Introduce "Ignored Statements" count in HTML report

This count only includes statements excluded using the $COVERAGE-OFF$ tag,
not those excluded using the sbt "coverageExcludedPackages" or maven
"excludedPackages", etc. flags.

Author: rigoford

scalac-scoverage-plugin/src/main/scala/scoverage/Serializer.scala

@@ -121,7 +121,8 @@ object Serializer {
 
     val coverage = Coverage()
     for ( statement <- statements )
-      if (!statement.ignored) coverage.add(statement)
+      if (statement.ignored) coverage.addIgnoredStatement(statement)
+      else coverage.add(statement)
     coverage
   }
 

scalac-scoverage-plugin/src/main/scala/scoverage/coverage.scala

@@ -18,6 +18,11 @@ case class Coverage()
   override def statements = statementsById.values
   def add(stmt: Statement): Unit = statementsById.put(stmt.id, stmt)
 
+  private val ignoredStatementsById = mutable.Map[Int, Statement]()
+  override def ignoredStatements = ignoredStatementsById.values
+  def addIgnoredStatement(stmt: Statement): Unit = ignoredStatementsById.put(stmt.id, stmt)
+
+
   def avgClassesPerPackage = classCount / packageCount.toDouble
   def avgClassesPerPackageFormatted: String = "%.2f".format(avgClassesPerPackage)
 
@@ -65,23 +70,30 @@ trait FileBuilders {
   def fileCount: Int = files.size
 }
 
-case class MeasuredMethod(name: String, statements: Iterable[Statement]) extends CoverageMetrics
+case class MeasuredMethod(name: String, statements: Iterable[Statement]) extends CoverageMetrics {
+  override def ignoredStatements: Iterable[Statement] = ???
+}
 
 case class MeasuredClass(name: String, statements: Iterable[Statement])
   extends CoverageMetrics with MethodBuilders {
   def source: String = statements.head.source
   def simpleName = name.split('.').last
   def loc = statements.map(_.line).max
+
+  override def ignoredStatements: Iterable[Statement] = ???
 }
 
 case class MeasuredPackage(name: String, statements: Iterable[Statement])
   extends CoverageMetrics with ClassCoverage with ClassBuilders with FileBuilders {
+  override def ignoredStatements: Iterable[Statement] = ???
 }
 
 case class MeasuredFile(source: String, statements: Iterable[Statement])
   extends CoverageMetrics with ClassCoverage with ClassBuilders {
   def filename = new File(source).getName
   def loc = statements.map(_.line).max
+
+  override def ignoredStatements: Iterable[Statement] = ???
 }
 
 case class Statement(source: String,
@@ -127,6 +139,10 @@ object ClassRef {
 trait CoverageMetrics {
   def statements: Iterable[Statement]
   def statementCount: Int = statements.size
+
+  def ignoredStatements: Iterable[Statement]
+  def ignoredStatementCount: Int = ignoredStatements.size
+
   def invokedStatements: Iterable[Statement] = statements.filter(_.count > 0)
   def invokedStatementCount = invokedStatements.size
   def statementCoverage: Double = if (statementCount == 0) 1 else invokedStatementCount / statementCount.toDouble

scalac-scoverage-plugin/src/main/scala/scoverage/report/ScoverageHtmlWriter.scala

@@ -494,6 +494,20 @@ class ScoverageHtmlWriter(sourceDirectories: Seq[File], outputDir: File) extends
           {coverage.invokedBranchesCount.toString}
         </td>
       </tr>
+      <tr>
+        <td>
+          Ignored statements:
+        </td>
+        <td>
+          {coverage.ignoredStatementCount.toString}
+        </td>
+        <td></td>
+        <td></td>
+        <td></td>
+        <td></td>
+        <td></td>
+        <td></td>
+      </tr>
       <tr>
         <td>
           Statement coverage: