Automatically add `dagger.formatGeneratedSource` if `dagger-compiler` is present in `annotationProcessor` configuration.

build.gradle

allProjects { project ->
	tasks.withType(JavaCompile).configureEach { JavaCompile task ->
		task.doFirst {
			// annotationProcessorPath is populated around afterEvaluate, but can't use that in configureEach
			if (hasDagger(task.options.annotationProcessorPath)) {
				task.options.compilerArgs += [
					// disable formatting, why wait if it looks almost the same?!
					'-Adagger.formatGeneratedSource=disabled'
				]
			}
		}
	}
}

static def hasDagger(FileCollection files) {
	if (files instanceof Configuration) {
		def config = files as Configuration
		return config.allDependencies
				.any { it.group == 'com.google.dagger' && it.name == 'dagger-compiler' }
	} else {
		return files.files
				.any { it.name.matches(/dagger-compiler-.*\.jar/) }
	}
}