Hydra: [Feature Request] Support .yml in addition to .yaml for config composition

[tamuhey]

🚀 Feature Request

Motivation

Is your feature request related to a problem? Please describe.

The directory structure of my app looks like:

├── db
│   ├── mysql.yml
│   └── postgresql.yml
├── config.yml
└── my_app.py

and the config.yml is:

defaults:
    - db: mysql

Running app.py raises the error:

hydra.errors.MissingConfigException: Could not load db/mysql.yaml

Hydra seems to support .yaml but not .yml.

[omry]

Hi @tamuhey, is there a specific case for this? I am not sure supporting .yml files justifies checking for the existence of a file with the second extension if the first one fails.
it also opens up to weird cases where you have both yaml and yml files.

[tamuhey]

It's a matter of preference.
Because .yml is widely used (e.g. github actions auto generated file), users sometimes have .yml and .yaml in same repository if they use hydra.

[omry]

I am going to park this one.
I will reconsider if it gets a significant number of votes, for now there does not seem to be a solid enough case here.

The magical support for .yaml is making things more complicated they I would like them to be. I don't want to make things even worse by adding support for .yml files.

[omry]

This does not seem to justify the extra complexity, closing.