Hooks for running something when cd-ing into or out of a directory

[Spakman]

I'm not entirely what the syntax for specifying this should be. Perhaps something like:

cd_on_entry do
  rake db:migrate
  rails server
end

[brandondrew]

how about this?

on_directory_entry do
  # do something...
end

[Spakman]

That's a lot nicer - cool!

Ideally, we'd just be able to enter this directly on the Urchin command line (once the parser becomes multi-line aware).