How can I conditionally run code if a Gradle plugin is applied?

Question

I have a script plugin that I would like to:

• Check if the ivy-publish applied (via apply plugin: ivy-publish):
• If it is applied, declare publishing { repositories { ivy { } } }
• If it's not applied, run some other code

However, I'm unsure of how to actually run code if the ivy-publish plugin is applied, and I couldn't find anything about that in the documentation. Is there any way to do this?

Principium

Answer 1

You can use the PluginManager.withPlugin(String id, Action<? super AppliedPlugin> action) method. From the Javadoc:

If a plugin with the specified ID has already been applied, the supplied action will be executed immediately. Otherwise, the action will executed immediately after a plugin with the specified ID is applied.

In your build script you could do something like:

pluginManager.withPlugin('ivy-publish') {
  // Do configuration
}

Chrissa

While both answers are helpful, this one actually wound up being more useful for what we were doing, so I've chosen to accept this. – Principium

actually I don't see that this works when writing your own plugins but is evaluated too early, i.e. no project is found and nothing is applied – Chucho

Answer 2

You can always use findPlugin:

println project.plugins.findPlugin('ivy-publish')

Consensus

There's a problem with findPlugin - if a plugin is applied later in the script findPlugin will fail to find it. – Des

@Des check it in afterEvaluate then. – Consensus

If there are at least two plugins doing this there's really no difference. – Des

Answer 3

Or use:

if (project.getPluginManager().hasPlugin("ivy-publish")) {
    ..
}

Buckboard

The same problem as in @Opal's answer - this is an eager API. – Des