docker-clean

#!/usr/bin/env groovy                                                                                                                                                                                                                      
                                                                                                                                                                                                                                           
images = 'docker images -a'.execute().text                                                                                                                                                                                                 
                                                                                                                                                                                                                                           
images.tokenize('\n').eachWithIndex { line, it ->                                                                                                                                                                                          
    if (it == 0) {                                                                                                                                                                                                                         
        // first line is table header                                                                                                                                                                                                      
        return                                                                                                                                                                                                                             
    }                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                           
    def parts = line.tokenize(" ").collect { it.trim() }                                                                                                                                                                                   
    def (rep, tag, id) = parts                                                                                                                                                                                                             
                                                                                                                                                                                                                                           
    if (rep != '<none>') {                                                                                                                                                                                                                 
        def reply = System.console().readLine "remove ${id} - ${rep}:${tag}?[y to remove]: "                                                                                                                                               
        if (reply != 'y') {                                                                                                                                                                                                                
            return                                                                                                                                                                                                                         
        }
    }

    def out = "docker rmi -f ${id}".execute().text
    if (out?.trim()) {
        print out
        println ""
    }
}