Poltergeist hack to silence CoreText performance notes from phantomjs

gistfile1.rb

module Capybara::Poltergeist
  class Client
    private
    def redirect_stdout(to)
      prev = STDOUT.dup
      prev.autoclose = false
      $stdout = to
      STDOUT.reopen(to)

      prev = STDERR.dup
      prev.autoclose = false
      $stderr = to
      STDERR.reopen(to)
      yield
    ensure
      STDOUT.reopen(prev)
      $stdout = STDOUT
      STDERR.reopen(prev)
      $stderr = STDERR
    end
  end
end

class WarningSuppressor
  class << self
    def write(message)
      if message =~ /QFont::setPixelSize: Pixel size <= 0/ || message =~/CoreText performance note:/ then 0 else puts(message);1;end
    end
  end
end

Capybara.register_driver :poltergeist do |app|
  Capybara::Poltergeist::Driver.new(app, phantomjs_logger: WarningSuppressor)
end

Capybara.javascript_driver = :poltergeist

I created a gem: https://github.com/uiureo/poltergeist-suppressor

You can write like this:

Capybara.register_driver :poltergeist do |app|
  Capybara::Poltergeist::Driver.new(app,
    phantomjs_logger: Capybara::Poltergeist::Suppressor.new
  )
end