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additional utility methods

This commit is contained in:
Mark Harrah 2010-11-24 14:09:02 -05:00
parent ccf0508ce6
commit 9d6a4f70f7
2 changed files with 17 additions and 2 deletions
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11
util/io/IO.scala
View File

@ -13,7 +13,7 @@ import java.util.Properties
import java.util.jar.{Attributes, JarEntry, JarFile, JarInputStream, JarOutputStream, Manifest}
import java.util.zip.{CRC32, GZIPOutputStream, ZipEntry, ZipFile, ZipInputStream, ZipOutputStream}
import scala.collection.immutable.TreeSet
import scala.collection.mutable.HashSet
import scala.collection.mutable.{HashMap,HashSet}
import scala.reflect.{Manifest => SManifest}
import Function.tupled
@ -244,6 +244,15 @@ object IO
private[sbt] def jars(dir: File): Iterable[File] = listFiles(dir, GlobFilter("*.jar"))
def deleteIfEmpty(dirs: collection.Set[File]): Unit =
{
val isEmpty = new HashMap[File, Boolean]
def visit(f: File): Boolean = isEmpty.getOrElseUpdate(f, dirs(f) && f.isDirectory && (f.listFiles forall visit) )
dirs foreach visit
for( (f, true) <- isEmpty) f.delete
}
def delete(files: Iterable[File]): Unit = files.foreach(delete)
def delete(file: File)
{

8
util/io/PathMapper.scala
View File

@ -3,7 +3,7 @@
*/
package sbt
import java.io.File
import java.io.File
trait Mapper
{
@ -51,4 +51,10 @@ trait Alternatives
new Alternative[A,B] { def | (g: A => Option[B]) =
(a: A) => f(a) orElse g(a)
}
final def alternatives[A,B](alts: Seq[A => Option[B]]): A => Option[B] =
alts match
{
case Seq(f, fs @ _*) => f | alternatives(fs)
case Seq() => a => None
}
}