Support using Gradle projects as the dependency inputs

[Goooler]

I'd finished Ktlint custom rule sets support in #1896, but it supports Maven coordinates only due to the limits of

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

Lines 56 to 59 in 0189f71

	/** Provisions the given maven coordinates and their transitive dependencies. */
	public static JarState from(Collection<String> mavenCoordinates, Provisioner provisioner) throws IOException {
	return provisionWithTransitives(true, mavenCoordinates, provisioner);
	}

We can extend this for Gradle local projects to be used as the inputs, not sure if this way works for Maven projects as well.

[Goooler]

Another workable way is using spotless configuration like

dependencies {
  spotless("org.junit.jupiter:junit-jupiter:5.10.0")
  spotless(libs.jupiter)
  spotless(projects.b)
  ...
}

I guess this is an intended behavior of not using it?

[bgaudiosi]

I'm running into this as well. I've created a new rule in the same (gradle) project that I'd like to apply it which doesn't seem possible at the moment.

[RubixDev]

Another workable way is using spotless configuration like

dependencies {
  spotless("org.junit.jupiter:junit-jupiter:5.10.0")
  spotless(libs.jupiter)
  spotless(projects.b)
  ...
}

I guess this is an intended behavior of not using it?

Are you saying there already is such a spotless configuration and it's already possible to use Gradle projects as dependencies? Because if you are, it's not working for me. And I would really like to have this feature.

[Goooler]

Not yet, it's a proposal. There are some issues related to reuse configurations:

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

Lines 116 to 132 in a6d2e61

	Configuration config = configurations.create("spotless"
	+ new Request(withTransitives, mavenCoords).hashCode());
	mavenCoords.stream()
	.map(dependencies::create)
	.forEach(config.getDependencies()::add);
	config.setDescription(mavenCoords.toString());
	config.setTransitive(withTransitives);
	config.setCanBeConsumed(false);
	config.setVisible(false);
	config.attributes(attr -> {
	attr.attribute(Category.CATEGORY_ATTRIBUTE, project.getObjects().named(Category.class, Category.LIBRARY));
	attr.attribute(Bundling.BUNDLING_ATTRIBUTE, project.getObjects().named(Bundling.class, Bundling.EXTERNAL));
	// TODO: This is a copy-paste from org.gradle.api.attributes.java.TargetJvmEnvironment which is added in Gradle 7.0, remove this once we drop support for Gradle 6.x.
	// Add this attribute for resolving Guava dependency, see https://github.com/google/guava/issues/6801.
	attr.attribute(Attribute.of("org.gradle.jvm.environment", String.class), "standard-jvm");
	});
	return config.resolve();

[jisungbin]

@bgaudiosi I'm running into this as well. I've created a new rule in the same (gradle) project that I'd like to apply it which doesn't seem possible at the moment.

I solved this problem by releasing a custom ruleset module to MavenLocal and using it.

[ntkoopman]

It would be great to have a better solution, but as a workaround you can set up a substitution rule in Gradle:

configurations.all {
    resolutionStrategy.dependencySubstitution {
        substitute(module("my:ktlint-rules")).using(project(":ktlint-rules"))
    }
}

tasks.withType(com.diffplug.gradle.spotless.SpotlessTask::class) {
    dependsOn(":ktlint-rules:jar")
}

spotless {
    kotlin {
        ktlint().customRuleSets(listOf("my:ktlint-rules:+"))
    }
}

[Goooler]

Yeah, this is great!