Duplicate `clean` task

[AllanWang]

As of spotless 3.27.0, it seems like a clean task is created. I'm not sure about now, but at least a year ago, all new projects had a clean task created by the IDE by default:

task clean(type: Delete) {
    delete rootProject.buildDir
}

The fix for us is to remove the inline clean task.

If this is expected, consider adding this in the changelog. If this is not expected, can we avoid the naming conflict somehow?

[nedtwigg]

This is where we "create" the clean task:

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

Lines 31 to 38 in c007dba

	// make sure there's a `clean` task
	project.getPlugins().apply(BasePlugin.class);
	// setup the extension
	spotlessExtension = project.getExtensions().create(SpotlessExtension.EXTENSION, SpotlessExtension.class, project);
	// clear spotless' cache when the user does a clean
	Task clean = project.getTasks().getByName(BasePlugin.CLEAN_TASK_NAME);

I think the way we're doing it now is the conventional way which plays nice with other plugins. I think it would look like this for your example

apply plugin: BasePlugin
tasks.getByName(BasePlugin.CLEAN_TASK_NAME).doLast {
    delete rootProject.buildDir
}

[AllanWang]

Can this be better documented? I'm fine with it, but it basically creates an error for any project that kept the default template until a change is made

[nedtwigg]

A quick git blame shows that the line I linked to above is at least 2 years old, and it looks like BasePlugin has worked this way since Gradle 2.0. In my faulty memory, this is the way that I've always created or hooked the clean task in plugins and buildscripts, so I don't remember a change, and I try to be thorough in the changelog. I'm happy to merge a PR which updates the documentation or changelog to help others in your situation. Having this issue in the search will be helpful to others who have that same IDE template too, so you've already provided a service to the project even if you don't have time for a PR :)

[nedtwigg]

Happy to reopen if there's further action or discussion to be had.