Support importing compiler plugins

[TimWSpence]

It would be super awesome if we could import compiler plugins. eg ammonite allows

import $plugin.$ivy.`org.spire-math::kind-projector:0.6.3`

I have no idea if this is feasible or not but it would be epic!

[olafurpg]

Thank you for reporting! You can enable compiler plugins with the $scalac magic import, see example here

mdoc/tests/unit/src/test/scala/tests/imports/ScalacSuite.scala

Line 11 in 24193c5

|import $scalac.`-Wunused:imports -Xfatal-warnings`

You can try to fetch the jar locally first

❯ cs fetch --intransitive org.spire-math:kind-projector_2.12:0.9.10
/Users/lgeirsson/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/spire-math/kind-projector_2.12/0.9.10/kind-projector_2.12-0.9.10.jar

Then add it via -Xplugin:...

import $scalac.`-Xplugin:/Users/lgeirsson/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/spire-math/kind-projector_2.12/0.9.10/kind-projector_2.12-0.9.10.jar`

Can you confirm this works as expected? I'm open to add built-in support for a $plugin magic import

[tgodzik]

I think this doesn't work in worksheets as far as I tried, not sure exactly why.