Make sure -ro argument point to a valid directory, close #612

gatling-charts/src/main/scala/com/excilys/ebi/gatling/charts/result/reader/FileDataReader.scala

@@ -79,7 +79,7 @@ class FileDataReader(runUuid: String) extends DataReader(runUuid) with Logging {
 			}
 		}
 
-		simulationLogDirectory(runUuid).toDirectory.files.filter(_.jfile.getName.matches(FileDataReader.SIMULATION_FILES_NAME_PATTERN)).foreach(readFile(_))
+		simulationLogDirectory(runUuid, false).files.filter(_.jfile.getName.matches(FileDataReader.SIMULATION_FILES_NAME_PATTERN)).foreach(readFile(_))
 
 		val sortedRequestNames = requestNames.toSeq.sortBy(_._2).map(_._1)
 		val sortedScenarioNames = scenarioNames.toSeq.sortBy(_._2).map(_._1)
@@ -109,8 +109,8 @@ class FileDataReader(runUuid: String) extends DataReader(runUuid) with Logging {
 	def meanResponseTime(status: Option[RequestStatus], requestName: Option[String]): Long = StatisticsHelper.meanResponseTime(requestRecords, status, requestName)
 
 	def meanLatency(status: Option[RequestStatus], requestName: Option[String]): Long = StatisticsHelper.meanLatency(requestRecords, status, requestName)
-	
-	def meanNumberOfRequestsPerSecond(status: Option[RequestStatus], requestName: Option[String]) : Long = StatisticsHelper.meanNumberOfRequestsPerSecond(requestRecords, status, requestName)
+
+	def meanNumberOfRequestsPerSecond(status: Option[RequestStatus], requestName: Option[String]): Long = StatisticsHelper.meanNumberOfRequestsPerSecond(requestRecords, status, requestName)
 
 	def responseTimeStandardDeviation(status: Option[RequestStatus] = None, requestName: Option[String] = None): Long = StatisticsHelper.responseTimeStandardDeviation(requestRecords, status, requestName): Long
 

gatling-core/src/main/scala/com/excilys/ebi/gatling/core/config/GatlingFiles.scala

@@ -40,8 +40,11 @@ object GatlingFiles {
 	def jsFolder(runUuid: String): Path = resultFolder(runUuid) / GATLING_JS
 	def styleFolder(runUuid: String): Path = resultFolder(runUuid) / GATLING_STYLE
 	def rawDataFolder(runUuid: String): Path = resultFolder(runUuid) / "rawdata"
-	def simulationLogDirectory(runUuid: String): Directory = {
+	def simulationLogDirectory(runUuid: String, create: Boolean = true): Directory = {
 		val dir = resultFolder(runUuid)
-		dir.createDirectory()
+		if (create) dir.createDirectory()
+		else if (!dir.exists) throw new IllegalArgumentException("simulation directory '" + dir + "' doesn't exist")
+		else if (!dir.isDirectory) throw new IllegalArgumentException("simulation directory '" + dir + "' is not a directory")
+		else dir.toDirectory
 	}
 }