/
ScalaFmtStep.java
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/
ScalaFmtStep.java
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/*
* 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.
* 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.scala;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.util.Collections;
import javax.annotation.Nullable;
import com.diffplug.spotless.FileSignature;
import com.diffplug.spotless.FormatterFunc;
import com.diffplug.spotless.FormatterStep;
import com.diffplug.spotless.JarState;
import com.diffplug.spotless.Provisioner;
/** Wraps up <a href="https://github.com/scalameta/scalafmt">scalafmt</a> as a FormatterStep. */
public class ScalaFmtStep implements java.io.Serializable {
private static final long serialVersionUID = 1L;
static final String DEFAULT_VERSION = "3.7.3";
private static final String DEFAULT_SCALA_MAJOR_VERSION = "2.13";
private static final String NAME = "scalafmt";
private static final String MAVEN_COORDINATE = "org.scalameta:scalafmt-core_";
private final JarState.Promised jarState;
@Nullable
private final File configFile;
private ScalaFmtStep(JarState.Promised jarState, @Nullable File configFile) {
this.jarState = jarState;
this.configFile = configFile;
}
public static FormatterStep create(Provisioner provisioner) {
return create(defaultVersion(), defaultScalaMajorVersion(), provisioner, null);
}
public static FormatterStep create(String version, Provisioner provisioner, @Nullable File configFile) {
return create(version, defaultScalaMajorVersion(), provisioner, configFile);
}
public static FormatterStep create(String version, @Nullable String scalaMajorVersion, Provisioner provisioner, @Nullable File configFile) {
String finalScalaMajorVersion = scalaMajorVersion == null ? DEFAULT_SCALA_MAJOR_VERSION : scalaMajorVersion;
return FormatterStep.create(NAME,
new ScalaFmtStep(JarState.promise(() -> JarState.from(MAVEN_COORDINATE + finalScalaMajorVersion + ":" + version, provisioner)), configFile),
ScalaFmtStep::equalityState,
State::createFormat);
}
public static String defaultVersion() {
return DEFAULT_VERSION;
}
public static String defaultScalaMajorVersion() {
return DEFAULT_SCALA_MAJOR_VERSION;
}
private State equalityState() throws IOException {
return new State(jarState.get(), configFile);
}
private static final class State implements Serializable {
private static final long serialVersionUID = 1L;
private final JarState jarState;
private final FileSignature configSignature;
State(JarState jarState, @Nullable File configFile) throws IOException {
this.jarState = jarState;
this.configSignature = FileSignature.signAsList(configFile == null ? Collections.emptySet() : Collections.singleton(configFile));
}
FormatterFunc createFormat() throws Exception {
final ClassLoader classLoader = jarState.getClassLoader();
final Class<?> formatterFunc = classLoader.loadClass("com.diffplug.spotless.glue.scalafmt.ScalafmtFormatterFunc");
final Constructor<?> constructor = formatterFunc.getConstructor(FileSignature.class);
return (FormatterFunc) constructor.newInstance(this.configSignature);
}
}
}