<% begin %>
<% # redefine print, puts & p
OUTPUT = StringIO.new
def print *args
OUTPUT.print *args
end
def puts *args
OUTPUT.puts *args
end
def p *args
OUTPUT.puts *args.map(&:inspect)
end
%>
<% begin %>
<% binding = Object.new.send :binding %>
<% binding.eval(script, "(script)", 1) %>
<% OUTPUT.string.each_line do |line| %>
<%= h line %>
<% end %>
<% rescue => error %>
<%= h error.class %>: <%= h error.message %>
<% error.backtrace.each do |backtrace| %>
<% next unless backtrace.start_with? "(script)" %>
<%= h backtrace %>
<% end %>
<% end %>
<% rescue => error %>
<%= erb :error, locals: { error: error }, layout: false %>
<% end %>