TIL How To Add Scapegoat To IntelliJ's Build Process

At work, we have been using Scapegoat with sbt to check for code smells. Scapegoat is a static code analyzer
that has an sbt plugin and we are using that to do our analysis on our build server. While it is possible to run locally as well, it is not built into
IntelliJ, which is what our team uses to develop all of our Scala codebases. Because it does not run whenever we compile, it is sometimes neglected to be run before checking in a change and developers, myself included, have to go back and make the appropriate changes.

To include this in the compile stage, we will take advantage of the sbt plugin:

// plugins.sbt
addSbtPlugin("com.sksamuel.scapegoat" %% "sbt-scapegoat" % "1.0.9")

Then, we will create a separate sbt file for scapegoat, enable the compiler plugin and then configure the scapegoat settings:

// scapegoat.sbt
addCompilerPlugin("com.sksamuel.scapegoat" % "scalac-scapegoat-plugin_2.12.10" % "1.4.0")

scapegoatVersion in ThisBuild := "1.3.11"

scapegoatDisabledInspections := Seq(
  "AsInstanceOf",
)

scalacOptions ++= Seq(
  "-P:scapegoat:dataDir:./target/scapegoat"
) ++ scapegoatDisabledInspections.value.map(x => s"-P:scapegoat:disabledInspections:$x" )

The examples above may not be the most up-to-date versions, but hopefully you get the gist. The second part about the disable inspections is also not required, but it a nice way to define the list in a 'nice' way using the sbt plugin and easily converting it to being using by the compiler plugin. The only required part is the -P:scapegoat:dataDir scalac option. Once you add this, you should see Scapegoat errors show up during both IntelliJ builds and when compiling through sbt.