OldeCodeFinder finds old code. This means files which are largely older than a specific date.

It can also find files which were mostly written by a particular person. So if Fred left the company 3 years ago, files which consist mostly of lines which were written by him may be worth revisiting.


Add this line to your application's Gemfile in the 'development' group:

gem 'olde_code_finder'

And add this to your Rakefile:

begin; require 'olde_code_finder/tasks'; rescue LoadError; end

And then execute:

$ bundle

Or install it yourself as:

$ gem install olde_code_finder


See if more than 80% of app/models/foo.rb was written by Benjamin Franklin:

bundle exec rake olde_code_finder:find_by_author['app/models/foo.rb','Benjamin Franklin','80']

Or you can use a glob:

bundle exec rake olde_code_finder:find_by_author['app/models/*.rb','Benjamin Franklin','80']

Or you can specify a lower percentage threshold:

bundle exec rake olde_code_finder:find_by_author['app/models/*.rb','Benjamin Franklin','60']

The author name is a regex, so this will find 'Benjamin Franklin' as well as 'Ben Franklin':

bundle exec rake olde_code_finder:find_by_author['app/models/*.rb','Frank','80']

Or you can run a different task and find code older than a certain date instead:

bundle exec rake olde_code_finder:find_by_date['app/models/*.rb','4 years','80']

The output will be a list of files that meet the criteria:

foo> $ bundle exec rake olde_code_finder:find_by_author['app/models/*.rb','Benjamin Franklin','80']
More than 80% of app/models/foobar.rb was written by Benjamin Franklin (85%)

How does it work?

It uses git blame to see who last touched each line of a file and when.


  1. Fork it ( http://github.com//olde_code_finder/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request


  • Tom Copeland: Author
  • Joe Rafaniello: Added percentage display