Initial version of Spotless Maven plugin

.travis.yml

@@ -1,11 +1,16 @@
 language: java
 jdk:
 - oraclejdk8
-script: "./.ci/ci.sh"
+install: true
+script:
+  - ./.ci/ci.sh
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+  - rm -fr plugin-maven/build/localMavenRepository/com/diffplug/spotless/
 cache:
   directories:
   - $HOME/.gradle/caches/
   - $HOME/.gradle/wrapper/
+  - $HOME/.m2/
+  - plugin-maven/build/localMavenRepository/

README.md

@@ -34,18 +34,18 @@ output = [
 '| --------------------------------------------- | ------------- | ------------ | --------|',
 lib('generic.EndWithNewlineStep')                +'{{yes}}       | {{no}}       | {{no}}  |',
 lib('generic.IndentStep')                        +'{{yes}}       | {{no}}       | {{no}}  |',
-lib('generic.LicenseHeaderStep')                 +'{{yes}}       | {{no}}       | {{no}}  |',
+lib('generic.LicenseHeaderStep')                 +'{{yes}}       | {{yes}}      | {{no}}  |',
 lib('generic.ReplaceRegexStep')                  +'{{yes}}       | {{no}}       | {{no}}  |',
 lib('generic.ReplaceStep')                       +'{{yes}}       | {{no}}       | {{no}}  |',
 lib('generic.TrimTrailingWhitespaceStep')        +'{{yes}}       | {{no}}       | {{no}}  |',
 extra('groovy.GrEclipseFormatterStep')           +'{{yes}}       | {{no}}       | {{no}}  |',
-lib('java.GoogleJavaFormatStep')                 +'{{yes}}       | {{no}}       | {{no}}  |',
-lib('java.ImportOrderStep')                      +'{{yes}}       | {{no}}       | {{no}}  |',
-lib('java.RemoveUnusedImportsStep')              +'{{yes}}       | {{no}}       | {{no}}  |',
-extra('java.EclipseFormatterStep')               +'{{yes}}       | {{no}}       | {{no}}  |',
+lib('java.GoogleJavaFormatStep')                 +'{{yes}}       | {{yes}}      | {{no}}  |',
+lib('java.ImportOrderStep')                      +'{{yes}}       | {{yes}}      | {{no}}  |',
+lib('java.RemoveUnusedImportsStep')              +'{{yes}}       | {{yes}}      | {{no}}  |',
+extra('java.EclipseFormatterStep')               +'{{yes}}       | {{yes}}      | {{no}}  |',
 lib('kotlin.KtLintStep')                         +'{{yes}}       | {{no}}       | {{no}}  |',
 lib('markdown.FreshMarkStep')                    +'{{yes}}       | {{no}}       | {{no}}  |',
-lib('scala.ScalaFmtStep')                        +'{{yes}}       | {{no}}       | {{no}}  |',
+lib('scala.ScalaFmtStep')                        +'{{yes}}       | {{yes}}       | {{no}}  |',
 lib('sql.DBeaverSQLFormatterStep')               +'{{yes}}       | {{no}}       | {{no}}  |',
 '| [(Your FormatterStep here)](https://github.com/nedtwigg/spotless/blob/markdown-preview-temp/CONTRIBUTING.md#how-to-add-a-new-formatterstep) | {{no}}        | {{no}}       | {{no}}  |',
 '| Fast up-to-date checking                      | {{yes}}       | {{no}}       | {{no}}  |',
@@ -57,18 +57,18 @@ lib('sql.DBeaverSQLFormatterStep')               +'{{yes}}       | {{no}}
 | --------------------------------------------- | ------------- | ------------ | --------|
 | [`generic.EndWithNewlineStep`](lib/src/main/java/com/diffplug/spotless/generic/EndWithNewlineStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
 | [`generic.IndentStep`](lib/src/main/java/com/diffplug/spotless/generic/IndentStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
-| [`generic.LicenseHeaderStep`](lib/src/main/java/com/diffplug/spotless/generic/LicenseHeaderStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
+| [`generic.LicenseHeaderStep`](lib/src/main/java/com/diffplug/spotless/generic/LicenseHeaderStep.java) | :+1:       | :+1:      | :white_large_square:  |
 | [`generic.ReplaceRegexStep`](lib/src/main/java/com/diffplug/spotless/generic/ReplaceRegexStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
 | [`generic.ReplaceStep`](lib/src/main/java/com/diffplug/spotless/generic/ReplaceStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
 | [`generic.TrimTrailingWhitespaceStep`](lib/src/main/java/com/diffplug/spotless/generic/TrimTrailingWhitespaceStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
 | [`groovy.GrEclipseFormatterStep`](lib-extra/src/main/java/com/diffplug/spotless/extra/groovy/GrEclipseFormatterStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
-| [`java.GoogleJavaFormatStep`](lib/src/main/java/com/diffplug/spotless/java/GoogleJavaFormatStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
-| [`java.ImportOrderStep`](lib/src/main/java/com/diffplug/spotless/java/ImportOrderStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
-| [`java.RemoveUnusedImportsStep`](lib/src/main/java/com/diffplug/spotless/java/RemoveUnusedImportsStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
-| [`java.EclipseFormatterStep`](lib-extra/src/main/java/com/diffplug/spotless/extra/java/EclipseFormatterStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
+| [`java.GoogleJavaFormatStep`](lib/src/main/java/com/diffplug/spotless/java/GoogleJavaFormatStep.java) | :+1:       | :+1:      | :white_large_square:  |
+| [`java.ImportOrderStep`](lib/src/main/java/com/diffplug/spotless/java/ImportOrderStep.java) | :+1:       | :+1:      | :white_large_square:  |
+| [`java.RemoveUnusedImportsStep`](lib/src/main/java/com/diffplug/spotless/java/RemoveUnusedImportsStep.java) | :+1:       | :+1:      | :white_large_square:  |
+| [`java.EclipseFormatterStep`](lib-extra/src/main/java/com/diffplug/spotless/extra/java/EclipseFormatterStep.java) | :+1:       | :+1:      | :white_large_square:  |
 | [`kotlin.KtLintStep`](lib/src/main/java/com/diffplug/spotless/kotlin/KtLintStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
 | [`markdown.FreshMarkStep`](lib/src/main/java/com/diffplug/spotless/markdown/FreshMarkStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
-| [`scala.ScalaFmtStep`](lib/src/main/java/com/diffplug/spotless/scala/ScalaFmtStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
+| [`scala.ScalaFmtStep`](lib/src/main/java/com/diffplug/spotless/scala/ScalaFmtStep.java) | :+1:       | :+1:       | :white_large_square:  |
 | [`sql.DBeaverSQLFormatterStep`](lib/src/main/java/com/diffplug/spotless/sql/DBeaverSQLFormatterStep.java) | :+1:       | :white_large_square:       | :white_large_square:  |
 | [(Your FormatterStep here)](https://github.com/nedtwigg/spotless/blob/markdown-preview-temp/CONTRIBUTING.md#how-to-add-a-new-formatterstep) | :white_large_square:        | :white_large_square:       | :white_large_square:  |
 | Fast up-to-date checking                      | :+1:       | :white_large_square:       | :white_large_square:  |
@@ -77,6 +77,7 @@ lib('sql.DBeaverSQLFormatterStep')               +'{{yes}}       | {{no}}
 
 ## Acknowledgements
 
+* Thanks to [Konstantin Lutovich](https://github.com/lutovich) for [implementing the maven plugin](https://github.com/diffplug/spotless/pull/188).
 * Thanks to [Baptiste Mesta](https://github.com/baptistemesta) for
   + porting the DBeaver formatter to Spotless, and thanks to [DBeaver](https://dbeaver.jkiss.org/) and [its authors](https://github.com/serge-rider/dbeaver/graphs/contributors) for their excellent SQL formatter.
   + making license headers date-aware [#180](https://github.com/diffplug/spotless/pull/180)

gradle.properties

@@ -12,7 +12,8 @@ artifactIdTestLib=spotless-testlib
 
 versionMaven=1.0.0-SNAPSHOT
 stableMaven=unreleased
-artifactIdMaven=spotless-plugin-maven
+# naming convention '-maven-plugin' allows mvn 'spotless:check' instead of 'spotless-plugin-maven:check'
+artifactIdMaven=spotless-maven-plugin
 
 versionGradle=3.9.0-SNAPSHOT
 stableGradle=3.8.0
@@ -31,3 +32,9 @@ VER_PEGDOWN_DOCLET=1.3
 VER_DURIAN=1.2.0
 VER_JUNIT=4.12
 VER_ASSERTJ=3.5.2
+VER_MOCKITO=2.13.0
+
+# Used for Maven Plugin
+VER_MAVEN_API=3.0
+VER_ECLIPSE_AETHER=1.1.0
+VER_MUSTACHE=0.9.5

gradle/java-publish.gradle

@@ -98,6 +98,13 @@ model {
 							}
 						}
 						developers {
+							if (project.ext.artifactId == 'spotless-plugin-maven') {
+								developer {
+									id 'lutovich'
+									name 'Konstantin Lutovich'
+									email 'konstantin.lutovich@neotechnology.com'
+								}
+							}
 							developer {
 								id 'nedtwigg'
 								name 'Ned Twigg'

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/DiffMessageFormatter.java → lib-extra/src/main/java/com/diffplug/spotless/extra/integration/DiffMessageFormatter.java

@@ -13,16 +13,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package com.diffplug.gradle.spotless;
+package com.diffplug.spotless.extra.integration;
 
 import java.io.ByteArrayOutputStream;
 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.util.List;
 import java.util.ListIterator;
+import java.util.Objects;
 
 import org.eclipse.jgit.diff.DiffFormatter;
 import org.eclipse.jgit.diff.EditList;
@@ -31,48 +31,89 @@
 import org.eclipse.jgit.diff.RawTextComparator;
 
 import com.diffplug.common.base.CharMatcher;
+import com.diffplug.common.base.Errors;
 import com.diffplug.common.base.Preconditions;
 import com.diffplug.common.base.Splitter;
 import com.diffplug.spotless.Formatter;
 import com.diffplug.spotless.LineEnding;
 import com.diffplug.spotless.PaddedCell;
 
 /** Formats the messages of failed spotlessCheck invocations with a nice diff message. */
-final class DiffMessageFormatter {
-	private static final int MAX_CHECK_MESSAGE_LINES = 50;
-	static final int MAX_FILES_TO_LIST = 10;
-
-	static String messageFor(SpotlessTask task, Formatter formatter, List<File> problemFiles) throws IOException {
-		DiffMessageFormatter diffFormater = new DiffMessageFormatter(task, formatter, problemFiles);
-		return "The following files had format violations:\n"
-				+ diffFormater.buffer
-				+ "Run 'gradlew "
-				+ SpotlessPlugin.EXTENSION
-				+ SpotlessPlugin.APPLY
-				+ "' to fix these violations.";
+public final class DiffMessageFormatter {
+	public static Builder builder() {
+		return new Builder();
+	}
+
+	public static class Builder {
+		private Builder() {}
+
+		private String runToFix;
+		private boolean isPaddedCell;
+		private Formatter formatter;
+		private List<File> problemFiles;
+
+		/** "Run 'gradlew spotlessApply' to fix these violations." */
+		public Builder runToFix(String runToFix) {
+			this.runToFix = Objects.requireNonNull(runToFix);
+			return this;
+		}
+
+		public Builder isPaddedCell(boolean isPaddedCell) {
+			this.isPaddedCell = isPaddedCell;
+			return this;
+		}
+
+		public Builder formatter(Formatter formatter) {
+			this.formatter = Objects.requireNonNull(formatter);
+			return this;
+		}
+
+		public Builder problemFiles(List<File> problemFiles) {
+			this.problemFiles = Objects.requireNonNull(problemFiles);
+			Preconditions.checkArgument(!problemFiles.isEmpty(), "cannot be empty");
+			return this;
+		}
+
+		/** Returns the error message. */
+		public String getMessage() {
+			try {
+				Objects.requireNonNull(runToFix, "runToFix");
+				Objects.requireNonNull(formatter, "formatter");
+				Objects.requireNonNull(problemFiles, "problemFiles");
+				DiffMessageFormatter diffFormater = new DiffMessageFormatter(this);
+				return "The following files had format violations:\n"
+						+ diffFormater.buffer
+						+ runToFix;
+			} catch (IOException e) {
+				throw Errors.asRuntime(e);
+			}
+		}
+
+		String relativePath(File file) {
+			return formatter.getRootDir().relativize(file.toPath()).toString();
+		}
 	}
 
+	private static final int MAX_CHECK_MESSAGE_LINES = 50;
+	public static final int MAX_FILES_TO_LIST = 10;
+
 	private final StringBuilder buffer = new StringBuilder(MAX_CHECK_MESSAGE_LINES * 64);
 	private int numLines = 0;
 
-	private DiffMessageFormatter(SpotlessTask task, Formatter formatter, List<File> problemFiles) throws IOException {
-		Preconditions.checkArgument(!problemFiles.isEmpty(), "Problem files must not be empty");
-
-		Path rootDir = task.getProject().getRootDir().toPath();
-		ListIterator<File> problemIter = problemFiles.listIterator();
+	private DiffMessageFormatter(Builder builder) throws IOException {
+		ListIterator<File> problemIter = builder.problemFiles.listIterator();
 		while (problemIter.hasNext() && numLines < MAX_CHECK_MESSAGE_LINES) {
 			File file = problemIter.next();
-			addFile(rootDir.relativize(file.toPath()) + "\n" +
-					DiffMessageFormatter.diff(task, formatter, file));
+			addFile(builder.relativePath(file) + "\n" + DiffMessageFormatter.diff(builder, file));
 		}
 		if (problemIter.hasNext()) {
-			int remainingFiles = problemFiles.size() - problemIter.nextIndex();
+			int remainingFiles = builder.problemFiles.size() - problemIter.nextIndex();
 			if (remainingFiles >= MAX_FILES_TO_LIST) {
 				buffer.append("Violations also present in ").append(remainingFiles).append(" other files.\n");
 			} else {
 				buffer.append("Violations also present in:\n");
 				while (problemIter.hasNext()) {
-					addIntendedLine(NORMAL_INDENT, rootDir.relativize(problemIter.next().toPath()).toString());
+					addIntendedLine(NORMAL_INDENT, builder.relativePath(problemIter.next()));
 				}
 			}
 		}
@@ -126,19 +167,19 @@ private void addIntendedLine(String indent, String line) {
 	 * look like if formatted using the given formatter. Does not end with any newline
 	 * sequence (\n, \r, \r\n).
 	 */
-	private static String diff(SpotlessTask task, Formatter formatter, File file) throws IOException {
-		String raw = new String(Files.readAllBytes(file.toPath()), formatter.getEncoding());
+	private static String diff(Builder builder, File file) throws IOException {
+		String raw = new String(Files.readAllBytes(file.toPath()), builder.formatter.getEncoding());
 		String rawUnix = LineEnding.toUnix(raw);
 		String formattedUnix;
-		if (task.isPaddedCell()) {
-			formattedUnix = PaddedCell.check(formatter, file, rawUnix).canonical();
+		if (builder.isPaddedCell) {
+			formattedUnix = PaddedCell.check(builder.formatter, file, rawUnix).canonical();
 		} else {
-			formattedUnix = formatter.compute(rawUnix, file);
+			formattedUnix = builder.formatter.compute(rawUnix, file);
 		}
 
 		if (rawUnix.equals(formattedUnix)) {
 			// the formatting is fine, so it's a line-ending issue
-			String formatted = formatter.computeLineEndings(formattedUnix, file);
+			String formatted = builder.formatter.computeLineEndings(formattedUnix, file);
 			return diffWhitespaceLineEndings(raw, formatted, false, true);
 		} else {
 			return diffWhitespaceLineEndings(rawUnix, formattedUnix, true, false);

lib-extra/src/main/java/com/diffplug/spotless/extra/integration/package-info.java

@@ -0,0 +1,10 @@
+/**
+ * Integration code for plugins.
+ */
+@ParametersAreNonnullByDefault
+@ReturnValuesAreNonnullByDefault
+package com.diffplug.spotless.extra.integration;
+
+import javax.annotation.ParametersAreNonnullByDefault;
+
+import com.diffplug.spotless.annotations.ReturnValuesAreNonnullByDefault;

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

@@ -18,7 +18,6 @@
 import static com.diffplug.gradle.spotless.PluginGradlePreconditions.requireElementsNonNull;
 
 import java.io.File;
-import java.io.IOException;
 import java.io.Serializable;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
@@ -45,6 +44,7 @@
 import com.diffplug.spotless.LineEnding;
 import com.diffplug.spotless.PaddedCell;
 import com.diffplug.spotless.PaddedCellBulk;
+import com.diffplug.spotless.extra.integration.DiffMessageFormatter;
 
 public class SpotlessTask extends DefaultTask {
 	// set by SpotlessExtension, but possibly overridden by FormatExtension
@@ -164,7 +164,7 @@ public void performAction(IncrementalTaskInputs inputs) throws Exception {
 		Formatter formatter = Formatter.builder()
 				.lineEndingsPolicy(lineEndingsPolicy)
 				.encoding(Charset.forName(encoding))
-				.rootDir(getProject().getProjectDir().toPath())
+				.rootDir(getProject().getRootDir().toPath())
 				.steps(steps)
 				.exceptionPolicy(exceptionPolicy)
 				.build();
@@ -279,7 +279,12 @@ private void check(Formatter formatter, List<File> outOfDate) throws Exception {
 	}
 
 	/** Returns an exception which indicates problem files nicely. */
-	GradleException formatViolationsFor(Formatter formatter, List<File> problemFiles) throws IOException {
-		return new GradleException(DiffMessageFormatter.messageFor(this, formatter, problemFiles));
+	GradleException formatViolationsFor(Formatter formatter, List<File> problemFiles) {
+		return new GradleException(DiffMessageFormatter.builder()
+				.runToFix("Run 'gradlew spotlessApply' to fix these violations.")
+				.isPaddedCell(paddedCell)
+				.formatter(formatter)
+				.problemFiles(problemFiles)
+				.getMessage());
 	}
 }

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/DiffMessageFormatterTest.java

@@ -33,6 +33,7 @@
 import com.diffplug.spotless.FormatterStep;
 import com.diffplug.spotless.LineEnding;
 import com.diffplug.spotless.ResourceHarness;
+import com.diffplug.spotless.extra.integration.DiffMessageFormatter;
 
 public class DiffMessageFormatterTest extends ResourceHarness {
 	private SpotlessTask create(File... files) throws IOException {

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationTest.java

@@ -37,6 +37,20 @@
 import com.diffplug.spotless.ResourceHarness;
 
 public class GradleIntegrationTest extends ResourceHarness {
+	/**
+	 * Each test gets its own temp folder, and we create a gradle
+	 * build there and run it.
+	 *
+	 * Because those test folders don't have a .gitattributes file,
+	 * git (on windows) will default to \r\n. So now if you read a
+	 * test file from the spotless test resources, and compare it
+	 * to a build result, the line endings won't match.
+	 *
+	 * By sticking this .gitattributes file into the test directory,
+	 * we ensure that the default Spotless line endings policy of
+	 * GIT_ATTRIBUTES will use \n, so that tests match the test
+	 * resources on win and linux.
+	 */
 	@Before
 	public void gitAttributes() throws IOException {
 		write(".gitattributes", "* text eol=lf");