Drop "-sourceFiles" in kotlinc-js

Use free arguments instead, as is done in kotlinc-jvm and all sensible
compilers everywhere

Also fix some cases of AntTaskTest to be able to run them locally

build-tools/ant/src/org/jetbrains/jet/buildtools/ant/Kotlin2JsCompilerTask.kt

@@ -26,7 +26,6 @@ import org.jetbrains.jet.cli.js.K2JSCompiler
 import java.io.File
 import org.apache.tools.ant.BuildException
 import org.jetbrains.jet.cli.common.ExitCode
-import java.util.Arrays
 
 /**
  * Kotlin JavaScript compiler Ant task.
@@ -76,7 +75,7 @@ public class Kotlin2JsCompilerTask : Task() {
         val arguments = K2JSCompilerArguments()
 
         val sourcePaths = src ?: throw BuildException("\"src\" should be specified")
-        arguments.sourceFiles = Util.getPaths(sourcePaths.list())
+        arguments.freeArgs = Util.getPaths(sourcePaths.list()).toList()
 
         val outputFile = output ?: throw BuildException("\"output\" should be specified")
         arguments.outputFile = outputFile.canonicalPath
@@ -87,7 +86,7 @@ public class Kotlin2JsCompilerTask : Task() {
         arguments.main = main
         arguments.sourcemap = sourcemap
 
-        log("Compiling [${arguments.sourceFiles?.makeString(",")}] => [${arguments.outputFile}]");
+        log("Compiling ${arguments.freeArgs} => [${arguments.outputFile}]");
 
         val compiler = K2JSCompiler()
         val exitCode = compiler.exec(MessageCollectorPlainTextToStream.PLAIN_TEXT_TO_SYSTEM_ERR, arguments)

build-tools/core/src/org/jetbrains/jet/buildtools/core/Util.java

@@ -21,16 +21,10 @@ import org.jetbrains.annotations.NotNull;
 import java.io.File;
 import java.io.IOException;
 
-
-/**
- * General convenient utilities.
- */
 public final class Util {
-
     private Util() {
     }
 
-
     /**
      * {@code file.getCanonicalPath()} convenience wrapper.
      *
@@ -47,6 +41,7 @@ public final class Util {
         }
     }
 
+    @NotNull
     public static String[] getPaths(String[] paths) {
         String[] result = new String[paths.length];
         for (int i = 0; i < paths.length; i++) {