Conditionally apply plugin

build.gradle

apply plugin: 'com.novoda.build-properties'

buildProperties {
    local {
        file rootProject.file('local.properties')
    }
}

apply from: file('utilities.gradle')

maybeApply plugin: 'blah', when: buildProperties.local['applyBlah'].or(true)

utilities.gradle

ext.when = {
    if (it instanceof com.novoda.buildproperties.Entry) {
        return it.boolean
    }
    return it as Boolean
}

ext.maybeApply = { Map<String, ?> options ->
    if (when(options.remove('when'))) {
        logger.log(LogLevel.DEBUG, ">>> '$options.plugin' plugin applied...")
        apply options
    } else {
        logger.log(LogLevel.WARN, ">>>  \n/!\\  '$options.plugin' plugin not applied!  /!\\\n")
    }
}