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package mill.util
import java.io._
import ammonite.ops.{Path, rm}
import ammonite.util.Colors
/**
* The standard logging interface of the Mill build tool.
*
* Contains these primary logging methods, in order of increasing importance:
*
* - `debug` : internal debug messages normally not shown to the user;
* mostly useful when debugging issues
*
* - `ticker`: short-lived logging output where consecutive lines over-write
* each other; useful for information which is transient and disposable
*
* - `info`: miscellaneous logging output which isn't part of the main output
* a user is looking for, but useful to provide context on what Mill is doing
*
* - `error`: logging output which represents problems the user should care
* about
*
*
* Also contains the two forwarded stdout and stderr streams, for code executed
* by Mill to use directly. Typically these correspond to the stdout and stderr,
* but when `show` is used both are forwarded to stderr and stdout is only
* used to display the final `show` output for easy piping.
*/
trait Logger {
def colored: Boolean
val errorStream: PrintStream
val outputStream: PrintStream
val inStream: InputStream
def info(s: String): Unit
def error(s: String): Unit
def ticker(s: String): Unit
def debug(s: String): Unit
def close(): Unit = ()
}
object DummyLogger extends Logger {
def colored = false
object errorStream extends PrintStream(_ => ())
object outputStream extends PrintStream(_ => ())
val inStream = new ByteArrayInputStream(Array())
def info(s: String) = ()
def error(s: String) = ()
def ticker(s: String) = ()
def debug(s: String) = ()
}
class CallbackStream(wrapped: OutputStream,
setPrintState0: PrintState => Unit) extends OutputStream{
def setPrintState(c: Char) = {
setPrintState0(
c match{
case '\n' => PrintState.Newline
case '\r' => PrintState.Newline
case _ => PrintState.Middle
}
)
}
override def write(b: Array[Byte]): Unit = {
if (b.nonEmpty) setPrintState(b(b.length-1).toChar)
wrapped.write(b)
}
override def write(b: Array[Byte], off: Int, len: Int): Unit = {
if (len != 0) setPrintState(b(off+len-1).toChar)
wrapped.write(b, off, len)
}
def write(b: Int) = {
setPrintState(b.toChar)
wrapped.write(b)
}
}
sealed trait PrintState
object PrintState{
case object Ticker extends PrintState
case object Newline extends PrintState
case object Middle extends PrintState
}
case class PrintLogger(
colored: Boolean,
disableTicker: Boolean,
colors: ammonite.util.Colors,
outStream: PrintStream,
infoStream: PrintStream,
errStream: PrintStream,
inStream: InputStream,
debugEnabled: Boolean
) extends Logger {
var printState: PrintState = PrintState.Newline
override val errorStream = new PrintStream(new CallbackStream(errStream, printState = _))
override val outputStream = new PrintStream(new CallbackStream(outStream, printState = _))
def info(s: String) = {
printState = PrintState.Newline
infoStream.println(colors.info()(s))
}
def error(s: String) = {
printState = PrintState.Newline
errStream.println(colors.error()(s))
}
def ticker(s: String) = {
if(!disableTicker) {
printState match{
case PrintState.Newline =>
infoStream.println(colors.info()(s))
case PrintState.Middle =>
infoStream.println()
infoStream.println(colors.info()(s))
case PrintState.Ticker =>
val p = new PrintWriter(infoStream)
val nav = new ammonite.terminal.AnsiNav(p)
nav.up(1)
nav.clearLine(2)
nav.left(9999)
p.flush()
infoStream.println(colors.info()(s))
}
printState = PrintState.Ticker
}
}
def debug(s: String) = if (debugEnabled) {
printState = PrintState.Newline
errStream.println(colors.info()(s))
}
}
case class FileLogger(colored: Boolean, file: Path, debugEnabled: Boolean) extends Logger {
private[this] var outputStreamUsed: Boolean = false
lazy val outputStream = {
if (!outputStreamUsed) rm(file)
outputStreamUsed = true
new PrintStream(new FileOutputStream(file.toIO.getAbsolutePath))
}
lazy val errorStream = {
if (!outputStreamUsed) rm(file)
outputStreamUsed = true
new PrintStream(new FileOutputStream(file.toIO.getAbsolutePath))
}
def info(s: String) = outputStream.println(s)
def error(s: String) = outputStream.println(s)
def ticker(s: String) = outputStream.println(s)
def debug(s: String) = if (debugEnabled) outputStream.println(s)
val inStream: InputStream = DummyInputStream
override def close() = {
if (outputStreamUsed)
outputStream.close()
}
}
class MultiStream(stream1: OutputStream, stream2: OutputStream) extends PrintStream(new OutputStream {
def write(b: Int): Unit = {
stream1.write(b)
stream2.write(b)
}
override def write(b: Array[Byte]): Unit = {
stream1.write(b)
stream2.write(b)
}
override def write(b: Array[Byte], off: Int, len: Int) = {
stream1.write(b, off, len)
stream2.write(b, off, len)
}
override def flush() = {
stream1.flush()
stream2.flush()
}
override def close() = {
stream1.close()
stream2.close()
}
})
case class MultiLogger(colored: Boolean, logger1: Logger, logger2: Logger) extends Logger {
lazy val outputStream: PrintStream = new MultiStream(logger1.outputStream, logger2.outputStream)
lazy val errorStream: PrintStream = new MultiStream(logger1.errorStream, logger2.errorStream)
lazy val inStream = Seq(logger1, logger2).collectFirst{case t: PrintLogger => t} match{
case Some(x) => x.inStream
case None => new ByteArrayInputStream(Array())
}
def info(s: String) = {
logger1.info(s)
logger2.info(s)
}
def error(s: String) = {
logger1.error(s)
logger2.error(s)
}
def ticker(s: String) = {
logger1.ticker(s)
logger2.ticker(s)
}
def debug(s: String) = {
logger1.debug(s)
logger2.debug(s)
}
override def close() = {
logger1.close()
logger2.close()
}
}
|
