Interpolates $MILL_VERSION in ivy imports (#649)

* Interpolates $MILL_VERSION in ivy imports

This overrides the default $ivy magic import by replacing the
`$MILL_VERSION` string with mill's version, in order to facilitate
the loading/update of contrib modules.

Ammonite had to be bumped to 1.6.9

* Removed bloop import

* AmmoniteExit import fix

* Removed repl dep check

* Removed problematic check

* Made ammonite version override-able

1 files changed, 15 insertions, 0 deletions

diff --git a/main/src/main/MillIvyHook.scala b/main/src/main/MillIvyHook.scala
new file mode 100644
index 00000000..2b4eb6a7
--- /dev/null
+++ b/main/src/main/MillIvyHook.scala
@@ -0,0 +1,15 @@
+package mill.main
+import ammonite.runtime.ImportHook.BaseIvy
+import ammonite.runtime.ImportHook
+import java.io.File
+
+/**
+ * Overrides the ivy hook to interpret $MILL_VERSION as the version of mill
+ * the user runs.
+ *
+ * Can be used to ensure loaded contrib modules keep up to date.
+ */
+object MillIvyHook extends BaseIvy(plugin = false){
+  override def resolve(interp: ImportHook.InterpreterInterface, signatures: Seq[String]): Either[String,Set[File]] =
+    super.resolve(interp, signatures.map(_.replace("$MILL_VERSION", mill.BuildInfo.millVersion)))
+}