Fixes#2761
With sbt 0.13.13-RC1 rediscovered that the dependency pulled in from
Giter8 was affecting the plugins. To avoid this, this change splits up
the template resolver implementation to another module called
sbt-giter8-resolver, and it will be downloaded using Ivy into
`~/.sbt/0.13/templates/`, and then launched reflectively using Java as
the interface.
The compiler interface subclasses `scala.tools.nsc.Global`,
and loading this new subclass before each `compile` task forces
HotSpot JIT to deoptimize larges swathes of compiled code. It's
a bit like SBT has rigged the dice to always descend the longest
ladder in a game of Snakes and Ladders.
The slowdown seems to be larger with Scala 2.12. There are a number
of variables at play, but I think the main factor here is that
we now rely on JIT to devirtualize calls to final methods in traits
whereas we used to emit static calls. JIT does a good job at this,
so long as classloading doesn't undo that good work.
This commit extends the existing `ClassLoaderCache` to encompass
the classloader that includes the compiler interface JAR. I've
resorted to adding a var to `AnalyzingCompiler` to inject the
dependency to get the cache to the spot I need it without binary
incompatible changes to the intervening method signatures.
Backports #2741, Fixes#1041e93c445 added a feature called early command, which uses `--` as a
prefix to denote some commands that runs ahead of session loading.
While the feature might be useful especially for logging, `--` is too
useful just for this purpose.
In addition, this adds log level commands with single `-`, such as
-error to treat them as early commands; and keeps `--` variant for log
level for backward compatibility.
* Backport style changes in tests and Defaults.scala
This backports the scripted tests and Defaults.scala style changes to
use `build.sbt` and `:=`.
* Fix backport
* Deprecate the old operators `<<=`, `<+=`, and `<++=`
The no-longer-documented operators `<<=`, `<+=`, and `<++=` are
deprecated in anticipation of the removal in sbt 1.0. Ref #2711
For `<<=`, the suggested migration would be to use either `:=` or `~=`
operators. The RHS of `<<=` takes an `Initialize[_]` expression, which
can be converted to `:=` style by wrapping the expression in
parenthesis, and calling `.value` at the end.
This adds support to generate synthetic subprojects from an auto plugin.
In addition, a method called `projectOrigin` is added to distinguish
Organic, BuildExtra, ProjectExtra, and GenericRoot.
Calling the `.value` method on an input task returns `InputTask[A]`, which is completely unintuitive. I think it's basically a bug in `.value`. This change deprecates the `.value` call on input tasks, in preparation to the removal in sbt 1.0.
In most cases `.evaluated` should be called, which returns `A` by evaluating the task. Just in case `InputTask[A]` is needed, `inputTaskValue` method is now provided.
One of the motivation for doing this now is the deprecation of old operators `<<=`, which forces more users to convert to the `:=` style and potentially run into the `.value` behavior.
Eugene Yokota
Miles Sabin
Dale Wijnand
Jason Zaugg
Jaroslaw Grabowski
Martin Duhem