port clang-format to maven plugin

plugin-maven/src/main/java/com/diffplug/spotless/maven/cpp/Clang.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2024-2025 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.maven.cpp;
+
+import org.apache.maven.plugins.annotations.Parameter;
+
+import com.diffplug.spotless.FormatterStep;
+import com.diffplug.spotless.cpp.ClangFormatStep;
+import com.diffplug.spotless.maven.FormatterStepConfig;
+import com.diffplug.spotless.maven.FormatterStepFactory;
+
+public class Clang implements FormatterStepFactory {
+	@Parameter
+	private String version;
+
+	@Parameter
+	private String pathToExe;
+
+	@Parameter
+	private String style;
+
+	@Override
+	public FormatterStep newFormatterStep(FormatterStepConfig config) {
+		ClangFormatStep clang = ClangFormatStep.withVersion(version == null ? ClangFormatStep.defaultVersion() : version);
+
+		if (pathToExe != null) {
+			clang = clang.withPathToExe(pathToExe);
+		}
+
+		if (style != null) {
+			clang = clang.withStyle(style);
+		}
+
+		return clang.create();
+	}
+
+}

plugin-maven/src/main/java/com/diffplug/spotless/maven/cpp/Cpp.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 DiffPlug
+ * Copyright 2016-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,6 +40,10 @@ public void addEclipseCdt(EclipseCdt eclipse) {
 		addStepFactory(eclipse);
 	}
 
+	public void addClangFormat(Clang clang) {
+		addStepFactory(clang);
+	}
+
 	@Override
 	public String licenseHeaderDelimiter() {
 		return CppDefaults.DELIMITER_EXPR;

plugin-maven/src/main/java/com/diffplug/spotless/maven/protobuf/Protobuf.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2024 DiffPlug
+ * Copyright 2016-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@
 
 import com.diffplug.common.collect.ImmutableSet;
 import com.diffplug.spotless.maven.FormatterFactory;
+import com.diffplug.spotless.maven.cpp.Clang;
 import com.diffplug.spotless.maven.generic.LicenseHeader;
 
 /**
@@ -49,4 +50,8 @@ public String licenseHeaderDelimiter() {
 	public void addBuf(Buf buf) {
 		addStepFactory(buf);
 	}
+
+	public void addClang(Clang clang) {
+		addStepFactory(clang);
+	}
 }

plugin-maven/src/test/java/com/diffplug/spotless/maven/cpp/ClangMavenIntegrationTest.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2024-2025 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.maven.cpp;
+
+import org.junit.jupiter.api.Test;
+
+import com.diffplug.spotless.maven.MavenIntegrationHarness;
+import com.diffplug.spotless.tag.ClangTest;
+
+@ClangTest
+class ClangMavenIntegrationTest extends MavenIntegrationHarness {
+
+	@Test
+	@ClangTest
+	void csharp() throws Exception {
+		writePomWithCppSteps("<includes>", "<include>", "src/**/*.cs", "</include>", "</includes>",
+				"<clangFormat>", "<version>", "14.0.0-1ubuntu1.1", "</version>", "</clangFormat>");
+		setFile("src/test.cs").toResource("clang/example.cs");
+		mavenRunner().withArguments("spotless:apply").runNoError();
+		assertFile("src/test.cs").sameAsResource("clang/example.cs.clean");
+	}
+
+	@Test
+	@ClangTest
+	void proto() throws Exception {
+		writePomWithCppSteps("<includes>", "<include>", "**/*.proto", "</include>", "</includes>",
+				"<clangFormat>", "<version>", "14.0.0-1ubuntu1.1", "</version>", "</clangFormat>");
+		setFile("buf.proto").toResource("protobuf/buf/buf.proto");
+		mavenRunner().withArguments("spotless:apply").runNoError();
+		assertFile("buf.proto").sameAsResource("protobuf/buf/buf.proto.clean");
+	}
+
+}