only provide `dependencyGraph` / `asciiGraph` in sbt 0.13

build.sbt

@@ -1,8 +1,13 @@
 ScriptedPlugin.scriptedSettings
 
-libraryDependencies += "com.github.mdr" %% "ascii-graphs" % "0.0.3"
+libraryDependencies ++= {
+  if (sbtVersion.value startsWith "0.13")
+    Seq("com.github.mdr" %% "ascii-graphs" % "0.0.3")
+  else
+    Nil
+}
 
-libraryDependencies += "org.specs2" %% "specs2" % "2.3.11" % "test"
+libraryDependencies += "org.specs2" %% "specs2-core" % "3.9.1" % "test"
 
 scalacOptions ++= Seq("-deprecation", "-unchecked")
 

src/main/scala-sbt-0.13/net/virtualvoid/sbt/graph/rendering/AsciiGraph.scala

@@ -18,6 +18,8 @@ package net.virtualvoid.sbt.graph
 package rendering
 
 import com.github.mdr.ascii.layout._
+import net.virtualvoid.sbt.graph.DependencyGraphKeys._
+import sbt.Keys._
 
 object AsciiGraph {
   def asciiGraph(graph: ModuleGraph): String =
@@ -35,4 +37,24 @@ object AsciiGraph {
     val edges = moduleGraph.edges.toList.map { case (from, to) ⇒ (renderVertex(moduleGraph.module(from)), renderVertex(moduleGraph.module(to))) }
     Graph(vertices, edges)
   }
+
+  def asciiGraphSetttings = Seq[sbt.Def.Setting[_]](
+    DependencyGraphKeys.asciiGraph := asciiGraph(moduleGraph.value),
+    dependencyGraph := {
+      val force = DependencyGraphSettings.shouldForceParser.parsed
+      val log = streams.value.log
+      if (force || moduleGraph.value.nodes.size < 15) {
+        log.info(rendering.AsciiGraph.asciiGraph(moduleGraph.value))
+        log.info("\n\n")
+        log.info("Note: The old tree layout is still available by using `dependency-tree`")
+      }
+
+      log.info(rendering.AsciiTree.asciiTree(moduleGraph.value))
+
+      if (!force) {
+        log.info("\n")
+        log.info("Note: The graph was estimated to be too big to display (> 15 nodes). Use `sbt 'dependency-graph --force'` (with the single quotes) to force graph display.")
+      }
+    }
+  )
 }

src/main/scala-sbt-1.0/net/virtualvoid/sbt/graph/rendering/AsciiGraph.scala

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2017 Johannes Rudolph
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package net.virtualvoid.sbt.graph
+package rendering
+
+object AsciiGraph {
+  def asciiGraphSetttings = Seq.empty[sbt.Def.Setting[_]]
+}

src/main/scala/net/virtualvoid/sbt/graph/DependencyGraphSettings.scala

@@ -18,15 +18,11 @@ package net.virtualvoid.sbt.graph
 
 import sbt._
 import Keys._
-
 import CrossVersion._
-
 import sbt.complete.Parser
-
 import org.apache.ivy.core.resolve.ResolveOptions
-
 import net.virtualvoid.sbt.graph.backend.{ IvyReport, SbtUpdateReport }
-import net.virtualvoid.sbt.graph.rendering.DagreHTML
+import net.virtualvoid.sbt.graph.rendering.{ AsciiGraph, DagreHTML }
 import net.virtualvoid.sbt.graph.util.IOUtil
 
 object DependencyGraphSettings {
@@ -55,23 +51,6 @@ object DependencyGraphSettings {
       else graph
     },
     moduleGraphStore <<= moduleGraph storeAs moduleGraphStore triggeredBy moduleGraph,
-    asciiGraph <<= moduleGraph map rendering.AsciiGraph.asciiGraph,
-    dependencyGraph <<= InputTask(shouldForceParser) { force ⇒
-      (force, moduleGraph, streams) map { (force, graph, streams) ⇒
-        if (force || graph.nodes.size < 15) {
-          streams.log.info(rendering.AsciiGraph.asciiGraph(graph))
-          streams.log.info("\n\n")
-          streams.log.info("Note: The old tree layout is still available by using `dependency-tree`")
-        } else {
-          streams.log.info(rendering.AsciiTree.asciiTree(graph))
-
-          if (!force) {
-            streams.log.info("\n")
-            streams.log.info("Note: The graph was estimated to be too big to display (> 15 nodes). Use `sbt 'dependency-graph --force'` (with the single quotes) to force graph display.")
-          }
-        }
-      }
-    },
     asciiTree <<= moduleGraph map rendering.AsciiTree.asciiTree,
     dependencyTree <<= print(asciiTree),
     dependencyGraphMLFile <<= target / "dependencies-%s.graphml".format(config.toString),
@@ -101,7 +80,7 @@ object DependencyGraphSettings {
         streams.log.info(rendering.AsciiTree.asciiTree(GraphTransformations.reverseGraphStartingAt(graph, module)))
       }
     },
-    licenseInfo <<= (moduleGraph, streams) map showLicenseInfo))
+    licenseInfo <<= (moduleGraph, streams) map showLicenseInfo) ++ AsciiGraph.asciiGraphSetttings)
 
   def ivyReportFunctionTask =
     (sbtVersion, target, projectID, ivyModule, appConfiguration, streams) map { (sbtV, target, projectID, ivyModule, config, streams) ⇒