**Problem**
There are a few places where javaHome or java path is set,
using java.home system property. The problem is that it points to JRE,
not JDK, so it would break on Java compilation etc.
**Solution**
If the path ends with jre, go up one directory.
**Problem**
It's currently not easy to write a scripted test that works on
both sbt 1.x and 2.x when you want to write exists test under target.
**Solution**
Since we can only use the file system (and not evaluate Scala version etc)
1. this implements glob expression support in `exists`, `absent`, and `delete`.
2. this also introduces `||` operator that would mean a or b.
**Problem**
`java.net.URL` calls out to the network to perform `equals`,
so we should remove that from anywhere that can be involved in caching etc.
**Solution**
This changes java.net.URL to java.net.URI in Keys.
**Problem**
Whether a subproject is root or not is currently detected by
comparing getCanonicalFile against the build base directory.
Problem is that often the root project uses "." as the directory,
and getting the canonical file works ok for the current build,
but it breaks when loading `ProjectRef`.
There might be other bugs related to the root project detection.
**Solution**
This factors out `isRootPath` function that's aware of the build base.
This PR adds the repro test prepared by xuwei-k.
**Problem**
Currently the following warning shows up while compiling metabuild:
[warn] Failed to parse `-Wconf` configuration: cat=unused-nowarn:s
[warn] unknown category: unused-nowarn
-Wconf:cat=unused-nowarn in general was added as a Scala 2.12 of
falsely warning about pure expression not doing anything in the macro.
**Solution**
We should be able to remove the -Wconf flag in sbt 2.x.
**Problem**
Slash syntax is currently implemented via a series of implicit
converters (Conversion), which is not nice, partly because
the behavior is difficult to follow.
**Solution**
This removes all the implicit converters and moves the slashes
into:
1. / methods under Reference for subproject scoping.
2. / methods under ScopeAxis with Reference type constraint
for the initial Zero scoping.
3. Return RefThenConfig structure for intermediate config scoping.
4. / method under `Scoped`, which is base trait for the keys
to implement task scoping e.g. `compile / scalacOptions`.
5. Extension methods for ConfigKey.
6. Extension methods for AttributeKey.
Problem
Currently Scala 3.x - 2.13 sandwich doesn't seem to work for projectMatrix.
This is due to isScala2Scala3Sandwich checking for "3." while projectMatrix
uses scalaBinaryVersion, which is 3.
Solution
This consolidates the implementation of isScala2Scala3Sandwich with the one
in Defaults module, and check for both "3" and "3."
João Ferreira
eugene yokota
Matthew de Detrich
kenji yoshida
adpi2
friendseeker