reactific / sbt-reactific Edit

A common sbt AutoPlugin for Reactific (and other) software

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This is an SBT plugin we use at Reactific Software LLC to pull together often used plugins for Scala based Reactific software projects. This plugin was developed in an effort to keep SBT incantations DRY (Don't Repeat Yourself) and reduce workload on starting new projects. Most of the projects Reactific develops are similar in nature and use a common set of plugins and options to manage them. To elimnate redundancy and errors, this plugin brings together the common plugins, provides sane defaults and makes some decisions about the structure of the project. Users can still override the settings but if you agree with the defaults then it is very simple to use.

sbt 1.0 targeted

The sbt-reactific plugin is targeted towards the 1.0 release of sbt. That is, it expects you to define your project in an build.sbt file at the top level of the project's directory structure. Currently, sbt-reactific is based on the 0.13.16 release of sbt using scala 2.10.6. When sbt 1.0 is released and all the plugins it depends on also support that release, sbt-reactific will be updated to meet all requirements of sbt 1.0. For example, it will at least move from using scala 2.10 to using scala 2.12. Other changes may be necessary as well, depending on sbt 1.0's requirements.

Using The Plugin

This package builds an sbt autoplugin. You use it like you would any autoplugin, by putting something like this in your project/plugins.sbt file:

addSbtPlugin("com.reactific" % "sbt-reactific" % "2.0.4" )

This should be resolvable on the Maven Central repository.

Plugins Enabled

When you include and enable the ReactificPlugin, you will enable a variety of other plugins too. That set of plugins may determine whether you want to use this plugin or not. For Reactific, these are all required. For other companies, you probably want to provide your own plugin that adjusts the options provided by this one to simplify build specification in your projects.

Here are the plugins enabled by sbt-reactific:

addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.5")
addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "2.0")
addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.0.1")
addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "0.9.3")
addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.7.0")
addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-site" % "1.2.1")
addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.2.0")
addSbtPlugin("de.heikoseeberger" % "sbt-header" % "2.0.0")
addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.5.1")
addSbtPlugin("org.scoverage" % "sbt-coveralls" % "1.1.0")

And those plugins endow your project with these features:

  • sbt-release: Run a release procedure to release your open source software
  • sbt-sonatype: Publish your project to sonatype repository with "release" command
  • sbt-git: Run git commands directly from sbt
  • sbt-pgp: Certification and signing support for publishing releases to Sonatype
  • sbt-buildinfo: Get the build time, date, version, build number and other details into your software
  • sbt-unidoc: Scala and Java documentation unification
  • sbt-compile-quick-plugin: Adds a quick compile (qc) command
  • sbt-license-report: Find out what licenses your project utilizes
  • sbt-site: Site generation for your project
  • sbt-native-packager: Packaging for various machines
  • sbt-header: Update file headers for open source licensing
  • sbt-scoverage: Scala test coverage support
  • sbt-coveralls: Report scala test coverage to coveralls

Additionally, sbt-reactific provides its own features:

  • Running arbitrary shell commands from sbt using the "sh" or "!" command aliases
  • Providing an sbt prompt that includes the release and git branch in it
  • Printing the run time, test time, and compile time class paths for diagnosing classpath issues
  • Apache 2.0 license header support for scala, java, properties, conf, and xml file suffixes

Configuring A One-Project Build

If your build has just one project, you should add something like the following into your build.sbt:

name := "my-project"
scalaVersion := "2.12.2"
organization := ""
copyrightHolder := "My Company, Inc."
startYear  := Some(2015)
developerUrl := url("")
titleForDocs := "Company Project"
codePackage := ""

Configuring a Multi-Project Build

If you want to have multiple subprojects in your build then do something like this instead:

val commonSettings = Seq(
  copyrightHolder := "My Company, Inc.",
  startYear  := Some(2015),
  developerUrl := url(""),
  titleForDocs := "Documentation For Project At Company",
  codePackage := ""

lazy val p1 = (project in file("p1"))
lazy val p2 = (project in file("p2"))

Configuration Keys Provided By sbt-reactific

Several keys are defined by the sbt-reactific project for convenience.

codePackage (String)

This should be set to the main, top level Scala package name that contains all of the project's code. This is used in several places with the plugins.

titleForDocs (String)

This is the title that should be used for the project's generated Java and Scala documentation.

copyrightHolder (String)

This is the legal name of the entity or person that holds the copyright for the software. This is used in the license header for the software, and in the documentation. This is separate from the sbt provided organization setting.

developerUrl (URL)

This should be set to an URL that refers to the developer's home page.

publishSnapshotsTo (Resolver)

This should be set to the URL where snapshot versions are published to. The default for this points to Reactific's repository on and since you won't know the password for it, you'll need to set this to the repository where your snapshots ought to be published.

publishReleasesTo (Rsolver)

This should be set to the URL where release versions are published to. The default for this points to Reactific's repository on and since you won't know the password for it, you'll need to set this to the repository where your release ought to be published.

warningsAreErrors (Boolean)

Here at Reactific we don't like warnings in our software so we have this key defaulted to true. It causes all Scala and Java warnings to be treated as errors by the compiler. In other words, it will be impossible to build or release software that have any warnings in it. This has helped to produce higher quality software as many warnings are actually bugs waiting to happen.

checkScalaStyle (Boolean)

When this flag is true, the scalastyle task will be run during the release process to check the source code for style issues. Default is true.

checkHeaders (Boolean)

When this flag is true, the headerCheck task will be run during the release process to check that all source files have correct headers. Default is true.

checkTests (Boolean)

When this flag is true, the test task will be run during the release process to check that all tests pass. Default is true.

runScalafmtWhenReleases (Boolean)

When this flag is true, the scalafmt task will be run during the release process to reformat code to the standard form. Any changes will be checked in with the version checkin. Default is false.

additionalCheckSteps (Seq[ReleaseStep])

Additional steps to add to the release process to check the artifact's correctness. These steps should generate errors if the checks fail and should not modify the code in any way.

Prompt Style

The sbt-reactific plugin changes the sbt plugin to contain useful information. For example, one of the test cases produces this prompt:

hello-test(simple) : master...origin/master : 0.1.2-SNAPSHOT>
  • hello-test is the name of the project as specified in the build.sbt
  • simple is the name of the root project
  • master...origin/master is the git branch your project is using
  • 0.1.2-SNAPSHOT is the version you're currently building towards

This helps to make sure you know where you are when you're building or releasing the software.

Commands & Aliases

The sbt-reactific plugin adds various commands and command aliases that you can use from the sbt prompt. We find these to be handy.


Run any git command from within sbt. This allows you to manipulate the git repository without leaving sbt.

hello-test(simple) : master...origin/master : 0.1.2-SNAPSHOT>git version
[info] git version 2.12.2
hello-test(simple) : master...origin/master : 0.1.2-SNAPSHOT>


Run any shell command from within sbt. This allows you to get information from the shell without leaving sbt. For example:

hello-test(simple) : master...origin/master : 0.1.2-SNAPSHOT>sh ls


Prints the project's classpath

hello-test(simple) : master...origin/master : 0.1.2-SNAPSHOT>printClassPath
[info] Compiling 1 Scala source to /Users/reid/Code/sbt-reactific/src/sbt-test/sbt-project/simple/target/scala-2.11/classes...
----- Compile: /Users/reid/Code/sbt-reactific/src/sbt-test/sbt-project/simple/target: FILES:
----- /Users/reid/Code/sbt-reactific/src/sbt-test/sbt-project/simple/target: All Binary Dependencies:
----- END
[success] Total time: 1 s, completed Aug 5, 2017 1:36:40 PM


Similar to printClassPath but prints the testing class path.


Similar to printClassPath but prints the runtime class path.


An alias for test-quick to re-test only failing test cases


An alias for test-only to test specific SPEC tests


An alias for compile-quick (currently not implemented)


An alias for compile because it gets mis-typed by this author so much.


An alias for test because it gets mis-typed by this author so much.


An alias for ; clean ; test


An alias for test:compile to compile the test code and its dependencies


An alias for ; clean ; test:compile to do a clean recompilation of the test code.


An alias for ; lean ; coverage ; test ; coverageAggregate ; reload which is a sequence of commands needed for getting coverage data.