groovy - simple 'tree' command implementation

gistfile1.groovy

new File(".").eachDirRecurse { dir ->

    /* if you wonder why not to write ~/\\/ directly see    
       http://groovy.codehaus.org/Strings+and+GString#StringsandGString-SlashyStringliterals or 
       http://jira.codehaus.org/browse/GROOVY-2451 */

    def bs = "\\\\"
    def fs = "/"
    def pattern = ~/$bs|$fs/ 

    /* -------------------------------  */

    def numberOfDashes = dir.path.findAll(pattern).size()
    println " " * numberOfDashes + " - " + dir.name
}