mvn spotless:apply now prints out statistics

lib/src/main/java/com/diffplug/spotless/Formatter.java

@@ -39,13 +39,16 @@
 public final class Formatter implements Serializable, AutoCloseable {
  private static final long serialVersionUID = 1L;
 
+ // The name is used for logging purpose. It does not convey any applicative purpose
+ private String name;
  private LineEnding.Policy lineEndingsPolicy;
  private Charset encoding;
  private Path rootDir;
  private List<FormatterStep> steps;
  private FormatExceptionPolicy exceptionPolicy;
 
- private Formatter(LineEnding.Policy lineEndingsPolicy, Charset encoding, Path rootDirectory, List<FormatterStep> steps, FormatExceptionPolicy exceptionPolicy) {
+ private Formatter(String name, LineEnding.Policy lineEndingsPolicy, Charset encoding, Path rootDirectory, List<FormatterStep> steps, FormatExceptionPolicy exceptionPolicy) {
+ this.name = name;
  this.lineEndingsPolicy = Objects.requireNonNull(lineEndingsPolicy, "lineEndingsPolicy");
  this.encoding = Objects.requireNonNull(encoding, "encoding");
  this.rootDir = Objects.requireNonNull(rootDirectory, "rootDir");
@@ -55,6 +58,7 @@ private Formatter(LineEnding.Policy lineEndingsPolicy, Charset encoding, Path ro
 
  // override serialize output
  private void writeObject(ObjectOutputStream out) throws IOException {
+ out.writeObject(name);
  out.writeObject(lineEndingsPolicy);
  out.writeObject(encoding.name());
  out.writeObject(rootDir.toString());
@@ -65,6 +69,7 @@ private void writeObject(ObjectOutputStream out) throws IOException {
  // override serialize input
  @SuppressWarnings("unchecked")
  private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
+ name = (String) in.readObject();
  lineEndingsPolicy = (LineEnding.Policy) in.readObject();
  encoding = Charset.forName((String) in.readObject());
  rootDir = Paths.get((String) in.readObject());
@@ -78,6 +83,10 @@ private void readObjectNoData() throws ObjectStreamException {
  throw new UnsupportedOperationException();
  }
 
+ public String getName() {
+ return name;
+ }
+
  public LineEnding.Policy getLineEndingsPolicy() {
  return lineEndingsPolicy;
  }
@@ -103,6 +112,8 @@ public static Formatter.Builder builder() {
  }
 
  public static class Builder {
+ // optional parameters
+ private String name = "unnamed";
  // required parameters
  private LineEnding.Policy lineEndingsPolicy;
  private Charset encoding;
@@ -112,6 +123,11 @@ public static class Builder {
 
  private Builder() {}
 
+ public Builder name(String name) {
+ this.name = name;
+ return this;
+ }
+
  public Builder lineEndingsPolicy(LineEnding.Policy lineEndingsPolicy) {
  this.lineEndingsPolicy = lineEndingsPolicy;
  return this;
@@ -138,7 +154,7 @@ public Builder exceptionPolicy(FormatExceptionPolicy exceptionPolicy) {
  }
 
  public Formatter build() {
- return new Formatter(lineEndingsPolicy, encoding, rootDir, steps,
+ return new Formatter(name, lineEndingsPolicy, encoding, rootDir, steps,
  exceptionPolicy == null ? FormatExceptionPolicy.failOnlyOnError() : exceptionPolicy);
  }
  }
@@ -253,6 +269,7 @@ public String compute(String unix, File file) {
  public int hashCode() {
  final int prime = 31;
  int result = 1;
+ result = prime * result + name.hashCode();
  result = prime * result + encoding.hashCode();
  result = prime * result + lineEndingsPolicy.hashCode();
  result = prime * result + rootDir.hashCode();
@@ -273,7 +290,8 @@ public boolean equals(Object obj) {
  return false;
  }
  Formatter other = (Formatter) obj;
- return encoding.equals(other.encoding) &&
+ return name.equals(other.name) &&
+ encoding.equals(other.encoding) &&
  lineEndingsPolicy.equals(other.lineEndingsPolicy) &&
  rootDir.equals(other.rootDir) &&
  steps.equals(other.steps) &&

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2021 DiffPlug
+ * Copyright 2020-2023 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -184,6 +184,7 @@ String formatName() {
 
  Formatter buildFormatter() {
  return Formatter.builder()
+ .name(formatName())
  .lineEndingsPolicy(lineEndingsPolicy.get())
  .encoding(Charset.forName(encoding))
  .rootDir(getProjectDir().get().getAsFile().toPath())

plugin-maven/CHANGES.md

@@ -3,6 +3,8 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
+### Added
+* A synthesis log with the number of considered files is added after each formatter execution ([#1507](https://github.com/diffplug/spotless/pull/1507))
 
 ## [2.31.0] - 2023-01-26
 ### Added

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 DiffPlug
+ * Copyright 2016-2023 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -101,7 +101,9 @@ public final Formatter newFormatter(Supplier<Iterable<File>> filesToFormat, Form
  formatterSteps.add(pair.out());
  }
 
+ String formatterName = this.getClass().getSimpleName();
  return Formatter.builder()
+ .name(formatterName)
  .encoding(formatterEncoding)
  .lineEndingsPolicy(formatterLineEndingPolicy)
  .exceptionPolicy(new FormatExceptionPolicyStrict())

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

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023 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;
+
+/**
+ * Tracks the number of processed files, typically by a single Formatter for a whole repository
+ */
+class ImpactedFilesTracker {
+ protected int nbskippedAsCleanCache = 0;
+ protected int nbCheckedButAlreadyClean = 0;
+ protected int nbCleaned = 0;
+
+ /**
+ * Some cache mechanism may indicate some content is clean, without having to execute the cleaning process
+ */
+ public void skippedAsCleanCache() {
+ nbskippedAsCleanCache++;
+ }
+
+ public int getSkippedAsCleanCache() {
+ return nbskippedAsCleanCache;
+ }
+
+ public void checkedButAlreadyClean() {
+ nbCheckedButAlreadyClean++;
+ }
+
+ public int getCheckedButAlreadyClean() {
+ return nbCheckedButAlreadyClean;
+ }
+
+ public void cleaned() {
+ nbCleaned++;
+ }
+
+ public int getCleaned() {
+ return nbCleaned;
+ }
+
+ public int getTotal() {
+ return nbskippedAsCleanCache + nbCheckedButAlreadyClean + nbCleaned;
+ }
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 DiffPlug
+ * Copyright 2016-2023 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,8 +33,11 @@ public class SpotlessApplyMojo extends AbstractSpotlessMojo {
 
  @Override
  protected void process(Iterable<File> files, Formatter formatter, UpToDateChecker upToDateChecker) throws MojoExecutionException {
+ ImpactedFilesTracker counter = new ImpactedFilesTracker();
+
  for (File file : files) {
  if (upToDateChecker.isUpToDate(file.toPath())) {
+ counter.skippedAsCleanCache();
  if (getLog().isDebugEnabled()) {
  getLog().debug("Spotless will not format an up-to-date file: " + file);
  }
@@ -44,14 +47,26 @@ protected void process(Iterable<File> files, Formatter formatter, UpToDateChecke
  try {
  PaddedCell.DirtyState dirtyState = PaddedCell.calculateDirtyState(formatter, file);
  if (!dirtyState.isClean() && !dirtyState.didNotConverge()) {
+ getLog().info(String.format("Writing clean file: %s", file));
  dirtyState.writeCanonicalTo(file);
  buildContext.refresh(file);
+ counter.cleaned();
+ } else {
+ counter.checkedButAlreadyClean();
  }
  } catch (IOException e) {
  throw new MojoExecutionException("Unable to format file " + file, e);
  }
 
  upToDateChecker.setUpToDate(file.toPath());
  }
+
+ // We print the number of considered files which is useful when ratchetFrom is setup
+ if (counter.getTotal() > 0) {
+ getLog().info(String.format("Spotless.%s is keeping %s files clean - %s were changed to be clean, %s were already clean, %s were skipped because caching determined they were already clean",
+ formatter.getName(), counter.getTotal(), counter.getCleaned(), counter.getCheckedButAlreadyClean(), counter.getSkippedAsCleanCache()));
+ } else {
+ getLog().warn(String.format("Spotless.%s has no target files. Examine your `<includes>`: https://github.com/diffplug/spotless/tree/main/plugin-maven#quickstart", formatter.getName()));
+ }
  }
 }

testlib/src/main/java/com/diffplug/spotless/StepHarnessWithFile.java

@@ -38,6 +38,7 @@ private StepHarnessWithFile(ResourceHarness harness, Formatter formatter) {
  /** Creates a harness for testing steps which do depend on the file. */
  public static StepHarnessWithFile forStep(ResourceHarness harness, FormatterStep step) {
  return new StepHarnessWithFile(harness, Formatter.builder()
+ .name(step.getName())
  .encoding(StandardCharsets.UTF_8)
  .lineEndingsPolicy(LineEnding.UNIX.createPolicy())
  .steps(Collections.singletonList(step))