IContributor marker interface.

src/main/kotlin/com/beust/kobalt/api/IClasspathContributor.kt

@@ -5,7 +5,7 @@ import com.beust.kobalt.maven.IClasspathDependency
 /**
  * Plugins that export classpath entries need to implement this interface.
  */
-interface IClasspathContributor {
+interface IClasspathContributor : IContributor {
     fun entriesFor(project: Project?) : Collection<IClasspathDependency>
 }
 

src/main/kotlin/com/beust/kobalt/api/IContributor.kt

@@ -0,0 +1,4 @@
+package com.beust.kobalt.api
+
+interface IContributor
+

src/main/kotlin/com/beust/kobalt/api/IInitContributor.kt

@@ -7,7 +7,7 @@ import java.io.OutputStream
  * Plugins that want to participate in the --init process (they can generate files to initialize
  * a new project).
  */
-interface IInitContributor {
+interface IInitContributor : IContributor {
     /**
      * How many files your plug-in understands in the given directory. The contributor with the
      * highest number will be asked to generate the build file.

src/main/kotlin/com/beust/kobalt/api/IProjectContributor.kt

@@ -3,7 +3,7 @@ package com.beust.kobalt.api
 /**
  * Plugins that create projects need to implement this interface.
  */
-interface IProjectContributor {
+interface IProjectContributor : IContributor {
     fun projects() : List<ProjectDescription>
 }
 

src/main/kotlin/com/beust/kobalt/api/IRepoContributor.kt

@@ -5,7 +5,7 @@ import java.net.URI
 /**
  * Plugins that add their own repos.
  */
-interface IRepoContributor {
+interface IRepoContributor : IContributor {
     fun reposFor(project: Project?) : List<URI>
 }