val filesHere = (new java.io.File(".")).listFiles
def fileLines(file: java.io.File) =
    scala.io.Source.fromFile(file).getLines.toList
def scalaFiles = 
    for {
	file <- filesHere
	if file.getName.endsWith(".scala")
    } yield file

for (f <- scalaFiles) println(f.getName)

val forLineLengths = 
    for {
	file <- filesHere
	if file.getName.endsWith(".scala")
	line <- fileLines(file)
	trimmed = line.trim
	if trimmed.matches(".*for.*")
    } yield trimmed.length

for (i <- forLineLengths) println(i)