using sbt from within Netbeans

[Stefan]

Hi all

I use sbt from within Netbeans. The problem until now was that the
compiler output of sbt was not recognized by Netbeans. In Netbeans
clickable lines must follow a specific pattern:

<absolute file path>:<line>: <explanation>

The output of sbt is:

[info|error|...] <absolute file path>:<line>: explanation

The leading label "[info|error|...] prevents Netbeans from recognizing
these lines. I modified by sbt shellscript the following way:

#!/bin/sh
if [ "$1" = "-modifyOutput" ] ; then
shift
java -Xmx256M -Dsbt.log.noformat=true -jar `dirname $0`/sbt-
launcher.jar "$@" | sed -r -e "s/^[[](debug|info|warn|error)[]] (.+:
[0-9]+:) (.*)/\2 \1: \3/"
else
java -Xmx256M -jar `dirname $0`/sbt-launcher.jar "$@"
fi

Now sed modifies lines which are most likely located messages into the
expected form.

It would be nice if sbt would have a switch to tweak the output format
accordingly. (Maybe the flag sbt.log.noformat could also means that
the log level is not prepended.)

[Mark Harrah]

sbt.log.noformat should keep its current meaning, since it is intended for when people want to disable
ansi codes. There are a lot of things that could be tweaked with logging, though, and I'd rather not
cram more into system properties, which I consider to be temporary or subject to change anyway.

The way to do it would be to implement your own logger:

class CustomLogger extends BasicLogger
{
def success(message: => String) = ...
def trace(t: => Throwable) = ...
def log(level: Level.Value, message: => String) = ...
def control(event: ControlEvent.Value, message: => String) = ...
def logAll(events: Seq[LogEvent]) = events.foreach(log)
}

(Yes, logAll and its implementation should be in BasicLogger so you don't have to implement it.)

To use it and override logImpl in your project definition:
override def logImpl = new CustomLogger
or
override def logImpl = new BufferedLogger(new CustomLogger)
if you want it buffered when running a build in parallel.

I haven't published the API documentation for 0.7.0 yet, but you can see the logging related source code
at:

http://github.com/harrah/sbt/blob/using-xsbt/src/main/scala/sbt/Logger.scala

-Mark