Made all test generators and scala-js generators to generate files only when necessary, completed this behavior now.

(cherry picked from commit a996db8)

Author: cheeseng

project/GenCommonTestJS.scala

@@ -60,7 +60,11 @@ object GenCommonTestJS {
     files.map { sourceFileName =>
       val sourceFile = new File(sourceDir, sourceFileName)
       val destFile = new File(packageDir, sourceFile.getName)
-      copyFile(sourceFile, destFile)
+      if (!destFile.exists || sourceFile.lastModified > destFile.lastModified) {
+        copyFile(sourceFile, destFile)
+      }
+
+      destFile
     }
   }
 

project/GenContain1.scala

@@ -19,6 +19,8 @@ import io.Source
 import java.io.{File, FileWriter, BufferedWriter}
 
 object GenContain1 extends GenContainBase {
+
+  val generatorSource = new File("GenContain1.scala")
 
   def genTest(targetBaseDir: File, version: String, scalaVersion: String): Seq[File] = {
 
@@ -29,21 +31,23 @@ object GenContain1 extends GenContainBase {
     def generateFile(sourceFileName: String, typeName: String, mapping: (String, String)*): File = {
       val generatedFileName = sourceFileName.replaceAll("List", typeName)
       val generatedFile = new File(targetBaseDir, generatedFileName)
-      val writer = new BufferedWriter(new FileWriter(generatedFile))
-      try {
-        val lines = Source.fromFile(new File(sourceBaseDir, sourceFileName)).getLines().toList // for 2.8
-        for (line <- lines) {
-          val generatedLine = translateLine(line, mapping.toList: _*)
-          writer.write(generatedLine.toString)
-          writer.newLine() // add for 2.8
+      if (!generatedFile.exists || generatorSource.lastModified > generatedFile.lastModified) {
+        val writer = new BufferedWriter(new FileWriter(generatedFile))
+        try {
+          val lines = Source.fromFile(new File(sourceBaseDir, sourceFileName)).getLines().toList // for 2.8
+          for (line <- lines) {
+            val generatedLine = translateLine(line, mapping.toList: _*)
+            writer.write(generatedLine.toString)
+            writer.newLine() // add for 2.8
+          }
+        }
+        finally {
+          writer.flush()
+          writer.close()
+          println("Generated " + generatedFile.getAbsolutePath)
         }
-        generatedFile
-      }
-      finally {
-        writer.flush()
-        writer.close()
-        println("Generated " + generatedFile.getAbsolutePath)
       }
+      generatedFile
     }
 
     Seq(

project/GenContain2.scala

@@ -20,6 +20,8 @@ import java.io.{File, FileWriter, BufferedWriter}
 
 object GenContain2 extends GenContainBase {
 
+  val generatorSource = new File("GenContain2.scala")
+
   def genTest(targetBaseDir: File, version: String, scalaVersion: String): Seq[File] = {
 
     val sourceBaseDir = new File("scalatest-test/src/test/scala/org/scalatest")
@@ -29,21 +31,23 @@ object GenContain2 extends GenContainBase {
     def generateFile(sourceFileName: String, typeName: String, mapping: (String, String)*): File = {
       val generatedFileName = sourceFileName.replaceAll("List", typeName)
       val generatedFile = new File(targetBaseDir, generatedFileName)
-      val writer = new BufferedWriter(new FileWriter(generatedFile))
-      try {
-        val lines = Source.fromFile(new File(sourceBaseDir, sourceFileName)).getLines().toList // for 2.8
-        for (line <- lines) {
-          val generatedLine = translateLine(line, mapping.toList: _*)
-          writer.write(generatedLine.toString)
-          writer.newLine() // add for 2.8
+      if (!generatedFile.exists || generatorSource.lastModified > generatedFile.lastModified) {
+        val writer = new BufferedWriter(new FileWriter(generatedFile))
+        try {
+          val lines = Source.fromFile(new File(sourceBaseDir, sourceFileName)).getLines().toList // for 2.8
+          for (line <- lines) {
+            val generatedLine = translateLine(line, mapping.toList: _*)
+            writer.write(generatedLine.toString)
+            writer.newLine() // add for 2.8
+          }
+        }
+        finally {
+          writer.flush()
+          writer.close()
+          println("Generated " + generatedFile.getAbsolutePath)
         }
-        generatedFile
-      }
-      finally {
-        writer.flush()
-        writer.close()
-        println("Generated " + generatedFile.getAbsolutePath)
       }
+      generatedFile
     }
 
     Seq(

project/GenEmpty.scala

@@ -19,6 +19,8 @@ import io.Source
 import java.io.{File, FileWriter, BufferedWriter}
 
 object GenEmpty {
+
+  val generatorSource = new File("GenEmpty.scala")
 
   def translateLine(line: String, mapping: (String, String)*): String = {
     @tailrec
@@ -41,21 +43,23 @@ object GenEmpty {
     def generateFile(sourceFileName: String, typeName: String, mapping: (String, String)*): File = {
       val generatedFileName = sourceFileName.replaceAll("List", typeName)
       val generatedFile = new File(targetBaseDir, generatedFileName)
-      val writer = new BufferedWriter(new FileWriter(generatedFile))
-      try {
-        val lines = Source.fromFile(new File(sourceBaseDir, sourceFileName)).getLines().toList // for 2.8
-        for (line <- lines) {
-          val generatedLine = translateLine(line, mapping.toList: _*)
-          writer.write(generatedLine.toString)
-          writer.newLine() // add for 2.8
+      if (!generatedFile.exists || generatorSource.lastModified > generatedFile.lastModified) {
+        val writer = new BufferedWriter(new FileWriter(generatedFile))
+        try {
+          val lines = Source.fromFile(new File(sourceBaseDir, sourceFileName)).getLines().toList // for 2.8
+          for (line <- lines) {
+            val generatedLine = translateLine(line, mapping.toList: _*)
+            writer.write(generatedLine.toString)
+            writer.newLine() // add for 2.8
+          }
+        }
+        finally {
+          writer.flush()
+          writer.close()
+          println("Generated " + generatedFile.getAbsolutePath)
         }
-        generatedFile
-      }
-      finally {
-        writer.flush()
-        writer.close()
-        println("Generated " + generatedFile.getAbsolutePath)
       }
+      generatedFile
     }
 
     val arrayMapping =