class Sinatra::ShowExceptions

information helpful to attackers.
Be careful when you use this on public-facing sites as it could reveal
context, the whole Rack environment and the request data.
wraps. It shows a useful backtrace with the sourcefile and clickable
Sinatra::ShowExceptions catches all exceptions raised from the app it

def bad_request?(e) 

def bad_request?(e)
  Sinatra::BadRequest === e
end

def call(env) 

def call(env)
  @app.call(env)
rescue Exception => e
  errors, env["rack.errors"] = env["rack.errors"], @@eats_errors
  if prefers_plain_text?(env)
    content_type = "text/plain"
    body = dump_exception(e)
  else
    content_type = "text/html"
    body = pretty(env, e)
  end
  env["rack.errors"] = errors
  [
    500,
    {
      "Content-Type" => content_type,
      "Content-Length" => body.bytesize.to_s
    },
    [body]
  ]
end

def frame_class(frame) 

def frame_class(frame)
  if frame.filename =~ %r{lib/sinatra.*\.rb}
    "framework"
  elsif (defined?(Gem) && frame.filename.include?(Gem.dir)) ||
        frame.filename =~ %r{/bin/(\w+)\z}
    "system"
  else
    "app"
  end
end

def initialize(app) 

def initialize(app)
  @app = app
end

def prefers_plain_text?(env) 

def prefers_plain_text?(env)
  !(Request.new(env).preferred_type("text/plain","text/html") == "text/html") &&
  [/curl/].index { |item| item =~ env["HTTP_USER_AGENT"] }
end

def pretty(env, exception)

in the future.
If Rack provides another way to override, this could be removed
Pulled from Rack::ShowExceptions in order to override TEMPLATE. 
def pretty(env, exception)
  req = Rack::Request.new(env)
  # This double assignment is to prevent an "unused variable" warning on
  # Ruby 1.9.3.  Yes, it is dumb, but I don't like Ruby yelling at me.
  path = path = (req.script_name + req.path_info).squeeze("/")
  # This double assignment is to prevent an "unused variable" warning on
  # Ruby 1.9.3.  Yes, it is dumb, but I don't like Ruby yelling at me.
  frames = frames = exception.backtrace.map { |line|
    frame = OpenStruct.new
    if line =~ /(.*?):(\d+)(:in `(.*)')?/
      frame.filename = $1
      frame.lineno = $2.to_i
      frame.function = $4
      begin
        lineno = frame.lineno-1
        lines = ::File.readlines(frame.filename)
        frame.pre_context_lineno = [lineno-CONTEXT, 0].max
        frame.pre_context = lines[frame.pre_context_lineno...lineno]
        frame.context_line = lines[lineno].chomp
        frame.post_context_lineno = [lineno+CONTEXT, lines.size].min
        frame.post_context = lines[lineno+1..frame.post_context_lineno]
      rescue
      end
      frame
    else
      nil
    end
  }.compact
  TEMPLATE.result(binding)
end