Add license header recipe

src/main/java/org/openrewrite/javascript/AddLicenseHeader.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2023 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.openrewrite.javascript;
+
+import lombok.EqualsAndHashCode;
+import lombok.Value;
+import org.openrewrite.ExecutionContext;
+import org.openrewrite.Option;
+import org.openrewrite.Recipe;
+import org.openrewrite.TreeVisitor;
+import org.openrewrite.java.MethodMatcher;
+
+
+@Value
+@EqualsAndHashCode(callSuper = true)
+public class AddLicenseHeader extends Recipe {
+    /**
+     * A method pattern that is used to find matching method declarations/invocations.
+     * See {@link  MethodMatcher} for details on the expression's syntax.
+     */
+    @Option(displayName = "License text",
+        description = "The license header text without the block comment. May contain ${CURRENT_YEAR} property.",
+        example = "Copyright ${CURRENT_YEAR} the original author or authors...")
+    String licenseText;
+
+    @Override
+    public String getDisplayName() {
+        return "Add license header";
+    }
+
+    @Override
+    public String getDescription() {
+        return "Adds license headers to JavaScript source files when missing. Does not override existing license headers.";
+    }
+
+    @Override
+    public TreeVisitor<?, ExecutionContext> getVisitor() {
+        return new org.openrewrite.java.AddLicenseHeader(licenseText).getVisitor();
+    }
+}

src/test/java/org/openrewrite/javascript/recipe/AddLicenseHeaderTest.java

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+/*
+ * Copyright 2023 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.openrewrite.javascript.recipe;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.openrewrite.javascript.AddLicenseHeader;
+import org.openrewrite.test.RecipeSpec;
+import org.openrewrite.test.RewriteTest;
+
+import static java.util.Calendar.YEAR;
+import static java.util.Calendar.getInstance;
+import static org.openrewrite.javascript.Assertions.javaScript;
+
+public class AddLicenseHeaderTest implements RewriteTest {
+
+    @Override
+    public void defaults(RecipeSpec spec) {
+        spec.recipe(new AddLicenseHeader(
+          """
+            Copyright ${CURRENT_YEAR} the original author or authors.
+            <p>
+            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
+            """.trim()
+        ));
+    }
+
+    @Test
+    void addLicenseHeader() {
+        rewriteRun(
+          javaScript(
+            """
+              class Foo {
+              }
+              """,
+            """
+              /*
+               * Copyright %s the original author or authors.
+               * <p>
+               * 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
+               */
+              class Foo {
+              }
+              """.formatted(getInstance().get(YEAR))
+          )
+        );
+    }
+
+    @Disabled
+    @Test
+    void dontChangeExistingHeader() {
+        rewriteRun(
+          javaScript(
+            """
+              /*
+               * My license header
+               */
+              class Test {
+              }
+              """
+          )
+        );
+    }
+}