How can one change the location of the "webapp" directory for a Scalatra application?

By default, Scalatra expects the "webapp" directory to be at src/main/webapp. How could that be changed to, e.g., content/doc-root?

sbt allows for customizing its default directories using something like the following:

scalaSource <<= (baseDirectory)(_ / "src")

So I assume it's just a matter of knowing the right "configuration key" to use...

@Kelsey Gilmore-Innis has the right answer, but since it's not accepted let's break it, break it, break it down.

First, I'm assuming you're following Getting started guide to install Scalatra using g8. Hopefully the same version I just got.

g8 scalatra/scalatra-sbt

What that g8 template did was to set up an sbt 0.13 build which uses scalatra-sbt 0.3.2 plugin:

addSbtPlugin("org.scalatra.sbt" % "scalatra-sbt" % "0.3.2")

This plugin internally uses JamesEarlDouglas/xsbt-web-plugin 0.4.0 to do the webapp-related settings.

xsbt-web-plugin 0.4.0

This is why xsbt-web-plugin becomes relevant even though you just want to change Scalatra's setting. The setting you need to rewire is called webappResources in Compile. How does that work?

rewiring webappResources

To rewire the setting, open project/build.scala. Add

import com.earldouglas.xsbtwebplugin.PluginKeys.webappResources

to the import clauses. Then change settings as follows:

  lazy val project = Project (
    "foo",
    file("."),
    settings = Defaults.defaultSettings ++ ScalatraPlugin.scalatraWithJRebel ++ scalateSettings ++ Seq(
      organization := Organization,
      name := Name,
      version := Version,
      scalaVersion := ScalaVersion,
      resolvers += Classpaths.typesafeReleases,
      webappResources in Compile := Seq(baseDirectory.value / "content" / "doc-root"),
      ...
    )
  )

Now move src/main/webapp to content/doc-root, reload sbt, and that should be it.