如何将Rails控制台（IRB）中的所有方法包装在Ruby中的块中？

Question

I have seen http://ruby-doc.org/stdlib-2.0.0/libdoc/irb/rdoc/IRB.html and can see various ways to customize IRB. But did not see how to:

Write a block (or method) such that whenever a command is run in Rails console it runs the block.

For example:

begin
  puts :before
  yield
  puts :after
end

Then, when you do

=> puts :OK
:before
:OK
:after

Answer 1

If you're able to switch from IRB to Pry (the pry-rails gem will load it automatically for rails c ), it provides a hooks API that should do what you need. It sounds like you'd want the :before_eval and :after_eval events.

I don't know of an equivalent mechanism for IRB, though it should be possible to hack something using TracePoint.