Grab and redirect standard streams, fixes #100

client/src/main/java/org/jboss/fuse/mvnd/client/DefaultClient.java

@@ -59,7 +59,7 @@ public class DefaultClient implements Client {
                 if (i < argv.length) {
                     logFile = Paths.get(argv[i++]);
                 } else {
-                    throw new IllegalArgumentException("-l and --log-file need to befollowed by a path");
+                    throw new IllegalArgumentException("-l and --log-file need to be followed by a path");
                 }
             } else {
                 args.add(arg);

daemon/src/main/java/org/jboss/fuse/mvnd/logging/smart/LoggingExecutionListener.java

@@ -17,12 +17,20 @@ package org.jboss.fuse.mvnd.logging.smart;
 
 import org.apache.maven.execution.ExecutionEvent;
 import org.apache.maven.execution.ExecutionListener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.slf4j.MDC;
 
 public class LoggingExecutionListener implements ExecutionListener {
 
     private final ExecutionListener delegate;
 
+    static {
+        Logger logger = LoggerFactory.getLogger("org.jboss.fuse.mvnd");
+        System.setOut(new LoggingOutputStream(s -> logger.info("[stdout] " + s)).printStream());
+        System.setErr(new LoggingOutputStream(s -> logger.info("[stderr] " + s)).printStream());
+    }
+
     public LoggingExecutionListener(ExecutionListener delegate) {
         this.delegate = delegate;
     }

daemon/src/main/java/org/jboss/fuse/mvnd/logging/smart/LoggingOutputStream.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jboss.fuse.mvnd.logging.smart;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.function.Consumer;
+
+public class LoggingOutputStream extends FilterOutputStream {
+
+    static final byte[] LINE_SEP = System.lineSeparator().getBytes();
+
+    final EolBaos buf;
+    final Consumer<String> consumer;
+
+    public LoggingOutputStream(Consumer<String> consumer) {
+        this(new EolBaos(), consumer);
+    }
+
+    LoggingOutputStream(EolBaos out, Consumer<String> consumer) {
+        super(out);
+        this.buf = out;
+        this.consumer = consumer;
+    }
+
+    public PrintStream printStream() {
+        return new PrintStream(this);
+    }
+
+    @Override
+    public void write(int b) throws IOException {
+        super.write(b);
+        if (buf.isEol()) {
+            String line = new String(buf.toByteArray(), 0, buf.size() - LINE_SEP.length);
+            consumer.accept(line);
+            buf.reset();
+        }
+    }
+
+    static class EolBaos extends ByteArrayOutputStream {
+        boolean isEol() {
+            if (count >= LINE_SEP.length) {
+                for (int i = 0; i < LINE_SEP.length; i++) {
+                    if (buf[count - LINE_SEP.length + i] != LINE_SEP[i]) {
+                        return false;
+                    }
+                }
+                return true;
+            }
+            return false;
+        }
+    }
+}