Example sbt build file for multi-module project

gistfile1.scala

import sbt._
import Keys._
import sbtassembly.Plugin._
import AssemblyKeys._
import sbt.Package.ManifestAttributes
import sbt.Logger
import com.typesafe.sbt.SbtAtmos.{Atmos, atmosSettings, AtmosKeys}

object HelloSbtBuild extends Build {

  //
  // Project Definitions
  //

  // // The root project that aggregates everything else
  lazy val rootprj = Project(
    id = "rootprj",
    base = file(".")
  ).settings(net.virtualvoid.sbt.graph.Plugin.graphSettings: _*) aggregate(module1, module2)

  lazy val module1 = Project(
    id = "module1",
    base = file("module1"),
    settings = baseSettings ++ Seq(
      libraryDependencies ++= module1Dependencies
    )
  ).settings(net.virtualvoid.sbt.graph.Plugin.graphSettings: _*)

  lazy val module2 = Project(
    id = "module2",
    base = file("module2"),
    settings = baseSettings ++ Seq(
      libraryDependencies ++= module2Dependencies
    )
  ).settings(net.virtualvoid.sbt.graph.Plugin.graphSettings: _*)
  
  val module1Dependencies = Seq(
    "org.twitter4j" % "twitter4j-core" % "3.0.3" intransitive(),
    "org.twitter4j" % "twitter4j-stream" % "3.0.3" intransitive(),
    "org.twitter4j" % "twitter4j-async" % "3.0.3" intransitive()
  )

  val module2Dependencies = Seq(
    // Facebook
    "com.restfb" % "restfb" % "1.6.9"
  )

  lazy val baseSettings = Defaults.defaultSettings ++ assemblySettings ++ Seq(
    conflictWarning := ConflictWarning.disable,
    resolvers := commonResolvers,
    retrieveManaged := true
  )

  val commonResolvers = Seq(
    "Cloudera Maven Repo" at "https://repository.cloudera.com/artifactory/cloudera-repos/",
    "sbt-idea-repo" at "http://mpeltonen.github.com/maven/",
    "ScalaNLP Maven2" at "http://repo.scalanlp.org/repo/",
    "repo.novus snaps" at "http://repo.novus.com/snapshots/",
    "repo.codahale.com" at "http://repo.codahale.com",
    "Sonatype OSS Releases" at "http://oss.sonatype.org/content/repositories/releases/",
    "Sonatype Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/",
    "Sonatype Releases" at "https://oss.sonatype.org/content/repositories/releases/",
    "spray repo" at "http://repo.spray.cc",
    "Akka Repo" at "http://repo.akka.io/releases",
    "clojars" at "http://clojars.org/repo/",
    "clojure-releases" at "http://build.clojure.org/releases",
    "twitter repo" at "http://maven.twttr.com"
  )

}