Cross Publishing of SBT Plugins not working - scala

Question

My objective is to write an SBT plugin which can be used by SBT 0.13.x and 1.x versions of SBT. Based on this thread and this documentation. I wrote the following build.sbt for my plugin project
lazy val foo = (project in file(".")).settings(
name := "foo",
sbtPlugin := true,
organization := "com.bar",
version := "1.0.0",
scalaVersion:= "2.12.4",
sbtVersion in Global := "1.0.0",
crossSbtVersions := Seq("0.13.17", "1.0.0"),
libraryDependencies ++= Seq(
"com.typesafe" % "config" % "1.3.3"
),
scalaCompilerBridgeSource := {
val sv = appConfiguration.value.provider.id.version
("org.scala-sbt" % "compiler-interface" % sv % "component").sources
}
)
when I do sbt +publichLocal I see
info] Packaging /Users/user1/IdeaProjects/fulfillment-sbt/target/scala-2.12/sbt-0.13/foo-1.0.0-javadoc.jar ...
[info] Done packaging.
[info] published foo to /Users/user1/.ivy2/local/com.bar/foo/scala_2.12/sbt_0.13/1.0.0/poms/foo.pom
[info] published foo to /Users/user1/.ivy2/local/com.bar/foo/scala_2.12/sbt_0.13/1.0.0/jars/foo.jar
[info] published foo to /Users/user1/.ivy2/local/com.bar/foo/scala_2.12/sbt_0.13/1.0.0/srcs/foo-sources.jar
[info] published foo to /Users/user1/.ivy2/local/com.bar/foo/scala_2.12/sbt_0.13/1.0.0/docs/foo-javadoc.jar
[info] published ivy to /Users/user1/.ivy2/local/com.bar/foo/scala_2.12/sbt_0.13/1.0.0/ivys/ivy.xml
[success] Total time: 9 s, completed Apr 4, 2018 11:12:38 AM
But it didn't publish for 1.0 version of SBT. what can I do that it publishes for both versions of SBT?

Answer 1

I went to the gitter channel of SBT and had a conversation there with the creators of SBT. Based on that conversation I created a working example. I am listing it here so that it helps someone cross publish sbt plugins in future.
project/build.properties
sbt.version=0.13.17
build.sbt
lazy val p = (project in file(".")).settings(
name := "sbt-crosspublish",
sbtPlugin := true,
organization := "com.abhi",
version := "1.0.0",
crossScalaVersions := Seq("2.10.6", "2.12.0"),
crossSbtVersions := Seq("0.13.17", "1.0.0"),
libraryDependencies ++= Seq(
"com.typesafe" % "config" % "1.3.3"
),
scalaCompilerBridgeSource := {
val sv = appConfiguration.value.provider.id.version
("org.scala-sbt" % "compiler-interface" % sv % "component").sources
}
)
And finally in order to cross publish SBT plugins one has to do
sbt ^publishLocal
Wow. didn't know about the ^ the sbt +publishLocal is for cross publishing normal binaries not for plugins. for cross publishing of sbt plugins, we must do sbt ^publishLocal.
One thing to note is that the scalaCompilerBridgeSource thing is only needed if you are working on SBT 0.13.17. If you upgrade to SBT 1.1.0 in the plugin project then the code is simplified.
project/build.properties
sbt.version=1.1.2
build.sbt
lazy val p = (project in file(".")).settings(
name := "sbt-crosspublish",
sbtPlugin := true,
organization := "com.abhi",
version := "1.0.0",
crossScalaVersions := Seq("2.10.6", "2.12.0"),
crossSbtVersions := Seq("0.13.17", "1.0.0"),
libraryDependencies ++= Seq(
"com.typesafe" % "config" % "1.3.3"
)
)