Renaming a Rails 3 app

Annoyingly Rails 3 spreads whatever name you give it when running ‘rails new’ over 10 or so files. This makes it hard to setup a base app. The following shell commands will change the name of the app to the new name:

find . -type f -print0 | xargs -0 perl -pi -e 's/Oldapp/Newapp/g' find . -type f -print0 | xargs -0 perl -pi -e 's/oldapp/newapp/g'
I'm a little ashamed that the snippet uses perl instead of ruby. When I was trying to get the equivalent to work in ruby 1.9 it keep complaining about encoding. For anyone that is interested the ruby version I was attempting to use was:
find . -type f -print0 | xargs -0 ruby -pi -e '$_.gsub(/Oldapp/, "Newapp")'
Which gets an error:
-e:1:in `gsub': invalid byte sequence in UTF-8 (ArgumentError) from -e:1:in `<main>'
Even trying to force an encoding didn't seem to solve the problem.
find . -type f -print0 | xargs -0 ruby -pi -e '$_.force_encoding("UTF-8").gsub(/Oldapp/, "Newapp")'
It is likely this wouldn't occur if used from Ruby 1.8

Update:

While it’s nice to have a one liner that will accomplish the renaming. I’ve seen the above one liner corrupt the .git/index

I’ve written a simple ruby script that is more limited in how it selects the files: