Updated mvn exec instructions

Author: Stanley Shyiko

README.md

@@ -408,14 +408,7 @@ import package.* // ktlint-disable
 
 ```sh
 git clone https://github.com/shyiko/ktlint && cd ktlint
-./mvnw # shows how to build, test, etc. project
-```
-#### Running ktlint from local build
-
-This will build ktlint and run it with any args you want to include.
-
-```sh
-gradle run --args="--color"
+./mvnw # shows how to build, test, run, etc. project
 ```
 
 #### Access to the latest `master` snapshot

ktlint/pom.xml

@@ -225,6 +225,14 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.6.0</version>
+                <configuration>
+                    <mainClass>com.github.shyiko.ktlint.Main</mainClass>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

pom.xml

@@ -174,6 +174,9 @@
                         # test (& check code style)
                         ./mvnw clean verify
 
+                        # run
+                        ./mvnw -pl ktlint compile exec:java -Dexec.args="--help"
+
                         # publish a new version
                         ./mvnw versions:set -DnewVersion=<version>
                         ./mvnw -Ddeploy=maven-central