Gatling SBT Plugin

GatlingPlugin.scala

import sbt._
import Keys._

object GatlingPlugin {
  val gatling = TaskKey[Unit]("gatling")

  val gatlingVersion = SettingKey[String]("gatling-version")
  val gatlingResultsDirectory = SettingKey[String]("gatling-results-directory")
  val gatlingDataDirectory = SettingKey[String]("gatling-data-directory")
  val gatlingConfigFile = SettingKey[String]("gatling-config-file")

  lazy val gatlingSettings = Seq(
    gatlingVersion := "1.1.1",
    fullClasspath in gatling <<= fullClasspath or (fullClasspath in Runtime),
    gatlingResultsDirectory <<= target(_.getAbsolutePath + "/gatling-results"),
    gatlingDataDirectory <<= (resourceDirectory in Compile).apply(_.getAbsolutePath),
    gatlingConfigFile <<= (resourceDirectory in Compile).apply(_.getAbsolutePath + "/gatling.conf"),

    libraryDependencies <+= (gatlingVersion) { gv =>
      "com.excilys.ebi.gatling.highcharts" % "gatling-charts-highcharts" % gv
    },

    gatling <<= (streams, gatlingResultsDirectory, gatlingDataDirectory, gatlingConfigFile, fullClasspath in gatling, classDirectory in Compile, runner in run)
        map { (s, grd, gdd, gcf, cp, cd, runner) => {
          val args = Array("--results-folder", grd,
                        "--data-folder", gdd,
                        "--config-file", gcf,
                        "--simulations-binaries-folder", cd.absolutePath)

          toError(runner.run("com.excilys.ebi.gatling.app.Gatling", Build.data(cp), args, s.log))
        }
    }
  )
}

Are you sure you need to explicitly depend on gatling-app and gatling-http as gatling-charts-highcharts depends on them with compile scope?

No, you're probably right. I started off with just http, then added app and highcharts as required, but I can just use highcharts if transitive deps will take care of the rest.