how to capture the content in form blocks?

#!/usr/bin/env ruby -wKU

def form(name, attrs={},&block)
  content = block.call if block_given?
  "<form #{attrs.inspect}>#{content}</form>"
end

def textfield(name, attrs={})
  out = "<input type=\"text\" name=\"#{name}\"#{attrs.inspect}>"
end

def msg(msg)
  msg
end

f = form('user',:id => "id", :action => "/users") do 
  textfield(:name, :label => "Name", :value => "This works?") 
  msg("this is the content")
end

p f



# p callcc {|cont| cont.call } # nil 
# p callcc {|cont| cont.call 1 } # 1 
# p callcc {|cont| cont.call 1, 2, 3 } # => [1, 2, 3]



def block_catcher(&block)
  block.call
end

block_catcher do
  puts 'hello there'
  puts 'Hi again'
end