fix #32: provide Graph for all sbt versions and don't rely on jline terminal width being > 0

notes/0.7.4.markdown

@@ -0,0 +1 @@
+This is a maintenance release fixing an exception when generating graphs without a terminal [#32](https://github.com/jrudolph/sbt-dependency-graph/issues/32).

src/main/scala-sbt-0.11/sbt/SbtDependencyGraphCompat.scala

@@ -1,11 +1,9 @@
-package net.virtualvoid.sbt.graph
+package sbt
 
-import sbt._
+import net.virtualvoid.sbt.graph.Plugin._
 import Keys._
 
-import Plugin.ignoreMissingUpdate
-
-object Compat {
+object SbtDependencyGraphCompat {
   /**
    * This is copied directly from sbt/main/Defaults.java and then changed to update the UpdateConfiguration
    * to ignore missing artifacts.
@@ -20,4 +18,6 @@ object Compat {
 
   import complete.DefaultParsers._
   lazy val StringBasic = NotSpaceClass.*.string
-}
+
+  def getTerminalWidth: Int = jline.Terminal.getTerminal.getTerminalWidth
+}

src/main/scala-sbt-0.12/sbt/SbtDependencyGraphCompat.scala

@@ -1,11 +1,9 @@
-package net.virtualvoid.sbt.graph
+package sbt
 
-import sbt._
+import net.virtualvoid.sbt.graph.Plugin._
 import Keys._
 
-import Plugin.ignoreMissingUpdate
-
-object Compat {
+object SbtDependencyGraphCompat {
   /**
    * This is copied directly from sbt/main/Defaults.java and then changed to update the UpdateConfiguration
    * to ignore missing artifacts.
@@ -19,4 +17,6 @@ object Compat {
 
 				Classpaths.cachedUpdate(cacheDirectory / "update", Project.display(ref), module, missingOkConfig, Some(si), skip = skip, force = isRoot, depsUpdated = depsUpdated, log = s.log)
 		} tag(Tags.Update, Tags.Network)
-}
+
+  def getTerminalWidth: Int = JLine.usingTerminal(_.getTerminalWidth)
+}

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

@@ -3,7 +3,9 @@
  *
  * Copied from sbt 0.12 source code
  */
-package sbt
+package net.virtualvoid.sbt.graph
+
+import sbt.SbtDependencyGraphCompat
 
 object Graph
 {
@@ -12,8 +14,10 @@ object Graph
 	// [info]   | +-baz
 	// [info]   |
 	// [info]   +-quux
-	def toAscii[A](top: A, children: A => Seq[A], display: A => String): String = {
-		val maxColumn = jline.Terminal.getTerminal.getTerminalWidth - 8
+	def toAscii[A](top: A,
+                 children: A => Seq[A],
+                 display: A => String,
+                 maxColumn: Int = defaultColumnSize): String = {
 		val twoSpaces = " " + " " // prevent accidentally being converted into a tab
 		def limitLine(s: String): String =
 			if (s.length > maxColumn) s.slice(0, maxColumn - 2) + ".."
@@ -40,4 +44,10 @@ object Graph
 
 		toAsciiLines(top, 0).mkString("\n")
 	}
+
+  def defaultColumnSize: Int = {
+    val termWidth = SbtDependencyGraphCompat.getTerminalWidth
+    if (termWidth > 20) termWidth - 8
+    else 80 // ignore termWidth
+  }
 }

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

@@ -21,7 +21,7 @@ import java.io.File
 import collection.mutable.HashMap
 import collection.mutable.MultiMap
 import collection.mutable.{Set => MSet}
-import sbt.{ConsoleLogger, Graph}
+import sbt.ConsoleLogger
 import xml.{NodeSeq, Document, XML, Node}
 import com.github.mdr.ascii.layout
 import layout._

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

@@ -79,7 +79,7 @@ object Plugin extends sbt.Plugin {
           (c: String) => file("%s/cache/%s-%s-%s.xml" format (home, projectID.organization, crossName(ivyModule), c))
       }
     },
-    Compat.ignoreMissingUpdateT,
+    SbtDependencyGraphCompat.ignoreMissingUpdateT,
     filterScalaLibrary in Global := true
   ) ++ Seq(Compile, Test, Runtime, Provided, Optional).flatMap(ivyReportForConfig)
 
@@ -181,7 +181,7 @@ object Plugin extends sbt.Plugin {
       val graph =  loadFromContext(moduleGraphStore, ctx, state) getOrElse ModuleGraph(Nil, Nil)
 
       import complete.DefaultParsers._
-      import Compat._
+      import SbtDependencyGraphCompat._
 
       def moduleFrom(modules: Seq[ModuleId]) =
         modules.map { m =>