Improve prettier's exception to be lint-friendly.

Author: nedtwigg

lib/src/main/java/com/diffplug/spotless/npm/PrettierMissingParserException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 DiffPlug
+ * Copyright 2023-2024 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,12 +19,15 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
 import javax.annotation.Nonnull;
 
-class PrettierMissingParserException extends RuntimeException {
+import com.diffplug.spotless.Lint;
+
+class PrettierMissingParserException extends RuntimeException implements Lint.Has {
 	private static final long serialVersionUID = 1L;
 
 	private static final Map<String, String> EXTENSIONS_TO_PLUGINS;
@@ -87,6 +90,11 @@ public PrettierMissingParserException(@Nonnull File file, Exception cause) {
 		this.file = Objects.requireNonNull(file);
 	}
 
+	@Override
+	public List<Lint> getLints() {
+		return List.of(Lint.atUndefinedLine("no-parser", "Could not infer a parser. Maybe you need to include a prettier plugin in devDependencies? e.g. " + recommendPlugin(file)));
+	}
+
 	private static String recommendPlugin(File file) {
 		String pluginName = guessPlugin(file);
 		return "A good candidate for file '" + file + "' is '" + pluginName + "\n"

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

@@ -226,7 +226,7 @@ void suggestsMissingJavaCommunityPlugin(String prettierVersion) throws IOExcepti
 				"}");
 		setFile("JavaTest.java").toResource("npm/prettier/plugins/java-test.dirty");
 		final BuildResult spotlessApply = gradleRunner().withArguments("--stacktrace", "spotlessApply").buildAndFail();
-		Assertions.assertThat(spotlessApply.getOutput()).contains("could not infer a parser");
+		Assertions.assertThat(spotlessApply.getOutput()).contains("Could not infer a parser");
 		Assertions.assertThat(spotlessApply.getOutput()).contains("prettier-plugin-java");
 	}