如何从递归Groovy闭包中获得返回值？

Question

i seem to have written a recursive closure :) difficult enough but i am not struggling on how to get feedback from this closure. My written closure deletes a file recursively from the a starting point on the filesystem. I want to now how many files have been deleted!

How can is get feedback on how many files i have deleted? I tried with delegate etc but no luck so far..

  def deleteClosure deleteClosure = { it.eachDir( deleteClosure ) it.eachFileMatch( ~".*123.jpg" ) { it.delete() } } 

    deleteClosure(new File("/tmp/delete.me"))

Answer 1

There is no need to write your own recursive closure code, Groovy adds an eachFileRecurse method to File objects. To get a count of files deleted you can always just increment a counter:

import groovy.io.*

def filesDeletedCount = 0
new File('/tmp/delete.me').eachFileRecurse(FileType.FILES) {
    if (it.name ==~ /.*123.jpg$/) {
        it.delete()
        filesDeletedCount++
    }
}

println "Files deleted: ${filesDeletedCount}"