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sbt / sbt-assembly

Deploy über-JARs. Restart processes. (port of codahale/assembly-sbt)
MIT License
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A way to disable Assembly by default #381

Closed pjrt closed 5 years ago

pjrt commented 5 years ago

We have a multiple-project project where we use assembly for building fat jars. Now of course, we only build fat jars for projects which can be ran (executables), as making a fat jar for a library project wouldn't make sense.

However, I realized that because the Assembly plugin requires the JvmPlugin, it is added to ALL projects.

https://github.com/sbt/sbt-assembly/blob/master/src/main/scala/sbtassembly/AssemblyPlugin.scala#L7

I am aware of disablePlugins, but since we have way more library projects than we have executable projects, we would like to do the opposite: to have the plugin ONLY enabled on projects we deem need it.

Is there a way to do this?

pjrt commented 5 years ago

I closed my PR since it would require a major change. If anyone wants a pretty simple work around, simply add this plugin to your project. 

import sbtassembly._

object OnDemandAssemblyPlugin extends AutoPlugin {
  override def requires = AssemblyPlugin
  override def trigger = noTrigger

  import autoImport._
  import AssemblyKeys._

  override def projectSettings =
    Seq(
      onDemandAssembly := assembly.value
    )

  object autoImport {
    val onDemandAssembly = taskKey[File]("An on-demand assembly")
  }
}