gistfile1.rb

# robocopy.rb

class Robocopy

    attr_accessor :source, :target, :excludeDirs, :includeFiles, :logPath
    
    def run()
        robocopy = "robocopy.exe " \
                   "\"#{@source}\" " \
                   "\"#{@target}\" " \
                   "/MIR " \
                   "/XD #{@excludeDirs} " \
                   "/IF #{@includeFiles} " \
                   "/LOG+:\"#{@logPath}\" " \
                   "/TEE"
            
        errorHandler = \
            lambda do |ok, res|
                       raise "Robocopy failed with exit " \
                             "code #{res.exitstatus}." \
                       if res.exitstatus > 8
                   end

        sh robocopy, &errorHandler 
    end
    
end

def robocopy(*args, &block)
    body = lambda { |*args|
        rc = Robocopy.new
        block.call(rc)
        rc.run
    }
    Rake::Task.define_task(*args, &body)
end
    
# rakefile.rb

desc "Deploys the application."
robocopy :deploy => :build do |rc|
    rc.source = "src/ProjectEuler.UI"
    rc.target = "D:/Websites/euler.mikeobrien.net/wwwroot"
    rc.excludeDirs = "obj"
    rc.includeFiles = "*.dll *.pdb *.config *.asax *.ascx *.ashx " \
                      "*.aspx *.master *.htm *.html *.txt *.css " \
                      "*.gif *.jpg *.jpeg *.png *.xml *.js"
    rc.logPath = "Robocopy.log"
end

Nice catch, thx for pointing that out.