mattetti

module Excel
  module Formulas  
    def pmt(rate, nper, pv, fv=0, type=0)
      ((-pv * pvif(rate, nper) - fv ) / ((1.0 + rate * type) * fvifa(rate, nper)))
    end

    def ipmt(rate, per, nper, pv, fv=0, type=0)
      p = pmt(rate, nper, pv, fv, 0);
      ip = -(pv * pow1p(rate, per - 1) * rate + p * pow1pm1(rate, per - 1))
      (type == 0) ? ip : ip / (1 + rate)

jerodsanto

module Rack
  class FirebugLogger
    def initialize(app, options = {})
      @app     = app
      @options = options
    end

    def call(env)
      status, headers, orig_response = @app.call(env)
      return [status, headers, orig_response] unless (headers["Content-Type"] =~ /html/ && env['firebug.logs'])