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package cbt
import java.io.File
/** You likely want to use the factory method in the BasicBuild class instead of this. */
object DirectoryDependency {
def apply( path: File, subBuild: String )( implicit context: Context ): LazyDependency =
apply( path, Some( subBuild ) )
def apply( path: File, subBuild: Option[String] = None )( implicit context: Context ): LazyDependency =
apply( context.copy( workingDirectory = path ), subBuild )
def apply( context: Context, subBuild: Option[String] ): LazyDependency = {
val lib: Lib = new Lib( context.logger )
val d = context.workingDirectory
val relativeBuildFile = lib.buildDirectoryName ++ File.separator ++ lib.buildFileName
val buildDirectory = d / lib.buildDirectoryName
val buildFile = buildDirectory / lib.buildFileName
if ( !buildFile.isFile && ( buildDirectory / "Build.scala" ).isFile ) {
throw new Exception(
s"""expected $relativeBuildFile but found ${lib.buildDirectoryName ++ File.separator ++ "Build.scala"} in $d"""
)
}
if ( buildDirectory.exists && buildDirectory.listOrFail.nonEmpty && !buildFile.exists ) {
throw new Exception(
s"No file ${lib.buildFileName} (lower case) found in " ++ buildDirectory.string
)
}
def loadBuild: AnyRef = {
val actualBuildFile = (
buildFile.getParentFile.getCanonicalFile.getName ++ File.separator ++ buildFile.getCanonicalFile.getName
)
if ( actualBuildFile =!= relativeBuildFile ) {
throw new Exception( s"expected $relativeBuildFile but found $actualBuildFile in " ++ context.workingDirectory.string )
}
if ( buildFile.isFile ) (
loadCustomBuildWithDifferentCbtVersion
getOrElse loadCustomBuild
)
else if ( d.getCanonicalFile.getName === lib.buildDirectoryName && ( d / lib.buildFileName ).exists )
new cbt.ConcreteBuildBuild( context )
else
new BasicBuild( context )
}
def loadCustomBuildWithDifferentCbtVersion: Option[AnyRef] = {
( "cbt:" ++ GitDependency.GitUrl.regex ++ "#[a-z0-9A-Z]+" ).r
.findFirstIn( buildFile.readAsString )
.map( _.drop( 4 ).split( "#" ) )
.flatMap {
case Array( base, hash ) =>
val sameCbtVersion = context.cbtHome.string.contains( hash )
if ( sameCbtVersion ) 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 ( checkoutDirectory, dependency ) =
GitDependency.withCheckoutDirectory( base, hash, Some( "nailgun_launcher" ) )(
context.copy( scalaVersion = None )
)
dependency
.dependency
.asInstanceOf[BaseBuild] // should work because nailgun_launcher/ has no cbt build of it's own
.classLoader
.loadClass( "cbt.NailgunLauncher" )
.getMethod( "getBuild", classOf[AnyRef] )
.invoke( null, context.copy( cbtHome = checkoutDirectory ) )
}
}
}
def loadCustomBuild: AnyRef = {
lib.logger.composition( "Loading build at " ++ buildDirectory.string )
val buildBuild = apply(
context.copy( workingDirectory = buildDirectory, scalaVersion = None ), None
).dependency.asInstanceOf[BuildInterface]
import buildBuild._
val managedContext = context.copy( parentBuild = Some( buildBuild ) )
val buildClasses =
buildBuild.exportedClasspath.files.flatMap(
lib.topLevelClasses( _, classLoader, false )
.filter( _.getSimpleName === lib.buildClassName )
.filter( classOf[BaseBuild] isAssignableFrom _ )
)
if ( buildClasses.size === 0 ) {
throw new Exception(
s"You need to define a class ${lib.buildClassName} extending an appropriate super class in\n"
+ buildFile ++ "\nbut none found."
)
} else if ( buildClasses.size > 1 ) {
throw new Exception(
s"You need to define exactly one class ${
lib.buildClassName
} extending an appropriate build super class, but multiple found in "
+ buildDirectory + ":\n" + buildClasses.mkString( "\n" )
)
} else {
val buildClass = buildClasses.head
buildClass.constructors.find( _.parameterTypes.toList === List( classOf[Context] ) ).map {
_.newInstance( managedContext ).asInstanceOf[AnyRef]
}.getOrElse {
throw new Exception(
s"Expected class ${lib.buildClassName}(val context: Context), but found different constructor in\n"
+ buildDirectory ++ "\n"
+ buildClass ++ "(" ++ buildClass.getConstructors.map( _.getParameterTypes.mkString( ", " ) ).mkString( "; " ) + ")"
)
}
}
}
// wrapping this in lazy so builds are not loaded from disk immediately
// this definitely has the advantages that cbt can detect cycles in the
// dependencies, but might also positively affect performance
new LazyDependency( {
val build = lib.getReflective( loadBuild, subBuild )( context )
try {
build.asInstanceOf[Dependency]
} catch {
case e: ClassCastException =>
throw new RuntimeException( "Your class " ++ lib.buildClassName ++ s" needs to extend class BaseBuild in $buildFile", e )
}
} )( context.logger, context.transientCache, context.classLoaderCache )
}
}
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