1 files changed, 77 insertions, 0 deletions
diff --git a/Scala/patmat/project/StyleChecker.scala b/Scala/patmat/project/StyleChecker.scala
new file mode 100644
index 0000000..fbc1cdf
--- /dev/null
+++ b/Scala/patmat/project/StyleChecker.scala
@@ -0,0 +1,77 @@
+import sbt.File
+import java.io.ByteArrayOutputStream
+import java.io.PrintStream
+import org.scalastyle._
+
+object StyleChecker {
+  val maxResult = 100
+
+  class CustomTextOutput[T <: FileSpec]() extends Output[T] {
+    private val messageHelper = new MessageHelper(this.getClass().getClassLoader())
+
+    var fileCount: Int = _
+    override def message(m: Message[T]): Unit = m match {
+      case StartWork() =>
+      case EndWork() =>
+      case StartFile(file) =>
+        print("Checking file " + file + "...")
+        fileCount = 0
+      case EndFile(file) =>
+        if (fileCount == 0) println(" OK!")
+      case StyleError(file, clazz, key, level, args, line, column, customMessage) =>
+        report(line, column, messageHelper.text(level.name),
+            findMessage(messageHelper, clazz, key, args, customMessage))
+      case StyleException(file, clazz, message, stacktrace, line, column) =>
+        report(line, column, "error", message)
+    }
+
+    private def report(line: Option[Int], column: Option[Int], level: String, message: String) {
+      if (fileCount == 0) println("")
+      fileCount += 1
+      println("  " + fileCount + ". " + level + pos(line, column) + ":")
+      println("     " + message)
+    }
+
+    private def pos(line: Option[Int], column: Option[Int]): String = line match {
+      case Some(line) => " at line " + line + (column match {
+        case Some(column) => " character " + column
+        case None => ""
+      })
+      case None => ""
+    }
+  }
+
+  def score(outputResult: OutputResult) = {
+    val penalties = outputResult.errors + outputResult.warnings
+    scala.math.max(maxResult - penalties, 0)
+  }
+
+  def assess(allSources: Seq[File]): (String, Int) = {
+    val configFile = new File("project/scalastyle_config.xml").getAbsolutePath
+
+    val sources = allSources.filterNot{ f =>
+      val path = f.getAbsolutePath
+      path.contains("interpreter") ||
+      path.contains("simulations") ||
+      path.contains("fetchtweets")
+    }
+
+    val messages = new ScalastyleChecker().checkFiles(
+      ScalastyleConfiguration.readFromXml(configFile),
+      Directory.getFiles(sources : _*))
+
+    val output = new ByteArrayOutputStream()
+    val outputResult = Console.withOut(new PrintStream(output)) {
+      new CustomTextOutput().output(messages)
+    }
+
+    val msg =
+      output.toString +
+      "Processed " + outputResult.files + " file(s)\n" +
+      "Found " + outputResult.errors + " errors\n" +
+      "Found " + outputResult.warnings + " warnings\n" +
+      (if (outputResult.errors+outputResult.warnings > 0) "Consult the style guide at https://class.coursera.org/progfun-002/wiki/view?page=GradingPolicy" else "")
+
+    (msg, score(outputResult))
+  }
+}