Add workspace plugin

3 files changed, 52 insertions, 8 deletions

diff --git a/README.md b/README.md
index 5406e8d..1900e81 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ activated out-of-the-box.
 | LibraryPlugin            | manual                                 |
 | ServicePlugin            | manual                                 |
 | IntegrationTestPackaging | automatic, if ServicePlugin is enabled |
+| WorkspacePlugin          | automatic                              |
 
 ### Lint Plugin
 
@@ -46,13 +47,6 @@ activated out-of-the-box.
 This plugin can get in the way of developer productivity. If that is
 the case, it can simply be disabled.
 
-### Integration Test Packaging
-
-*[source](src/main/scala/xyz.driver.sbt/IntegrationTestPackaging.scala)*
-
-Augments the packaging configuration of ServicePlugin, to include
-integration tests in deployed applications images.
-
 ### Library Plugin
 
 *[source](src/main/scala/xyz.driver.sbt/LibraryPlugin.scala)*
@@ -73,6 +67,22 @@ It also includes some utility commands such as `start` and `stop`
 (based on [sbt-revolver](https://github.com/spray/sbt-revolver), to
 enable rapid local development cycles of applications.
 
+### Integration Test Packaging
+
+*[source](src/main/scala/xyz.driver.sbt/IntegrationTestPackaging.scala)*
+
+Augments the packaging configuration of ServicePlugin, to include
+integration tests in deployed applications images.
+
+### Workspace Plugin
+
+*[source](src/main/scala/xyz.driver.sbt/WorkspacePlugin.scala)*
+
+Adds a `dependsOn` extension method to projects, that allows depending
+on both source and binary versions of a project. It is similar to
+sbt-sriracha and is intended to increase productivity in multi-project
+workflows.
+
 ## Canonical Use Case
 sbt-settings provides many plugins, which may be used in various
 ways. Typically however, a project is either a Library or a Service,
@@ -89,6 +99,9 @@ lazy val myservice = project
   .enablePlugin(ServicePlugin)
   .disablePlugins(IntegrationTestPackaging) // we don't need integration tests
   .disablePlugins(LintPlugin) // I don't need style check during development!
+  // use published artifact by default, and ../domain-model if SBT_WORKSPACE
+  // is defined as ..
+  .dependsOn("xyz.driver" %% "domain-model" % "1.2.3", "domain-model")
   .settings( /* custom settings */)
 ```
 
diff --git a/build.sbt b/build.sbt
index ae42a23..60a922c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,7 +10,6 @@ addSbtPlugin("io.spray"          %% "sbt-revolver"        % "0.9.1")
 addSbtPlugin("com.eed3si9n"      %% "sbt-buildinfo"       % "0.9.0")
 addSbtPlugin("com.typesafe.sbt"  %% "sbt-git"             % "1.0.0")
 addSbtPlugin("com.typesafe.sbt"  %% "sbt-native-packager" % "1.3.6")
-addSbtPlugin("com.github.gseitz" %% "sbt-release"         % "1.0.8")
 
 // the following prevents thousands of meaningless stacktraces by docker plugin on JDK 9
 libraryDependencies += "javax.activation" % "activation" % "1.1.1" % Test
diff --git a/src/main/scala/xyz.driver.sbt/WorkspacePlugin.scala b/src/main/scala/xyz.driver.sbt/WorkspacePlugin.scala
new file mode 100644
index 0000000..9a66eb7
--- /dev/null
+++ b/src/main/scala/xyz.driver.sbt/WorkspacePlugin.scala
@@ -0,0 +1,32 @@
+package xyz.driver.sbt
+
+import java.nio.file.{Path, Paths}
+
+import sbt._
+
+/** Enables using both source and binary dependencies for the same module,
+  * for faster development cycles in multi-project workflows.
+  * Adapted from https://github.com/sbt/sbt-sriracha. */
+object WorkspacePlugin extends AutoPlugin {
+
+  private var _workspace = sys.props.get("sbt.workspace").orElse(sys.env.get("SBT_WORKSPACE")).map { base =>
+    Paths.get(base)
+  }
+  def workspace: Option[Path] = synchronized(_workspace)
+
+  override val requires = plugins.JvmPlugin
+  override val trigger  = allRequirements
+
+  object autoImport {
+    implicit class WorkspaceProject(project: Project) {
+      def dependsOn(binary: ModuleID, projectName: String, directory: Option[String] = None): Project =
+        WorkspacePlugin.workspace match {
+          case Some(base) =>
+            project.dependsOn(
+              ProjectRef(base.resolve(directory.getOrElse(projectName)).toUri, projectName)
+            )
+          case None => project.settings(Keys.libraryDependencies += binary)
+        }
+    }
+  }
+}