sbt-build-info

build.sbt

sbtPlugin := true

name := "sbt-build-info"

organization := "com.tapad"

version := "0.1.3"

credentials += Credentials(Path.userHome / ".ivy2" / ".credentials")

val tapadNexusSnapshots = "Tapad Nexus Snapshots" at "http://nexus.tapad.com:8080/nexus/content/repositories/snapshots"

val tapadNexusReleases = "Tapad Nexus Releases" at "http://nexus.tapad.com:8080/nexus/content/repositories/releases"

publishTo <<= (version) { version: String =>
  if (version.endsWith("SNAPSHOT") || version.endsWith("TAPAD"))
    Some(tapadNexusSnapshots)
  else
    Some(tapadNexusReleases)
}

publishMavenStyle := true

scalaVersion := "2.10.4"

project_build.properties

sbt.version=0.13.5

src_main_scala_BuildInfoPlugin.scala

package sbtbuildinfo

import java.io.File

import sbt._
import Keys._

object BuildInfoPlugin extends Plugin {

  lazy val buildInfo = TaskKey[Seq[File]]("build-info", "Generate a resource which contains build information.")

  object BuildInfoKeys {

    lazy val buildInfoFileName = TaskKey[String]("build-info-filename")

    lazy val buildInfoDefaultFileName = TaskKey[String]("build-info-default-filename")

    lazy val buildInfoProps = TaskKey[Map[String, String]]("build-info-props")
  }

  import BuildInfoKeys._

  lazy val buildInfoSettings: Seq[sbt.Def.Setting[_]] = Seq(
    buildInfo := buildInfoGeneratorTask(buildInfo).value,
    buildInfoDefaultFileName in buildInfo := "build-info.properties",
    buildInfoFileName in buildInfo <<= (buildInfoFileName in buildInfo) or (buildInfoDefaultFileName in buildInfo),
    buildInfoProps in buildInfo := generateGitProps,
    resourceGenerators in Compile += buildInfoGeneratorTask(buildInfo).taskValue
  )

  private def buildInfoGeneratorTask(key: TaskKey[Seq[File]]): Def.Initialize[Task[Seq[File]]] = Def.task {
    val log = (streams in key).value.log
    log.info(s"Generating build-info (triggered by resource generator)")
    val name = (buildInfoFileName in key).value
    val file = (resourceManaged in Compile).value / name
    val props = (buildInfoProps in key).value
    val contents = props.map { case (k, v) => s"$k=$v" }.mkString("\n")
    log.debug(s"$contents")
    IO.write(file, contents)
    Seq(file)
  }

  private def generateGitProps(): Map[String, String] = Map(
    "git.commit.sha" -> Process("git rev-parse HEAD").lines.head
  )
}