find compiler-interface in zinc $zincVersion dependencies: "++zincDeps.toString) )
             .jar
 
-        val scalaLibrary = JavaDependency("org.scala-lang","scala-library",scalaVersion).jar
-        val scalaReflect = JavaDependency("org.scala-lang","scala-reflect",scalaVersion).jar
-        val scalaCompiler = JavaDependency("org.scala-lang","scala-compiler",scalaVersion).jar
+        val scalaLibrary = central.resolveOne(MavenDependency("org.scala-lang","scala-library",scalaVersion)).jar
+        val scalaReflect = central.resolveOne(MavenDependency("org.scala-lang","scala-reflect",scalaVersion)).jar
+        val scalaCompiler = central.resolveOne(MavenDependency("org.scala-lang","scala-compiler",scalaVersion)).jar
 
         val start = System.currentTimeMillis
 
@@ -212,9 +235,9 @@ class Stage1Lib( val logger: Logger ) extends BaseLib{
 
   def ScalaDependency(
     groupId: String, artifactId: String, version: String, classifier: Classifier = Classifier.none,
-    scalaVersion: String
+    scalaMajorVersion: String
   ) =
-    JavaDependency(
-      groupId, artifactId ++ "_" ++ scalaVersion, version, classifier
+    MavenDependency(
+      groupId, artifactId ++ "_" ++ scalaMajorVersion, version, classifier
     )
-}
\ No newline at end of file
+}