Pipe linting through the core FormatterStep implementations.

Author: nedtwigg

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 DiffPlug
+ * Copyright 2016-2024 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,8 @@
 package com.diffplug.spotless;
 
 import java.io.File;
+import java.util.List;
 import java.util.Objects;
-import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
@@ -36,14 +36,24 @@ final class FilterByContentPatternFormatterStep extends DelegateFormatterStep {
 	public @Nullable String format(String raw, File file) throws Exception {
 		Objects.requireNonNull(raw, "raw");
 		Objects.requireNonNull(file, "file");
-		Matcher matcher = contentPattern.matcher(raw);
-		if (matcher.find() == (onMatch == OnMatch.INCLUDE)) {
+		if (contentPattern.matcher(raw).find() == (onMatch == OnMatch.INCLUDE)) {
 			return delegateStep.format(raw, file);
 		} else {
 			return raw;
 		}
 	}
 
+	@Override
+	public List<Lint> lint(String raw, File file) throws Exception {
+		Objects.requireNonNull(raw, "raw");
+		Objects.requireNonNull(file, "file");
+		if (contentPattern.matcher(raw).find() == (onMatch == OnMatch.INCLUDE)) {
+			return delegateStep.lint(raw, file);
+		} else {
+			return List.of();
+		}
+	}
+
 	@Override
 	public boolean equals(Object o) {
 		if (this == o) {

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 DiffPlug
+ * Copyright 2016-2024 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 package com.diffplug.spotless;
 
 import java.io.File;
+import java.util.List;
 import java.util.Objects;
 
 import javax.annotation.Nullable;
@@ -39,6 +40,17 @@ final class FilterByFileFormatterStep extends DelegateFormatterStep {
 		}
 	}
 
+	@Override
+	public List<Lint> lint(String content, File file) throws Exception {
+		Objects.requireNonNull(content, "content");
+		Objects.requireNonNull(file, "file");
+		if (filter.accept(file)) {
+			return delegateStep.lint(content, file);
+		} else {
+			return List.of();
+		}
+	}
+
 	@Override
 	public boolean equals(Object o) {
 		if (this == o) {

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

@@ -18,6 +18,7 @@
 import java.io.File;
 import java.io.Serializable;
 import java.util.Arrays;
+import java.util.List;
 
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 
@@ -48,6 +49,14 @@ public String format(String rawUnix, File file) throws Exception {
 		return formatter.apply(rawUnix, file);
 	}
 
+	@Override
+	public List<Lint> lint(String content, File file) throws Exception {
+		if (formatter == null) {
+			formatter = stateToFormatter(state());
+		}
+		return formatter.lint(content, file);
+	}
+
 	@Override
 	public boolean equals(Object o) {
 		if (o == null) {