Add "update" and "checkVersions" as tasks.

modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/api/KobaltContext.kt

@@ -21,6 +21,8 @@ class KobaltContext(val args: Args) {
 
     fun findPlugin(name: String) = Plugins.findPlugin(name)
 
+    val allProjects = arrayListOf<Project>()
+
     /** For internal use only */
     val internalContext = InternalContext()
 

src/main/kotlin/com/beust/kobalt/Main.kt

@@ -235,6 +235,7 @@ private class Main @Inject constructor(
         }
 
         val allProjects = findProjectResult.projects
+        findProjectResult.context.allProjects.addAll(allProjects)
 
         //
         // Now that we have projects, add all the repos from repo contributors that need a Project

src/main/kotlin/com/beust/kobalt/app/BuildFileCompiler.kt

@@ -42,6 +42,7 @@ public class BuildFileCompiler @Inject constructor(@Assisted("buildFiles") val b
     fun compileBuildFiles(args: Args): FindProjectResult {
         //
         // Create the KobaltContext
+        // Note: can't use apply{} here or each field will refer to itself instead of the constructor field
         //
         val context = KobaltContext(args)
         context.pluginInfo = pluginInfo
@@ -61,7 +62,7 @@ public class BuildFileCompiler @Inject constructor(@Assisted("buildFiles") val b
 
     val parsedBuildFiles = arrayListOf<ParsedBuildFile>()
 
-    class FindProjectResult(val projects: List<Project>, val pluginUrls: List<URL>,
+    class FindProjectResult(val context: KobaltContext, val projects: List<Project>, val pluginUrls: List<URL>,
             val taskResult: TaskResult)
 
     private fun findProjects(context: KobaltContext): FindProjectResult {
@@ -107,7 +108,8 @@ public class BuildFileCompiler @Inject constructor(@Assisted("buildFiles") val b
 
         }
         val pluginUrls = parsedBuildFiles.flatMap { it.pluginUrls }
-        return FindProjectResult(projects, pluginUrls, if (errorTaskResult != null) errorTaskResult!! else TaskResult())
+        return FindProjectResult(context, projects, pluginUrls,
+                if (errorTaskResult != null) errorTaskResult!! else TaskResult())
     }
 
     private fun maybeCompileBuildFile(context: KobaltContext, buildFile: BuildFile, buildScriptJarFile: File,

src/main/kotlin/com/beust/kobalt/plugin/KobaltPlugin.kt

@@ -1,16 +1,37 @@
 package com.beust.kobalt.plugin
 
+import com.beust.kobalt.TaskResult
 import com.beust.kobalt.api.BasePlugin
+import com.beust.kobalt.api.Project
+import com.beust.kobalt.api.annotation.Task
+import com.beust.kobalt.app.UpdateKobalt
+import com.beust.kobalt.misc.CheckVersions
+import com.google.inject.Inject
 import javax.inject.Singleton
 
 /**
  * This plugin is used to gather tasks defined in build files, since these tasks don't really belong to any plugin.
  */
 @Singleton
-public class KobaltPlugin : BasePlugin() {
+class KobaltPlugin @Inject constructor(val checkVersions: CheckVersions, val updateKobalt: UpdateKobalt)
+        : BasePlugin () {
+
     companion object {
-        public val PLUGIN_NAME = "Kobalt"
+        val PLUGIN_NAME = "Kobalt"
     }
 
     override val name: String get() = PLUGIN_NAME
+
+    @Task(name = "checkVersions", description = "Display all the outdated dependencies")
+    fun taskCheckVersions(project: Project) : TaskResult {
+        checkVersions.run(context.allProjects)
+        return TaskResult()
+    }
+
+    @Task(name = "update", description = "Update Kobalt to the latest version")
+    fun taskUpdate(project: Project) : TaskResult {
+        updateKobalt.updateKobalt()
+        return TaskResult()
+    }
+
 }