added verbose mode activated with MVNW_VERBOSE set to true

maven-wrapper/CHANGELOG.md

@@ -3,12 +3,17 @@
 The [git commit history](https://github.com/takari/maven-wrapper/commits/master) is the detailed source of all changes.
 The following provides most information at an easier glance.
 
-## Version 0.2.2 or higher - Upcoming
+## Version 0.2.2 - 2017-09-12
 
 - Print out Maven Wrapper version with each invocation
   - see https://github.com/takari/maven-wrapper/pull/48
   - contributed by Tadaya Tsuyukubo - https://github.com/ttddyy
+- Verbose mode
+  - only print out basedir and version in verbose mode
+  - set by environment variable MVNW_VERBOSE="true"
+  - onctributed by Manfred Moser - http://www.simpligility.com
 
+Release performed by Manfred Moser - http://www.simpligility.com
 
 ## Version 0.2.1 - 2017-04-21
 

maven-wrapper/README.md

@@ -60,6 +60,13 @@ This is however not really tested by the committers.
 
 Please check out the [changelog](./CHANGELOG.md) for more information about our releases.
  
+## Verbose Mode
+
+The wrapper supports a verbose mode in which it outputs further information. It
+is activated by setting the MVNW_VERBOSE environment variable to `true`.
+
+By default it is off.
+
 ## Using a Different Version of Maven
 
 To switch the version of Maven used to build a project you can initialize it using 

maven-wrapper/mvnw

@@ -201,7 +201,9 @@ if [ -z "$BASE_DIR" ]; then
 fi
 
 export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
-echo $MAVEN_PROJECTBASEDIR
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
 MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
 
 # For Cygwin, switch paths to Windows format before running java

maven-wrapper/src/main/java/org/apache/maven/wrapper/MavenWrapperMain.java

@@ -36,13 +36,20 @@ public class MavenWrapperMain {
 
   public static final String MAVEN_USER_HOME_ENV_KEY = "MAVEN_USER_HOME";
 
+  public static final String MVNW_VERBOSE = "MVNW_VERBOSE";
+
   public static void main(String[] args) throws Exception {
+    Boolean verbose = System.getenv(MVNW_VERBOSE).equalsIgnoreCase("true");
+
     File wrapperJar = wrapperJar();
     File propertiesFile = wrapperProperties(wrapperJar);
     File rootDir = rootDir(wrapperJar);
 
     String wrapperVersion = wrapperVersion();
-    System.out.println("Takari Maven Wrapper " + wrapperVersion);
+
+    if (verbose) {
+      System.out.println("Takari Maven Wrapper " + wrapperVersion);
+    }
 
     Properties systemProperties = System.getProperties();
     systemProperties.putAll(parseSystemPropertiesFromArgs(args));