How to run gradle tasks in sequence in a easy way

build.gradle

Task.metaClass.runFirst = { Task... others ->
    delegate.dependsOn(others)
    delegate.mustRunAfter(others[0])
    for (def i=0; i < others.size() - 1; i++) {
        def before = others[i]
        def after = others[i+1]
        after.mustRunAfter(before)
    }
}

task x {
    doFirst{
        println "X"
    }
}
task a {
    doFirst{
        println "A"
    }
}
task b {
    doFirst{
        println "B"
    }
}
task c {
    doFirst{
        println "C"
    }
}

x.runFirst a,b,c