## Contributing

I value any contribution to mime-types you can provide: a bug report, a feature
request, or code contributions.

There are a few guidelines for contributing to mime-types:

* Code changes *will* *not* be accepted without tests. The test suite is
  written with [minitest][].
* Match my coding style.
* Use a thoughtfully-named topic branch that contains your change. Rebase your
  commits into logical chunks as necessary.
* Use [quality commit messages][].
* Do not change the version number; when your patch is accepted and a release
  is made, the version will be updated at that point.
* Submit a GitHub pull request with your changes.
* New or changed behaviours require new or updated documentation.

### Adding or Modifying MIME Types

The mime-types registry is no longer contained in mime-types, but in
[mime-types-data][]. Please see that project for contributions there.

### Test Dependencies

mime-types uses Ryan Davis’s [Hoe][] to manage the release process, and it adds
a number of rake tasks. You will mostly be interested in:

    $ rake

which runs the tests the same way that:

    $ rake test
    $ rake travis

will do.

To assist with the installation of the development dependencies for mime-types,
I have provided the simplest possible Gemfile pointing to the (generated)
`mime-types.gemspec` file. This will permit you to do:

    $ bundle install

to get the development dependencies. If you aleady have +hoe+ installed, you
can accomplish the same thing with:

    $ rake newb

This task will install any missing dependencies, run the tests/specs, and
generate the RDoc.

You can run tests with code coverage analysis by running:

    $ rake test:coverage

### Benchmarks

mime-types offers several benchmark tasks to measure different measures of
performance.

There is a repeated load test, measuring how long it takes to start and load
mime-types with its full registry. By default, it runs fifty loops and uses the
built-in benchmark library.

    $ rake benchmark:load

There are two allocation tracing benchmarks (for normal and columnar loads).
These can only be run on Ruby 2.1 or better and requires the
[allocation\_tracer][] gem (not installed by default).

    $ rake benchmark:allocations
    $ rake benchmark:allocations:columnar

There are two loaded object count benchmarks (for normal and columnar loads).
These use `ObjectSpace.count_objects`.

    $ rake benchmark:objects
    $ rake benchmark:objects:columnar

### Workflow

Here's the most direct way to get your work merged into the project:

* Fork the project.
* Clone down your fork (`git clone git://github.com/<username>/ruby-mime-types.git`).
* Create a topic branch to contain your change (`git checkout -b my_awesome_feature`).
* Hack away, add tests. Not necessarily in that order.
* Make sure everything still passes by running `rake`.
* If necessary, rebase your commits into logical chunks, without errors.
* Push the branch up (`git push origin my_awesome_feature`).
* Create a pull request against mime-types/ruby-mime-types and describe what
  your change does and the why you think it should be merged.

### Contributors

*   Austin Ziegler created mime-types.

Thanks to everyone else who has contributed to mime-types over the years:

*   Aaron Patterson
*   Aggelos Avgerinos
*   Andre Pankratz
*   Andy Brody
*   Arnaud Meuret
*   Brandon Galbraith
*   Burke Libbey
*   Chris Gat
*   David Genord
*   Dillon Welch
*   Eric Marden
*   Edward Betts
*   Garret Alfert
*   Godfrey Chan
*   Greg Brockman
*   Hans de Graaff
*   Henrik Hodne
*   Janko Marohnić
*   Jeremy Evans
*   Juanito Fatas
*   Jun Aruga
*   Łukasz Śliwa
*   Keerthi Siva
*   Ken Ip
*   Martin d'Allens
*   Mauricio Linhares
*   Nicolas Leger
*   nycvotes-dev
*   Postmodern
*   Richard Hirner
*   Richard Hurt
*   Richard Schneeman
*   Tibor Szolár
*   Todd Carrico

[minitest]: https://github.com/seattlerb/minitest
[quality commit messages]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
[mime-types-data]: https://github.com/mime-types/mime-types-data
[Hoe]: https://github.com/seattlerb/hoe
[allocation\_tracer]: https://github.com/ko1/allocation_tracer