如何减少堆栈跟踪中的输出？

Question

当出现错误时,有没有办法减少Ruby提供的输出量？

例如:

rspec bowling_spec.rb 
/Users/snowcrash/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- bowling (LoadError)
  from /Users/snowcrash/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
  from /Users/snowcrash/Developer/Code/Ruby/RSpec/bowling_spec.rb:2:in `<top (required)>'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/configuration.rb:896:in `load'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/configuration.rb:896:in `block in load_spec_files'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/configuration.rb:896:in `each'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/configuration.rb:896:in `load_spec_files'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/command_line.rb:22:in `run'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/runner.rb:80:in `run'
  from /Users/snowcrash/.rvm/gems/ruby-2.0.0-p195/gems/rspec-core-2.14.2/lib/rspec/core/runner.rb:17:in `block in autorun'

我感兴趣的只是第一行cannot load such file -- bowling (LoadError).理想情况下,我希望Ruby不要吐出其余的部分from.

这可能吗？

Answer 1

做这样的事情：

module Kernel
  at_exit do
    case $!
    when nil, SystemExit, Interrupt
    else puts $!.message, $@.first
    end
    $stderr.reopen(IO::NULL)
    $stdout.reopen(IO::NULL)
  end
end