use compile-only sourceset for gjf

Author: simschla

lib/build.gradle

@@ -10,6 +10,7 @@ apply from: rootProject.file('gradle/java-publish.gradle')
 def NEEDS_GLUE = [
 	'sortPom',
 	'palantirJavaFormat',
+	'googleJavaFormat',
 	'ktfmt',
 	'ktlint',
 	'flexmark',
@@ -20,11 +21,21 @@ def NEEDS_GLUE = [
 	'cleanthat'
 ]
 for (glue in NEEDS_GLUE) {
-	sourceSets.register(glue) {
+	// main glue
+	def mainGlue = sourceSets.register(glue) {
 		compileClasspath += sourceSets.main.output
 		runtimeClasspath += sourceSets.main.output
 		java {}
 	}
+	// test glue
+	sourceSets.register("test${glue.capitalize()}") {
+		compileClasspath += mainGlue.get().compileClasspath + mainGlue.get().output + sourceSets.test.output
+		runtimeClasspath += mainGlue.get().compileClasspath + mainGlue.get().output + sourceSets.test.output
+		java {}
+	}
+	configurations.named("test${glue.capitalize()}Implementation").configure {
+		extendsFrom(configurations.named("testImplementation").get())
+	}
 }
 
 versionCompatibility {
@@ -70,6 +81,9 @@ dependencies {
 
 	palantirJavaFormatCompileOnly 'com.palantir.javaformat:palantir-java-format:1.1.0' 	// this version needs to stay compilable against Java 8 for CI Job testNpm
 
+	googleJavaFormatCompileOnly 'com.google.googlejavaformat:google-java-format:1.8' // minimum required version for jdk 11
+	testGoogleJavaFormatImplementation "com.diffplug.durian:durian-core:$VER_DURIAN"
+
 	// used jackson-based formatters
 	jacksonCompileOnly 'com.fasterxml.jackson.core:jackson-databind:2.14.2'
 	jacksonCompileOnly 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.14.2'

lib/src/googleJavaFormat/java/com/diffplug/spotless/glue/java/GoogleJavaFormatFormatterFunc.java

@@ -0,0 +1,71 @@
+/*
+ * 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.glue.java;
+
+import static com.diffplug.spotless.glue.java.GoogleJavaFormatUtils.fixWindowsBug;
+
+import java.util.Objects;
+
+import javax.annotation.Nonnull;
+
+import com.google.googlejavaformat.java.Formatter;
+import com.google.googlejavaformat.java.FormatterException;
+import com.google.googlejavaformat.java.ImportOrderer;
+import com.google.googlejavaformat.java.JavaFormatterOptions;
+import com.google.googlejavaformat.java.RemoveUnusedImports;
+import com.google.googlejavaformat.java.StringWrapper;
+
+import com.diffplug.spotless.FormatterFunc;
+
+public class GoogleJavaFormatFormatterFunc implements FormatterFunc {
+
+	@Nonnull
+	private final Formatter formatter;
+
+	@Nonnull
+	private final String version;
+	@Nonnull
+	private final JavaFormatterOptions.Style formatterStyle;
+	private final boolean reflowStrings;
+
+	public GoogleJavaFormatFormatterFunc(@Nonnull String version, @Nonnull String style, boolean reflowStrings) {
+		this.version = Objects.requireNonNull(version);
+		this.formatterStyle = JavaFormatterOptions.Style.valueOf(Objects.requireNonNull(style));
+		this.reflowStrings = reflowStrings;
+
+		this.formatter = new Formatter(JavaFormatterOptions.builder()
+				.style(formatterStyle)
+				.build());
+	}
+
+	@Override
+	@Nonnull
+	public String apply(@Nonnull String input) throws Exception {
+		String formatted = formatter.formatSource(input);
+		String removedUnused = RemoveUnusedImports.removeUnusedImports(formatted);
+		String sortedImports = ImportOrderer.reorderImports(removedUnused, formatterStyle);
+		String reflowedLongStrings = reflowLongStrings(sortedImports);
+		return fixWindowsBug(reflowedLongStrings, version);
+	}
+
+	private String reflowLongStrings(String input) throws FormatterException {
+		if (reflowStrings) {
+			return StringWrapper.wrap(input, formatter);
+		} else {
+			return input;
+		}
+	}
+}

lib/src/googleJavaFormat/java/com/diffplug/spotless/glue/java/GoogleJavaFormatRemoveUnusedImporterFormatterFunc.java

@@ -0,0 +1,43 @@
+/*
+ * 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.glue.java;
+
+import static com.diffplug.spotless.glue.java.GoogleJavaFormatUtils.fixWindowsBug;
+
+import java.util.Objects;
+
+import javax.annotation.Nonnull;
+
+import com.google.googlejavaformat.java.RemoveUnusedImports;
+
+import com.diffplug.spotless.FormatterFunc;
+
+public class GoogleJavaFormatRemoveUnusedImporterFormatterFunc implements FormatterFunc {
+
+	@Nonnull
+	private final String version;
+
+	public GoogleJavaFormatRemoveUnusedImporterFormatterFunc(@Nonnull String version) {
+		this.version = Objects.requireNonNull(version);
+	}
+
+	@Override
+	@Nonnull
+	public String apply(@Nonnull String input) throws Exception {
+		String removedUnused = RemoveUnusedImports.removeUnusedImports(input);
+		return fixWindowsBug(removedUnused, version);
+	}
+}

lib/src/googleJavaFormat/java/com/diffplug/spotless/glue/java/GoogleJavaFormatUtils.java

@@ -0,0 +1,54 @@
+/*
+ * 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.glue.java;
+
+import com.diffplug.spotless.LineEnding;
+
+public class GoogleJavaFormatUtils {
+
+	private static final boolean IS_WINDOWS = LineEnding.PLATFORM_NATIVE.str().equals("\r\n");
+
+	/**
+	 * google-java-format-1.1's removeUnusedImports does *wacky* stuff on Windows.
+	 * The beauty of normalizing all line endings to unix!
+	 */
+	static String fixWindowsBug(String input, String version) {
+		if (IS_WINDOWS && version.equals("1.1")) {
+			int firstImport = input.indexOf("\nimport ");
+			if (firstImport == 0) {
+				return input;
+			} else if (firstImport > 0) {
+				int numToTrim = 0;
+				char prevChar;
+				do {
+					++numToTrim;
+					prevChar = input.charAt(firstImport - numToTrim);
+				} while (Character.isWhitespace(prevChar) && (firstImport - numToTrim) > 0);
+				if (firstImport - numToTrim == 0) {
+					// import was the very first line, and we'd like to maintain a one-line gap
+					++numToTrim;
+				} else if (prevChar == ';' || prevChar == '/') {
+					// import came after either license or a package declaration
+					--numToTrim;
+				}
+				if (numToTrim > 0) {
+					return input.substring(0, firstImport - numToTrim + 2) + input.substring(firstImport + 1);
+				}
+			}
+		}
+		return input;
+	}
+}