This microlibrary implements employee directory diffing between two versions. It generates a list of operations that need to be performed to transform the directory in version 1 to version 2.

Add this line to your application's Gemfile:

gem 'directory_diff'

And then execute:

$ bundle

Or install it yourself as:

$ gem install directory_diff

# Extract out current directory from the database into memory
# into a format that's similar to the incoming CSV, i.e.
# full name, email, phone number, assistant email
existing_directory = [
  ["Kamal Mahyuddin", "[email protected]", "415-555-1234", "[email protected]"],
  ["Adolfo Builes", "[email protected]", "415-666-9999", nil]
]

csv_data = [
  ["Kamal Mahyuddin", "[email protected]", "415-555-1234", "[email protected]"],
  ["Adolfo Builes-Ramirez", "[email protected]", "415-666-9999", "[email protected]"],
  ["Matthew Johnston", "[email protected]", "415-777-8888", nil]
]

operations = DirectoryDiff.transform(existing_directory).into(csv_data)
# => [
#      [:insert, "Matthew Johnston", "[email protected]", "415-777-8888", nil],
#      [:update, "Adolfo Builes-Ramirez", "[email protected]", "415-666-9999", "[email protected]"],
#      [:noop, "Kamal Mahyuddin", "[email protected]", "415-555-1234", "[email protected]"]
#    ]

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/envoy/directory_diff. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.