sbt 0.13.8 added
Def.sequential function to run tasks under semi-sequential semantics.
To demonstrate the sequential task, let’s create a custom task called
compilecheck that runs
compile in Compile and then
scalastyle in Compile task added by scalastyle-sbt-plugin.
Here’s how to set it up
addSbtPlugin("org.scalastyle" %% "scalastyle-sbt-plugin" % "0.8.0")
lazy val compilecheck = taskKey[Unit]("compile and then scalastyle") lazy val root = (project in file(".")). settings( compilecheck in Compile := Def.sequential( compile in Compile, (scalastyle in Compile).toTask("") ).value )
To call this task type in
compilecheck from the shell. If the compilation fails,
compilecheck would stop the execution.
root> compilecheck [info] Compiling 1 Scala source to /Users/x/proj/target/scala-2.10/classes... [error] /Users/x/proj/src/main/scala/Foo.scala:3: Unmatched closing brace '}' ignored here [error] } [error] ^ [error] one error found [error] (compile:compileIncremental) Compilation failed
Looks like we were able to sequence these tasks.