Support '-suppress warnings'

#KT-3319 In Progress

compiler/cli/src/org/jetbrains/jet/cli/CommonCompilerArguments.java

@@ -12,6 +12,8 @@ public abstract class CommonCompilerArguments extends CompilerArguments {
     public boolean version;
     @Argument(value = "help", alias = "h", description = "Show help")
     public boolean help;
+    @Argument(value = "suppress", description = "Suppress compiler messages by severity (warnings)")
+    public String suppress;
 
     @Override
     public boolean isHelp() {
@@ -40,4 +42,9 @@ public abstract class CommonCompilerArguments extends CompilerArguments {
     public void setTags(boolean tags) {
         this.tags = tags;
     }
+
+    @Override
+    public boolean suppressAllWarnings() {
+        return "warnings".equalsIgnoreCase(suppress);
+    }
 }

compiler/cli/src/org/jetbrains/jet/cli/common/CLICompiler.java

@@ -16,6 +16,7 @@
 
 package org.jetbrains.jet.cli.common;
 
+import com.google.common.base.Predicates;
 import com.intellij.openapi.Disposable;
 import com.intellij.openapi.util.Disposer;
 import com.sampullara.cli.Args;
@@ -27,9 +28,7 @@ import org.jetbrains.jet.config.CompilerConfiguration;
 
 import java.io.PrintStream;
 
-import static org.jetbrains.jet.cli.common.ExitCode.COMPILATION_ERROR;
-import static org.jetbrains.jet.cli.common.ExitCode.INTERNAL_ERROR;
-import static org.jetbrains.jet.cli.common.ExitCode.OK;
+import static org.jetbrains.jet.cli.common.ExitCode.*;
 
 public abstract class CLICompiler<A extends CompilerArguments> {
 
@@ -108,10 +107,14 @@ public abstract class CLICompiler<A extends CompilerArguments> {
 
         printVersionIfNeeded(errStream, arguments, messageRenderer);
 
-        PrintingMessageCollector printingCollector = new PrintingMessageCollector(errStream, messageRenderer, arguments.isVerbose());
+        MessageCollector collector = new PrintingMessageCollector(errStream, messageRenderer, arguments.isVerbose());
+
+        if (arguments.suppressAllWarnings()) {
+            collector = new FilteringMessageCollector(collector, Predicates.equalTo(CompilerMessageSeverity.WARNING));
+        }
 
         try {
-            return exec(printingCollector, arguments);
+            return exec(collector, arguments);
         }
         finally {
             errStream.print(messageRenderer.renderConclusion());

compiler/cli/src/org/jetbrains/jet/cli/common/CompilerArguments.java

@@ -45,4 +45,6 @@ public abstract class CompilerArguments {
     public abstract boolean isVerbose();
 
     public abstract String getSrc();
+
+    public abstract boolean suppressAllWarnings();
 }