sync_files.rb

#!/usr/bin/env ruby

require "optparse"

def usage
  puts "usage: #{File.basename(__FILE__)} SRC DST [ -e EXCLUDE ] [ --use-sudo ]"
end

src = ARGV.shift
unless src
  usage 
  exit 1
end
src = File.join(src, "/")

dst = ARGV.shift
unless dst
  usage 
  exit 1
end
dst = File.join(dst, "/")

excludes = []
use_sudo = false
rsync_path = "rsync"

OptionParser.new.tap do |opt|
  opt.on("-e EXCLUDE") { |v| excludes << v }
  opt.on("--use-sudo") { |v| rsync_path = "sudo #{rsync_path}" }
  opt.parse!(ARGV)
end

exclude_options = excludes.map { |s| "--exclude #{s}" }.join(" ")

rsync_command = %Q(rsync -avz --no-o --no-g -e "ssh" --rsync-path=#{rsync_path} --delete #{exclude_options} #{src} #{dst})

monitor_command = case RUBY_PLATFORM
when /darwin/
  "fswatch -o #{src} | xargs -n1 -I{} #{rsync_command}"
when /linux/
  <<SCRIPT
while inotifywait -e modify -e create -e move -e delete --exclude "\..*\.sw[pox].*" -r #{src}; do
  #{rsync_command}
done
SCRIPT
end

`#{monitor_command}`