diff --git a/build.sbt b/build.sbt
index 22c6e9387f..46c7736458 100644
--- a/build.sbt
+++ b/build.sbt
@@ -38,6 +38,7 @@ libraryDependencies ++= Seq(
   "ch.qos.logback" % "logback-classic" % "1.1.3",
   "org.scalameta" %% "scalameta" % "0.1.0-SNAPSHOT",
   "com.googlecode.java-diff-utils" % "diffutils" % "1.3.0" % "test",
+  "com.lihaoyi" %% "scalatags" % "0.5.4" % "test",
   "org.scalatest" %% "scalatest" % "2.2.1" % "test"
 )
 
diff --git a/src/main/scala/org/scalafmt/Debug.scala b/src/main/scala/org/scalafmt/Debug.scala
index f5eeff28ba..33c343503b 100644
--- a/src/main/scala/org/scalafmt/Debug.scala
+++ b/src/main/scala/org/scalafmt/Debug.scala
@@ -2,31 +2,47 @@ package org.scalafmt
 
 import scala.collection.mutable
 import scala.meta.Tree
+import scala.meta.tokens.Token
 
 object Debug extends ScalaFmtLogger {
   val treeExplored = mutable.Map.empty[Tree, Int]
-  val tokenExplored = mutable.Map.empty[FormatToken, Int]
+  val tokenExplored = mutable.Map.empty[Token, Int]
+  val formatTokenExplored = mutable.Map.empty[FormatToken, Int]
   var explored = 0
+  var state = State.start
+  var toks = Array.empty[FormatToken]
 
   def clear(): Unit = {
     treeExplored.clear()
     tokenExplored.clear()
   }
 
-  def visit(token: FormatToken): Unit = {
+  def visit(token: Token): Unit = {
     val visits = tokenExplored.getOrElse(token, 0) + 1
     tokenExplored += token -> visits
   }
 
-  def reportTokens = {
-    tokenExplored.toSeq.sortBy(_._1.right.end).foreach {
+  def visit(token: FormatToken): Unit = {
+    visit(token.left)
+    visit(token.right)
+    val visits = formatTokenExplored.getOrElse(token, 0) + 1
+    formatTokenExplored += token -> visits
+  }
+
+  def visit(tree: Tree): Unit = {
+    val visits = treeExplored.getOrElse(tree, 0) + 1
+    treeExplored += tree -> visits
+  }
+
+  def reportTokens() = {
+    formatTokenExplored.toSeq.sortBy(_._1.right.end).foreach {
       case (code, count) =>
         logger.debug(
           f"""$count%-5s $code""".stripMargin)
     }
   }
 
-  def reportTrees = {
+  def reportTrees() = {
     Debug.treeExplored.toSeq.sortBy(_._2).foreach { case (code, count) =>
       logger.debug(
         f"""$count%-5s
@@ -34,8 +50,4 @@ object Debug extends ScalaFmtLogger {
     }
   }
 
-  def visit(tree: Tree): Unit = {
-    val visits = treeExplored.getOrElse(tree, 0) + 1
-    treeExplored += tree -> visits
-  }
 }
diff --git a/src/main/scala/org/scalafmt/ScalaFmt.scala b/src/main/scala/org/scalafmt/ScalaFmt.scala
index 76f6692c9d..16f4e00895 100644
--- a/src/main/scala/org/scalafmt/ScalaFmt.scala
+++ b/src/main/scala/org/scalafmt/ScalaFmt.scala
@@ -99,6 +99,8 @@ class ScalaFmt(val style: ScalaStyle) extends ScalaFmtLogger {
       logger.warn("UNABLE TO FORMAT")
     }
     Debug.explored += explored
+    Debug.state = state
+    Debug.toks = toks
     state.reconstructPath(toks, style)
   }
 
diff --git a/src/main/scala/org/scalafmt/State.scala b/src/main/scala/org/scalafmt/State.scala
index 47b8110c2b..8786c9be0c 100644
--- a/src/main/scala/org/scalafmt/State.scala
+++ b/src/main/scala/org/scalafmt/State.scala
@@ -33,7 +33,8 @@ case class State(cost: Int,
     * Returns formatted output from FormatTokens and Splits.
     */
   def reconstructPath(toks: Array[FormatToken],
-                      style: ScalaStyle): String = {
+                      style: ScalaStyle,
+                      f: FormatToken => String = _.left.code): String = {
     //    require(splits.length - start.splits.length == toks.length,
     //      s"${toks.toVector} $splits")
     val sb = new StringBuilder()
@@ -42,7 +43,7 @@ case class State(cost: Int,
       case (tok, split) =>
         //        logger.debug(s"${log(tok.left)} $split ${state.indents}")
         state = state.next(style, split, tok)
-        sb.append(tok.left.code)
+        sb.append(f(tok))
         val ws = split.modification match {
           case Space =>
             sb.append(" ")
diff --git a/src/test/resources/TypeArgument.test b/src/test/resources/TypeArgument.test
index 2038abd8f8..62d417bab5 100644
--- a/src/test/resources/TypeArgument.test
+++ b/src/test/resources/TypeArgument.test
@@ -64,6 +64,16 @@ object a {
   function[function[function[a, b],
                     function[c, d]]]
 }
+<<< SKIP Break on higher level of nesting 3x.
+object a {
+  function[function[function[function[a, b], function[c, d]]]]
+}
+>>>
+object a {
+  function[function[
+      function[function[a, b],
+               function[c, d]]]]
+}
 <<< SKIP Type args and args different policy.
 object Object {
   val x = function[a1234567, b1234567](a)
diff --git a/src/test/scala/org/scalafmt/FilesUtil.scala b/src/test/scala/org/scalafmt/FilesUtil.scala
index cd7d49cb02..09610e3a29 100644
--- a/src/test/scala/org/scalafmt/FilesUtil.scala
+++ b/src/test/scala/org/scalafmt/FilesUtil.scala
@@ -17,4 +17,9 @@ object FilesUtil {
   def readFile(filename: String): String = new String(
     java.nio.file.Files.readAllBytes(java.nio.file.Paths.get(filename)))
 
+  def writeFile(filename: String, content: String): Unit = {
+    val path = java.nio.file.Paths.get(filename)
+    java.nio.file.Files.write(path, content.getBytes)
+  }
+
 }
diff --git a/src/test/scala/org/scalafmt/FormatTest.scala b/src/test/scala/org/scalafmt/FormatTest.scala
index 6af4cd4cd6..30eb36f568 100644
--- a/src/test/scala/org/scalafmt/FormatTest.scala
+++ b/src/test/scala/org/scalafmt/FormatTest.scala
@@ -7,8 +7,16 @@ import org.scalatest.FunSuite
 import org.scalatest.concurrent.Timeouts
 import org.scalatest.time.SpanSugar._
 
+import scala.collection.mutable
+
 case class DiffTest(spec: String, name: String, original: String, expected: String)
 
+case class Result(test: DiffTest,
+                  obtained: String,
+                  obtainedHtml: String,
+                  redness: Int,
+                  time: Long)
+
 trait FormatTest
   extends FunSuite with Timeouts with ScalaFmtLogger with BeforeAndAfterAll {
 
@@ -21,6 +29,14 @@ trait FormatTest
   val fmt = new ScalaFmt(style)
 
   lazy val onlyOne = tests.exists(_.name.startsWith("ONLY"))
+  val reports = mutable.ArrayBuilder.make[Result]
+
+  def red(token: FormatToken): Int = {
+    val max = 10
+    val i = Math.min(max, Debug.formatTokenExplored(token))
+    val k = (i.toDouble / max.toDouble * 256).toInt
+    Math.min(256, 270 - k)
+  }
 
   tests.sortWith {
     case (left, right) =>
@@ -31,22 +47,40 @@ trait FormatTest
     !t.name.startsWith("SKIP") &&
       (!onlyOne || t.name.startsWith("ONLY"))
   }.foreach {
-    case DiffTest(spec, name, original, expected) =>
+    case t@DiffTest(spec, name, original, expected) =>
       val testName = s"$spec: $name"
       test(f"$testName%-50s|") {
         failAfter(10 seconds) {
           Debug.clear()
           val before = Debug.explored
-          val result = fmt.format(original)
+          val start = System.currentTimeMillis()
+          val obtained = fmt.format(original)
           logger.debug(f"${Debug.explored - before}%-4s $testName")
+          var maxTok = 0
+          val obtainedHtml =
+            Debug.state.reconstructPath(Debug.toks, style, { tok =>
+              import scalatags.Text.all._
+              val color = red(tok)
+              maxTok = Math.max(Debug.formatTokenExplored(tok), maxTok)
+              span(background := s"rgb(256, $color, $color)", tok.left.code).render
+            })
+          reports += Result(t,
+            obtained,
+            obtainedHtml,
+            maxTok,
+            System.currentTimeMillis() - start)
+
           if (name.startsWith("ONLY"))
-            Debug.reportTokens
-          assert(result diff expected)
+            Debug.reportTokens()
+          assert(obtained diff expected)
         }
       }
   }
 
   override def afterAll(configMap: ConfigMap): Unit = {
     logger.debug(s"Total explored: ${Debug.explored}")
+    val report = Report.generate(reports.result())
+    val filename = "target/index.html"
+    FilesUtil.writeFile(filename, report)
   }
 }
diff --git a/src/test/scala/org/scalafmt/Report.scala b/src/test/scala/org/scalafmt/Report.scala
new file mode 100644
index 0000000000..8864003bd7
--- /dev/null
+++ b/src/test/scala/org/scalafmt/Report.scala
@@ -0,0 +1,29 @@
+package org.scalafmt
+
+import scalatags.Text.all._
+
+object Report {
+  def generate(results: Seq[Result]): String = {
+    html(
+      head(
+      ),
+      body(
+        div(
+          h1(id := "title", "Heatmap"),
+          for (result <- results.sortBy(-_.redness)
+               if result.test.name != "Warmup") yield {
+            div(
+              h2(result.test.name),
+              pre(
+                code(
+                raw(result.obtainedHtml)
+                )
+              )
+            )
+          }
+        )
+      )
+    ).render
+  }
+
+}