module Roda::RodaPlugins::Base::RequestMethods

a URL mapper.
before dispatching to another rack app, so the app still works as
This updates SCRIPT_NAME/PATH_INFO based on the current remaining_path

response.status = 404 # not reached
r.run(proc{[404, {}, []]})
r.run(proc{[403, {}, []]}) unless r['letmein'] == '1'

the processing of the request:
from the rack app as the response for this request. This ends
Call the given rack app with the environment and return the response

def run(app)
  e = @env
  path = real_remaining_path
  sn = "SCRIPT_NAME"
  pi = "PATH_INFO"
  script_name = e[sn]
  path_info = e[pi]
  begin
    e[sn] += path_info.chomp(path)
    e[pi] = path
    throw :halt, app.call(e)
  ensure
    e[sn] = script_name
    e[pi] = path_info
  end
end