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I know this because build.sbt knows this.

branch: master
README.markdown

sbt-buildinfo

I know this because build.sbt knows this.

sbt-buildinfo generates Scala source from your build definitions.

Latest Stable

addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.3.1")

For sbt 0.12, see 0.2.5.

Usage

Add the following in your build.sbt:

buildInfoSettings

sourceGenerators in Compile <+= buildInfo

buildInfoKeys := Seq[BuildInfoKey](name, version, scalaVersion, sbtVersion)

buildInfoPackage := "hello"

(Note: in version 0.1.2, this was Seq[Scoped] instead!)

Alternatively, if you are using Build.scala, add the import import sbtbuildinfo.Plugin._ to it and add the module's setting through something like:

lazy val myProject = Project(
    id = "myProjectName",
    base = file("."),
    settings = Defaults.defaultSettings ++
      buildInfoSettings ++
      Seq(
          sourceGenerators in Compile <+= buildInfo,
          buildInfoKeys := Seq[BuildInfoKey](name, version, scalaVersion),
          buildInfoPackage := "org.myorg.myapp"
      ) ++
      
)

When you reload the settings and compile, this generates the following:

package hello

case object BuildInfo {
  val name = "helloworld"
  val version = "0.1-SNAPSHOT"
  val scalaVersion = "2.9.2"
  val sbtVersion = "0.12.0"
}

Customize buildInfoKeys by adding whatever keys. You can use BuildInfoKey.map to change the generated field name and value, add new fields with tuples, or add new fields with values computed at build-time:

buildInfoKeys ++= Seq[BuildInfoKey](
  resolvers,
  libraryDependencies in Test,
  BuildInfoKey.map(name) { case (k, v) => "project" + k.capitalize -> v.capitalize },
  "custom" -> 1234, // computed at project load time
  BuildInfoKey.action("buildTime") {
    System.currentTimeMillis
  } // re-computed each time at compile
)

This generates:

  val resolvers = Seq("Sonatype Public: https://oss.sonatype.org/content/groups/public")
  val test_libraryDependencies = Seq("org.scala-lang:scala-library:2.9.1", ...)
  val projectName = "Helloworld"
  val custom = 1234
  val buildTime = 1346906092160L

Tasks can be added only if they do not depend on sourceGenerators. Otherwise, it will cause an infinite loop.

Here's how to change the generated the object name:

buildInfoObject := "Info"

This changes the generated object to object Info. Changing the object name is optional, but to avoid name clash with other jars, package name should be unique.

build number

A build number can be generated as follows. Note that cross building against multiple Scala would each generate a new number.

buildInfoKeys += buildInfoBuildNumber

Eclipse support

If you use the sbteclipse plugin to generate projects for Eclipse, you need to tell sbteclipse that the generated BuildInfo.scala is a managed source, i.e., a generated source file.

To do so, you can configure sbteclipse as follows:

EclipseKeys.createSrc := EclipseCreateSrc.Default + EclipseCreateSrc.Managed

This is explained in more detail in the sbtecliipse documentation.

License

MIT License

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