Accept build.scala and Build.scala

cvogt · Oct 10, 2016 · 174ceef · 174ceef
1 parent f691119
commit 174ceef
Showing 1 changed file with 52 additions and 43 deletions.
diff --git a/stage2/BuildBuild.scala b/stage2/BuildBuild.scala
@@ -1,4 +1,5 @@
 package cbt
+import java.io.File
 import java.nio.file._
 
 trait BuildBuild extends BaseBuild{
@@ -20,62 +21,70 @@ trait BuildBuild extends BaseBuild{
 
   override def dependencies =
     super.dependencies :+ context.cbtDependency
-  def managedBuildDirectory: java.io.File = lib.realpath( projectDirectory.parent )
+  def managedBuildDirectory: File = lib.realpath( projectDirectory.parent )
   private object managedBuildCache extends Cache[BuildInterface]
   def managedBuild = managedBuildCache{
     val managedBuildFile = projectDirectory++"/Build.scala"
     logger.composition("Loading build at "++managedContext.projectDirectory.toString)
-    val build = (
-      if(managedBuildFile.exists){
-        val contents = new String(Files.readAllBytes(managedBuildFile.toPath))
-        val cbtUrl = ("cbt:"++GitDependency.GitUrl.regex++"#[a-z0-9A-Z]+").r
-        cbtUrl
-          .findFirstIn(contents)
-          .flatMap{
-            url =>
-            val Array(base,hash) = url.drop(4).split("#")
-            if(context.cbtHome.string.contains(hash))
-              None
-            else Some{
-              // Note: cbt can't use an old version of itself for building,
-              // otherwise we'd have to recursively build all versions since
-              // the beginning. Instead CBT always needs to build the pure Java
-              // Launcher in the checkout with itself and then run it via reflection.
-              val dep = new GitDependency(base, hash, Some("nailgun_launcher"))
-              val ctx = managedContext.copy( cbtHome = dep.checkout )
-              dep.classLoader(classLoaderCache)
-                .loadClass( "cbt.NailgunLauncher" )
-                .getMethod( "getBuild", classOf[AnyRef] )
-                .invoke( null, ctx )
-            }
-          }.getOrElse{
-            try{
-              classLoader(context.classLoaderCache)
-                .loadClass(lib.buildClassName)
-                .getConstructors.head
-                .newInstance(managedContext)
-              } catch {
-                case e: ClassNotFoundException if e.getMessage == lib.buildClassName => 
-                  throw new Exception("You need to define a class Build in Build.scala in: "+context.projectDirectory)
-              }
-          }
-      } else if( projectDirectory.listFiles.exists( _.getName.endsWith(".scala") ) ){
-        throw new Exception(
-          "No file Build.scala (upper case) found in " ++ projectDirectory.getPath
-        )
-      } else if( projectDirectory.getParentFile.getName == "build" ){
-        new BasicBuild( managedContext ) with BuildBuild
+    val build = if (managedBuildFile.exists) {
+      managedBuildFrom(managedBuildFile)
+    } else if (projectDirectory.listFiles.exists(_.getName.endsWith(".scala"))) {
+      System.err.println("No file Build.scala (upper case) found in " ++ projectDirectory.getPath)
+      val backupBuildFile = projectDirectory ++ "/build.scala"
+      if (backupBuildFile.exists) {
+        System.err.println("Trying build.scala in " ++ projectDirectory.getPath)
+        managedBuildFrom(backupBuildFile)
       } else {
-        new BasicBuild( managedContext )
+        throw new Exception("No file Build.scala (upper case) found in " ++ projectDirectory.getPath)
       }
-    )
+    } else if (projectDirectory.getParentFile.getName == "build") {
+      new BasicBuild(managedContext) with BuildBuild
+    } else {
+      new BasicBuild(managedContext)
+    }
     try{
       build.asInstanceOf[BuildInterface]
     } catch {
       case e: ClassCastException if e.getMessage.contains("Build cannot be cast to cbt.BuildInterface") =>
         throw new Exception("Your Build class needs to extend BaseBuild in: "+context.projectDirectory, e)
     }
   }
+
+  private def managedBuildFrom(file: File): BuildInterface = {
+    val contents = new String(Files.readAllBytes(file.toPath))
+    val cbtUrl = ("cbt:" ++ GitDependency.GitUrl.regex ++ "#[a-z0-9A-Z]+").r
+    cbtUrl
+      .findFirstIn(contents)
+      .flatMap { url =>
+        val Array(base, hash) = url.drop(4).split("#")
+        if (context.cbtHome.string.contains(hash))
+          None
+        else Some {
+          // Note: cbt can't use an old version of itself for building,
+          // otherwise we'd have to recursively build all versions since
+          // the beginning. Instead CBT always needs to build the pure Java
+          // Launcher in the checkout with itself and then run it via reflection.
+          val dep = new GitDependency(base, hash, Some("nailgun_launcher"))
+          val ctx = managedContext.copy(cbtHome = dep.checkout)
+          dep.classLoader(classLoaderCache)
+            .loadClass("cbt.NailgunLauncher")
+            .getMethod("getBuild", classOf[AnyRef])
+            .invoke(null, ctx)
+            .asInstanceOf[BuildInterface]
+        }
+      } getOrElse {
+        try
+          classLoader(context.classLoaderCache)
+            .loadClass(lib.buildClassName)
+            .getConstructors.head
+            .newInstance(managedContext)
+        catch {
+          case e: ClassNotFoundException if e.getMessage == lib.buildClassName =>
+            throw new Exception("You need to define a class Build in Build.scala in: " + context.projectDirectory)
+        }
+      }.asInstanceOf[BuildInterface]
+  }
+
   override def triggerLoopFiles = super.triggerLoopFiles ++ managedBuild.triggerLoopFiles
   override def finalBuild: BuildInterface = if( context.projectDirectory == context.cwd ) this else managedBuild.finalBuild
 }