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:

Adding or Modifying MIME Types ↑

The mime-types registry is loaded from encoded files in data. These are not editable and cannot be compared meaningfully in a pull request; pull requests that include changes to these files will require amendment to revert these files.

New or modified MIME types should be edited in the appropriate YAML file under type-lists. The format is as shown below for the application/xml MIME type in type-lists/application.yml.

- !ruby/object:MIME::Type
  content-type: application/xml
  encoding: 8bit
  extensions:
  - xml
  - xsl
  references:
  - IANA
  - RFC3023
  xrefs: !ruby/hash:MIME::Types::Container
    rfc:
    - rfc3023
  registered: true

There are other fields that can be added, matching the fields discussed in the documentation for MIME::Type. Pull requests for MIME types should just contain the changes to the YAML files for the new or modified MIME types; I will convert the YAML files to JSON prior to a new release. I would rather not have to verify that the JSON matches the YAML changes, which is why it is not necessary to convert for the pull request.

If you are making a change for a private fork, use rake convert:yaml:json to convert the YAML to JSON, or rake convert:yaml:columnar to convert it to the new columnar format.

Updating Types from the IANA or Apache Lists ↑

If you are maintaining a private fork and wish to update your copy of the MIME types registry used by this gem, you can do this with the rake tasks:

$ rake mime:iana
$ rake mime:apache

Both of these require Nokogiri, which is not installed by default. Install it in the usual way for your Ruby.

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:

Contributors ↑

Thanks to everyone else who has contributed to mime-types: