Switched maven plugin over to Formatter.

plugin-maven/src/main/java/com/diffplug/gradle/spotless/SpotlessMojo.java

@@ -15,13 +15,16 @@
  */
 package com.diffplug.gradle.spotless;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Collections.singleton;
 
 import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Stream;
@@ -37,8 +40,11 @@
 import org.eclipse.aether.RepositorySystemSession;
 import org.eclipse.aether.repository.RemoteRepository;
 
+import com.diffplug.spotless.Formatter;
 import com.diffplug.spotless.FormatterStep;
+import com.diffplug.spotless.LineEnding;
 import com.diffplug.spotless.Provisioner;
+import com.diffplug.spotless.ThrowingEx;
 import com.diffplug.spotless.extra.java.EclipseFormatterStep;
 
 @Mojo(name = "spotless")
@@ -62,31 +68,43 @@ public class SpotlessMojo extends AbstractMojo {
 	@Override
 	public void execute() throws MojoExecutionException, MojoFailureException {
 		ArtifactResolver resolver = new ArtifactResolver(repositorySystem, repositorySystemSession, repositories);
-
 		Provisioner provisioner = MavenProvisioner.create(resolver);
+
+		// create the eclipse step
 		Set<File> settingFiles = singleton(new File(eclipseFormatFile));
-		FormatterStep step = EclipseFormatterStep.create(settingFiles, provisioner);
+		FormatterStep step = EclipseFormatterStep.create(EclipseFormatterStep.defaultVersion(),
+				settingFiles, provisioner);
 
+		// collect all the files that are going to be formatted
+		File rootDir = project.getFile();
+		List<File> toFormat = new ArrayList<>();
 		for (String compileSourceRoot : project.getCompileSourceRoots()) {
 			Path root = Paths.get(compileSourceRoot);
 			try (Stream<Path> entries = Files.walk(root)) {
 				entries.filter(Files::isRegularFile)
 						.filter(file -> file.getFileName().toString().endsWith(".java"))
-						.forEach(file -> format(file, step));
+						.map(Path::toFile)
+						.forEach(toFormat::add);
 			} catch (Exception e) {
 				throw new MojoExecutionException("Unable to walk the file tree", e);
 			}
 		}
-	}
 
-	private void format(Path file, FormatterStep step) {
+		// create a formatter
+		Formatter formatter = Formatter.builder()
+				.lineEndingsPolicy(LineEnding.GIT_ATTRIBUTES.createPolicy(rootDir, () -> toFormat))
+				.encoding(StandardCharsets.UTF_8)
+				.rootDir(rootDir.toPath())
+				.steps(Collections.singletonList(step))
+				.build();
+
+		// use the formatter to format all the files
 		try {
-			getLog().info("Formatting " + file);
-			String contents = new String(Files.readAllBytes(file), UTF_8);
-			String formatted = step.format(contents, file.toFile());
-			Files.write(file, formatted.getBytes(UTF_8));
-		} catch (Exception e) {
-			throw new RuntimeException("Unable to format " + file, e);
+			for (File file : toFormat) {
+				formatter.applyTo(file);
+			}
+		} catch (IOException e) {
+			throw ThrowingEx.asRuntime(e);
 		}
 	}
 }