增加将proguard输出到Maven插件日志的功能

src/main/java/com/github/wvengen/maven/proguard/MavenloggingBinder.java

@@ -0,0 +1,49 @@
+package com.github.wvengen.maven.proguard;
+
+import org.apache.maven.plugin.logging.Log;
+import org.apache.tools.ant.DefaultLogger;
+import org.apache.tools.ant.Project;
+
+import java.io.PrintStream;
+
+public class MavenloggingBinder extends DefaultLogger {
+
+    private final Log log;
+
+    public MavenloggingBinder(Log log) {
+        this.log = log;
+    }
+
+    @Override
+    public void setOutputPrintStream(PrintStream output) {
+
+    }
+
+    @Override
+    public void setErrorPrintStream(PrintStream err) {
+
+    }
+
+    @Override
+    protected void printMessage(String message, PrintStream stream, int priority) {
+        switch (priority) {
+            case Project.MSG_ERR: {
+                log.error(message);
+                break;
+            }
+            case Project.MSG_VERBOSE:
+            case Project.MSG_DEBUG: {
+                log.debug(message);
+                break;
+            }
+            case Project.MSG_WARN: {
+                log.warn(message);
+                break;
+            }
+            default: {
+                log.info(message);
+                break;
+            }
+        }
+    }
+}

src/main/java/com/github/wvengen/maven/proguard/ProGuardMojo.java

@@ -389,6 +389,13 @@ public class ProGuardMojo extends AbstractMojo {
 	 */
 	private boolean silent;
 
+	/**
+	 * bind proguard output to maven plugin logging.
+	 *
+	 * @parameter default-value="false"
+	 */
+	private boolean bindToMavenLogging;
+
 	private Log log;
 
 	/**
@@ -1003,9 +1010,14 @@ private void proguardMain(Collection<File> proguardJars, List<String> argsList,
 		antProject.setName(mojo.mavenProject.getName());
 		antProject.init();
 
-		DefaultLogger antLogger = new DefaultLogger();
-		antLogger.setOutputPrintStream(System.out);
-		antLogger.setErrorPrintStream(System.err);
+		DefaultLogger antLogger;
+		if (bindToMavenLogging) {
+			antLogger = new MavenloggingBinder(mojo.log);
+		} else {
+			antLogger = new DefaultLogger();
+			antLogger.setOutputPrintStream(System.out);
+			antLogger.setErrorPrintStream(System.err);
+		}
 		int logLevel = mojo.log.isDebugEnabled() ? Project.MSG_DEBUG : Project.MSG_INFO;
 		antLogger.setMessageOutputLevel(silent ? Project.MSG_ERR : logLevel);