autocommands for writing and closing editor

[RishabhRD]

This PR is implementation of some features requested in #24 . Specifically it implements the following:

• While closing a single editor window (using :q or other quit commands), this closes the other one too. So, normal quit commands can be used to quit the window
• Now, the buffer supports saving testcases. The implementation doesn't bother if we are using msgpack-single-file feature or not. As, it just calls the callback provided to editor function with appropriate content. Here, if I save input, it saves output automatically and vice-versa.
• And thus :wq and other similar commands work seamlessly.

There is a similar feature that can be developed over similar lines and maybe pushed with same PR, that is to close other competitest runner window, when we close one of them (using :q)

The intent of the PR is to make competitest UI interaction work as close as possible to native vim keybindings, so that adding any testcase and other operations can be made as fast as using native vim keybindings.

We can discuss if these changes are aligned to project goals or not. And if there are any changes necessary for PR, we can do the same.

Thanks, Rishabh Dwivedi

[xeluxee]

Everything works fine but I've fixed your implementation to use functions that already exists

Before merging I'd like to get a similar behavior for runner UI (closing with :q), but it's less straightforward due to viewer popup. But I can't use autocommands for runner UI right now, see https://github.com/MunifTanjim/nui.nvim/issues/236 for details.

[xeluxee]

@RishabhRD please try out the latest commit, :q now works with runner UI too

[RishabhRD]

Hi @xeluxee , thanks for taking this PR forward. I didn't have time to do the required changes in these few days.

@RishabhRD please try out the latest commit, :q now works with runner UI too

Yeah, runner UI works great.

However, there is problem with editor UI now. It doesn't get closed when I close with :q.

Seems like this is something related to https://github.com/MunifTanjim/nui.nvim/issues/236

[RishabhRD]

I made the required changes for the PR to make editor UI work again.... We can discuss if there are any problems with defining autocmds before mounting.

[xeluxee]

However, there is problem with editor UI now. It doesn't get closed when I close with :q. Seems like this is something related to https://github.com/MunifTanjim/nui.nvim/issues/236

@RishabhRD please update nui.nvim to the latest commit

[RishabhRD]

@xeluxee I reverted the commit I made. It works fine with your changes. I guess we can now merge the feature and hope it would be helpful for others too.

And again thanks @xeluxee for taking the development of PR forward as it would have taken long time if I would have done the development bcz of lack of time.