Baby steps for incremental compilation.

ide-compiler-runner/src/org/jetbrains/jet/compiler/runner/KotlinCompilerRunner.java

@@ -34,6 +34,7 @@ import org.jetbrains.jet.compiler.CompilerSettings;
 
 import java.io.File;
 import java.io.PrintStream;
+import java.util.Collection;
 import java.util.List;
 
 public class KotlinCompilerRunner {
@@ -65,7 +66,7 @@ public class KotlinCompilerRunner {
             MessageCollector messageCollector,
             CompilerEnvironment environment,
             OutputItemsCollector collector,
-            List<File> sourceFiles,
+            Collection<File> sourceFiles,
             List<String> libraryFiles,
             File outputFile
     ) {
@@ -151,7 +152,7 @@ public class KotlinCompilerRunner {
 
     private static void setupK2JsArguments(
             File outputFile,
-            List<File> sourceFiles,
+            Collection<File> sourceFiles,
             List<String> libraryFiles,
             K2JSCompilerArguments settings
     ) {

ide-compiler-runner/src/org/jetbrains/jet/compiler/runner/KotlinModuleXmlBuilderFactory.java

@@ -85,13 +85,13 @@ public class KotlinModuleXmlBuilderFactory implements KotlinModuleDescriptionBui
                 public void processClassPathSection(@NotNull String sectionDescription, @NotNull Collection<File> files) {
                     p.println("<!-- ", sectionDescription, " -->");
                     for (File file : files) {
-                        boolean isOutput = directoriesToFilterOut.contains(file);
+                        boolean isOutput = directoriesToFilterOut.contains(file); // TODO make it optional
                         if (isOutput) {
                             // For IDEA's make (incremental compilation) purposes, output directories of the current module and its dependencies
                             // appear on the class path, so we are at risk of seeing the results of the previous build, i.e. if some class was
                             // removed in the sources, it may still be there in binaries. Thus, we delete these entries from the classpath.
                             p.println("<!-- Output directory, commented out -->");
-                            p.println("<!-- ");
+                            //p.println("<!-- ");
                             p.pushIndent();
                         }
 
@@ -99,7 +99,7 @@ public class KotlinModuleXmlBuilderFactory implements KotlinModuleDescriptionBui
 
                         if (isOutput) {
                             p.popIndent();
-                            p.println("-->");
+                            //p.println("-->");
                         }
                     }
                 }