Create playlist-like structure on file system

.structure

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;Structure file for filelist.
;Each group is the path of the list, and each line after that is a link
;to include in that list
;
;This should be stored as .structure in the root directory
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

[path=/media/music/by-genre/rock/]
/Users/callumtaylor/Desktop/test/media/music/Autopilot Off

[path=/media/music/by-genre/metal/]
/media/music/Black Sabbath
/media/music/Autopilot Off

[path=/media/music/by-genre/all/]
/media/music/*

filelist

#! /bin/sh
# /etc/init.d/filelist
#

# Deals with running the file list generator
touch /var/lock/filelist

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting"
    sudo /usr/sbin/filelist.rb -f /mnt/filestore/media/music/ > /logs/music-filelist.log 2>&1 &
    sudo /usr/sbin/filelist.rb -f /mnt/filestore/media/movies/ > /logs/movies-filelist.log 2>&1 &
    sudo /usr/sbin/filelist.rb -f /mnt/filestore/media/tv-shows/ > /logs/tv-shows-filelist.log 2>&1 &
    sudo /usr/sbin/filelist.rb -f /mnt/filestore/media/photos/ > /logs/photos-filelist.log 2>&1 &
    ;;
  stop)
    echo "Stopping"
    sudo kill $(ps aux | grep '/usr/sbin/filelist.rb' | awk '{print $2}')
    ;;
  *)
    echo "Usage: /etc/init.d/filelist {start|stop}"
    exit 1
    ;;
esac

exit 0

filelist.rb

#!/usr/bin/ruby
require 'fileutils'

def main(base_path)
        File.open(base_path + "/.structure", "r") do |file|
                last_group = ""
                while (line = file.gets)
                        if (line[/^\;/] != nil or line.strip.length < 1)
                                next
                        end

                        if (line[/\[.*\]/] != nil)
                                path = line.gsub(/\n/, "").strip;
                                path = path[1 .. path.length - 2]
                                paths = path.split("=")
                                last_group = paths[1].strip
                                reset_path(last_group)
                                next
                        else
                                path = line.strip.split("\t")
                                handle_path(last_group, path[0], path[1] || [])
                        end
                end
        end
end

def reset_path(path)
        FileUtils.rm_rf path
        FileUtils.mkdir_p path
end

def handle_path(path, link. regex)
        cmd = "python /usr/sbin/rln.py -s \"#{link}\" \"#{path}\" #{regex}"
        puts cmd
        system(cmd)
end

def watch(path)
        changed = false

        if (File.exist?(path + "/.structure"))
                lasttime = File.mtime(path + "/.structure")
                while (!changed)
                        sleep(1)
                        changed = lasttime != File.mtime(path + "/.structure")
                end

                main(path)
                watch(path)
        end
end

if (ARGV.length < 1)
        puts "Creates a playlist like folder structure"
        puts "Usage: filelist [-f] <path to .structure>"
        puts "Options: "
        puts "  -f      Force rebuild"
	puts ""
	puts "Example .structure file"
	puts ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
	puts ";Structure file for filelist."
	puts ";Each group is the path of the list, and each line after that is a link"
	puts ";to include in that list"
	puts ";"
	puts ";This should be stored as .structure in the root directory"
	puts ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
	puts "[path=/media/music/by-genre/rock/]"
	puts "/Users/callumtaylor/Desktop/test/media/music/Autopilot Off"
	puts "[path=/media/music/by-genre/metal/]"
	puts "/media/music/Black Sabbath"
	puts "/media/music/Autopilot Off"
else
	if (ARGV[0] == "-f")
		main(ARGV[1])
		ARGV[0] = ARGV[1]
	end
	watch(ARGV[0])
end