Move CppDefaults.FILE_FILTER to its only user: gradle CppExtension (continuation of #630 and #634). Preserve its eclipse-specific info in the EclipseCdtFormatterStep comments.

Author: nedtwigg

lib-extra/src/main/java/com/diffplug/spotless/extra/cpp/EclipseCdtFormatterStep.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 DiffPlug
+ * Copyright 2016-2020 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,7 +23,13 @@
 import com.diffplug.spotless.extra.EclipseBasedStepBuilder;
 import com.diffplug.spotless.extra.EclipseBasedStepBuilder.State;
 
-/** Formatter step which calls out to the Eclipse CDT formatter. */
+/**
+ * Formatter step which calls out to the Eclipse CDT formatter.
+ *
+ * Eclipse-CDT <code>org.eclipse.core.contenttype.contentTypes</code>
+ * extension <code>cSource</code>, <code>cHeader</code>, <code>cxxSource</code> and <code>cxxHeader</code>.
+ * can handle: "c", "h", "C", "cpp", "cxx", "cc", "c++", "h", "hpp", "hh", "hxx", "inc"
+ */
 public final class EclipseCdtFormatterStep {
 	// prevent direct instantiation
 	private EclipseCdtFormatterStep() {}

lib/src/main/java/com/diffplug/spotless/cpp/CppDefaults.java

@@ -16,27 +16,13 @@
 package com.diffplug.spotless.cpp;
 
 import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
 import java.util.stream.Collectors;
 
 /** Common utilities for C/C++ */
 public class CppDefaults {
 	//Prevent instantiation
 	private CppDefaults() {};
 
-	/** Filtering based on Eclipse-CDT <code>org.eclipse.core.contenttype.contentTypes</code> */
-	/**
-	 * Filter based on Eclipse-CDT <code>org.eclipse.core.contenttype.contentTypes</code>
-	 * extension <code>cSource</code>, <code>cHeader</code>, <code>cxxSource</code> and <code>cxxHeader</code>.
-	 */
-	@Deprecated
-	public static final List<String> FILE_FILTER = Collections.unmodifiableList(
-			Arrays.asList("c", "h", "C", "cpp", "cxx", "cc", "c++", "h", "hpp", "hh", "hxx", "inc")
-					.stream().map(s -> {
-						return "**/*." + s;
-					}).collect(Collectors.toList()));
-
 	/**
 	 * Default delimiter expression shall cover most valid and common starts of C/C++ declarations and definitions.
 	 * Furthermore it shall not conflict with terms commonly used within license headers.

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

@@ -17,6 +17,11 @@
 
 import static com.diffplug.gradle.spotless.PluginGradlePreconditions.requireElementsNonNull;
 
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
 import org.gradle.api.Project;
 
 import com.diffplug.spotless.cpp.CppDefaults;
@@ -79,11 +84,22 @@ protected void setupTask(SpotlessTask task) {
 			 * defined by the CDT plugin.
 			 */
 			noDefaultTarget();
-			target(CppDefaults.FILE_FILTER.toArray());
+			target(FILE_FILTER.toArray());
 		}
 		super.setupTask(task);
 	}
 
+	/**
+	 * Filter based on Eclipse-CDT <code>org.eclipse.core.contenttype.contentTypes</code>
+	 * extension <code>cSource</code>, <code>cHeader</code>, <code>cxxSource</code> and <code>cxxHeader</code>.
+	 */
+	@Deprecated
+	private static final List<String> FILE_FILTER = Collections.unmodifiableList(
+			Arrays.asList("c", "h", "C", "cpp", "cxx", "cc", "c++", "h", "hpp", "hh", "hxx", "inc")
+					.stream().map(s -> {
+						return "**/*." + s;
+					}).collect(Collectors.toList()));
+
 	@Override
 	public LicenseHeaderConfig licenseHeader(String licenseHeader) {
 		return licenseHeader(licenseHeader, CppDefaults.DELIMITER_EXPR);