Added support for generic NativeCmd step

lib/src/main/java/com/diffplug/spotless/generic/NativeCmdStep.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2021 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.generic;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+import com.diffplug.spotless.FormatterFunc;
+import com.diffplug.spotless.FormatterStep;
+import com.diffplug.spotless.ProcessRunner;
+
+public class NativeCmdStep {
+	// prevent direct instantiation
+	private NativeCmdStep() {}
+
+	public static FormatterStep create(String name, String pathToExe, List<String> arguments) {
+		Objects.requireNonNull(name, "name");
+		Objects.requireNonNull(pathToExe, "pathToExe");
+		List<String> argumentsWithPathToExe = new ArrayList<>();
+		argumentsWithPathToExe.add(pathToExe);
+		if (arguments != null) {
+			argumentsWithPathToExe.addAll(arguments);
+		}
+		return FormatterStep.createLazy(name, () -> new State(pathToExe, argumentsWithPathToExe), State::toFunc);
+	}
+
+	static class State implements Serializable {
+		private static final long serialVersionUID = 1L;
+
+		final String pathToExe;
+
+		final List<String> arguments;
+
+		State(String pathToExe, List<String> arguments) {
+			this.pathToExe = pathToExe;
+			this.arguments = arguments;
+		}
+
+		String format(ProcessRunner runner, String input) throws IOException, InterruptedException {
+			return runner.exec(input.getBytes(StandardCharsets.UTF_8), arguments).assertExitZero(StandardCharsets.UTF_8);
+		}
+
+		FormatterFunc.Closeable toFunc() {
+			ProcessRunner runner = new ProcessRunner();
+			return FormatterFunc.Closeable.of(runner, this::format);
+		}
+	}
+}

plugin-maven/src/main/java/com/diffplug/spotless/maven/FormatterFactory.java

@@ -118,6 +118,10 @@ public final void addReplace(Replace replace) {
 		addStepFactory(replace);
 	}
 
+	public final void addNativeCmd(NativeCmd nativeCmd) {
+		addStepFactory(nativeCmd);
+	}
+
 	public final void addReplaceRegex(ReplaceRegex replaceRegex) {
 		addStepFactory(replaceRegex);
 	}

plugin-maven/src/main/java/com/diffplug/spotless/maven/generic/NativeCmd.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2021 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.generic;
+
+import java.util.List;
+
+import org.apache.maven.plugins.annotations.Parameter;
+
+import com.diffplug.spotless.FormatterStep;
+import com.diffplug.spotless.generic.NativeCmdStep;
+import com.diffplug.spotless.maven.FormatterStepConfig;
+import com.diffplug.spotless.maven.FormatterStepFactory;
+
+public class NativeCmd implements FormatterStepFactory {
+
+	@Parameter
+	private String name;
+
+	@Parameter
+	private String pathToExe;
+
+	@Parameter
+	private List<String> arguments;
+
+	@Override
+	public FormatterStep newFormatterStep(FormatterStepConfig config) {
+		if (name == null || pathToExe == null) {
+			throw new IllegalArgumentException("Must specify 'name' and 'pathToExe'.");
+		}
+
+		return NativeCmdStep.create(name, pathToExe, arguments);
+	}
+}

plugin-maven/src/test/java/com/diffplug/spotless/maven/generic/NativeCmdTest.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2021 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.generic;
+
+import org.junit.Test;
+
+import com.diffplug.spotless.maven.MavenIntegrationHarness;
+
+public class NativeCmdTest extends MavenIntegrationHarness {
+
+	@Test
+	public void fromStdOutToStdOut() throws Exception {
+		writePomWithFormatSteps(
+				"<nativeCmd>",
+				"  <name>Greetings to Mars</name>",
+				"  <pathToExe>sed</pathToExe>",
+				"  <arguments>" +
+						"    <argument>s/World/Mars/g</argument>" +
+						"  </arguments>",
+				"</nativeCmd>");
+		runTest("Hello World", "Hello Mars");
+	}
+
+	private void runTest(String sourceContent, String targetContent) throws Exception {
+		String path = "src/main/java/test.java";
+		setFile(path).toContent(sourceContent);
+		mavenRunner().withArguments("spotless:apply").runNoError();
+		assertFile(path).hasContent(targetContent);
+	}
+}