/**
 * Print value of property provided in "-Pprop" on command line to stdout.
 *
 * Usage Example: ./gradlew -q printProperty -Pprop=rootProject.name
 */
task printProperty {
    doLast {
        // get the "property name" in question from commandline:
        String prop = project.findProperty('prop')
        if (prop == null) {
            return // or use println ...
        }

        // treat as property name:
        Object theProperty = project.findProperty(prop)

        if (null == theProperty) {
            // try to handle provided information as "nested property"
            List<String> thePropPath = prop.split('\\.').toList()

            theProperty = project.findProperty(thePropPath.head())

            // aux. closure to travel "property path"
            def pp = { s, t ->
                if (s != null && s.hasProperty(t).is(true)) {
                    return s.property(t)
                }
                return null
            }
            thePropPath.tail().each { item ->
                theProperty = pp(theProperty, item)
            }
        }
        println(theProperty ?: "") // or print "null" ...
    }
}

/**
 * Prints value of property "rootProject.name" to stdout.
 *
 * Usage: ./gradlew -q printRootProjectName
 */
task printRootProjectName {
    doLast {
        println(project.findProperty('rootProject').name)
    }
}