Method: Rack::ShowExceptions#pretty

Defined in:
lib/rack/show_exceptions.rb

#pretty(env, exception) ⇒ Object 



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# File 'lib/rack/show_exceptions.rb', line 80

def pretty(env, exception)
  req = Rack::Request.new(env)

  # This double assignment is to prevent an "unused variable" warning.
  # 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.
  # Yes, it is dumb, but I don't like Ruby yelling at me.
  frames = frames = exception.backtrace.map { |line|
    frame = Frame.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