Groovy Goodness: Traversing a Directory

Groovy adds the traverse() method to the File class in version 1.7.2. We can use this method to traverse a directory tree and invoke a closure to process the files and directories. If we look at the documentation we see we can also pass a map with a lot of possible options to influence the processing.

view sourceprint?
00.import static groovy.io.FileType.*
01.import static groovy.io.FileVisitResult.*
02. 
03.def groovySrcDir = new File(System.env['GROOVY_HOME'], 'src/')
04. 
05.def countFilesAndDirs = 0
06.groovySrcDir.traverse {
07.countFilesAndDirs++
08.}
09.println "Total files and directories in ${groovySrcDir.name}: $countFilesAndDirs"
10. 
11.def totalFileSize = 0
12.def groovyFileCount = 0
13.def sumFileSize = {
14.totalFileSize += it.size()
15.groovyFileCount++
16.}
17.def filterGroovyFiles = ~/.*\.groovy$/
18.groovySrcDir.traverse type: FILES, visit: sumFileSize, nameFilter: filterGroovyFiles
19.println "Total file size for $groovyFileCount Groovy source files is: $totalFileSize"
20. 
21.def countSmallFiles = 0
22.def postDirVisitor = {
23.if (countSmallFiles > 0) {
24.println "Found $countSmallFiles files with small filenames in ${it.name}"
25.}
26.countSmallFiles = 0
27.}
28.groovySrcDir.traverse(type: FILES, postDir: postDirVisitor, nameFilter: ~/.*\.groovy$/) {
29.if (it.name.size() < 15) {
30.countSmallFiles++
31.}