feat(extra): add flag 'current_dir' to `oldfiles()` picker

[abeldekat]

• [x] I have read CONTRIBUTING.md
• [x] I have read CODE_OF_CONDUCT.md

Reference: This discussion

In my workflow, each project is opened in a tmux session. As such, when querying oldfiles, I am mostly interested in files inside the current working directory.

MiniExtra.pickers.oldfiles() currently does not filter on cwd

This PR adds flag "current_dir" to MiniExtra.pickers.oldfiles()

[abeldekat]

Remarks:

The name current_dir: Only the value of variable current_dir indicates that this is a boolean.

System call vim.loop.os_uname() is always executed, also when current_dir is not supplied. Would this approach be appropriate?

[echasnovski]

Thanks for the PR!

I appreciate the exact copy of the approach from 'mini.starter' (I'd usually do that too), however I think the better approach here is to use plain vim.startswith() with cwd .. '/'. As far as I remember, built-in paths coming from Neovim always use forward slash. If not, we'll wait for a Windows user to report.

I've merged in the temporary branch to polish up a bit.

[echasnovski]

Thanks again for following through!

This should now be part of latest main.

[abeldekat]

Thank you!