id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
371514413,MDExOlB1bGxSZXF1ZXN0MjIzOTQzNTcz,2492,ENH: Detect the GRIB files by the filename extension and suggest engine.,226037,closed,0,,,11,2018-10-18T12:50:13Z,2018-10-25T20:57:38Z,2018-10-22T15:26:14Z,MEMBER,,0,pydata/xarray/pulls/2492,"`_get_default_engine` chooses the engine suitable to open the `path`, ATM it only detects URL's. In this PR I propose to also detect GRIB files by the extension and suggest to the user which `engine` to use.

**Updated:** The whole engine detection strategy looked a bit fragile as the `.gz` extension was recognised outside of `_get_default_engine` and the nested `if`s and `try` / `except` blocks make the code poorly readable. I added a bit of a refactor in this area.

 - ~~Closes xxxx~~
 - [x] Tests added
 - ~~Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API.~~ No change to document.
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/2492/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull