Common constant for Kotlin's license header delimiter

To share same regex between Gradle and Maven plugins.

lib/src/main/java/com/diffplug/spotless/kotlin/KotlinConstants.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2016 DiffPlug
+ *
+ * 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 com.diffplug.spotless.kotlin;
+
+public final class KotlinConstants {
+
+	// '^' is prepended to the regex in LICENSE_HEADER_DELIMITER later in FormatExtension.licenseHeader(String, String)
+	public static final String LICENSE_HEADER_DELIMITER = "(package |@file)";
+
+	private KotlinConstants() {}
+}

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/KotlinExtension.java

@@ -15,6 +15,8 @@
  */
 package com.diffplug.gradle.spotless;
 
+import static com.diffplug.spotless.kotlin.KotlinConstants.LICENSE_HEADER_DELIMITER;
+
 import java.util.Objects;
 
 import org.gradle.api.GradleException;
@@ -25,8 +27,6 @@
 import com.diffplug.spotless.kotlin.KtLintStep;
 
 public class KotlinExtension extends FormatExtension {
-	// '^' is prepended to the regex in LICENSE_HEADER_DELIMITER later in FormatExtension.licenseHeader(String, String)
-	private static final String LICENSE_HEADER_DELIMITER = "(package |@file)";
 	static final String NAME = "kotlin";
 
 	public KotlinExtension(SpotlessExtension rootExtension) {

plugin-maven/src/main/java/com/diffplug/spotless/maven/kotlin/Kotlin.java

@@ -16,6 +16,7 @@
 package com.diffplug.spotless.maven.kotlin;
 
 import static com.diffplug.common.collect.Sets.newHashSet;
+import static com.diffplug.spotless.kotlin.KotlinConstants.LICENSE_HEADER_DELIMITER;
 import static java.util.Collections.unmodifiableSet;
 
 import java.util.Set;
@@ -27,8 +28,6 @@ public class Kotlin extends FormatterFactory {
 	private static final Set<String> DEFAULT_INCLUDES = unmodifiableSet(newHashSet("src/main/kotlin/**/*.kt",
 			"src/test/kotlin/**/*.kt"));
 
-	private static final String LICENSE_HEADER_DELIMITER = "(package |@file)";
-
 	@Override
 	public Set<String> defaultIncludes() {
 		return DEFAULT_INCLUDES;