Find m4a files, and make them m4r files.

ringtonize.rb

#!/usr/bin/env ruby

require 'FileUtils'

def main
  config = parse_args
  files = find_m4a(config[:src])
  mangled = mangle_names(files, config[:dst])
  move_files(mangled)
end

def move_files(mangled)
  mangled.each do |src, dst|
    begin
      FileUtils.mv(src, dst)
    rescue Exception => e
      log("ERROR: Problem moving #{src} to #{dst}", true)
      log("ERROR: #{e.message}", true)
      exit(101)
    end
    log("✓ #{dst}")
  end
end

def mangle_names(files, dst)
  ret = {}
  files.each do |file|
    ret[file] = dst + '/' + file.split('/')[-1].gsub(/m4a$/, 'm4r')
  end
  ret
end

def find_m4a(src)
  `find #{src} -name \*m4a -print0`.split("\0")
end

def parse_args
  if ARGV.length != 2 then
    log "ERROR: Invalid number of arguments.", true
    usage
    exit(42)
  end
  config = { :src => ARGV[0], :dst => ARGV[1] }
  # Ensure source and dest dirs both exist
  if not File.directory?(config[:src]) then
    log "ERROR: source directory doesn't exist: #{config[:src]}"
    usage
    exit(43)
  end
  if not File.directory?(config[:dst]) then
    Dir.mkdir(config[:dst])
  end
  return config
end

def log(msg, error=false)
  if error then
    STDERR.puts(msg)
    return
  end
  puts msg
end

def usage
  log ""
  log "# Usage"
  log "  #{__FILE__} path/to/m4a/files path/to/destination/directory"
  log "# Example"
  log "  #{__FILE__} . ."
  log "  #{__FILE__} /home/user/music /home/user/ringtones"
  log "# Description"
  log "  Recurses through given directory looking for m4a files to turn into"
  log "  m4r (Apple ringtone) files."
end
main