Replace `@file` and `@directory` with `@files` with globbing support

[GordianDziwis]

This would simplify things:

@directory:/home/wiki -> @files:/home/wiki
@file:/home/wiki/index.md -> @files:/home/wiki/index.md

And this would make this command more versatile:

@files:/home/wiki/*.md

[frankroeder]

Hi @GordianDziwis, thanks for filing an issue. I am very open to improving the overall process and making it as intuitive as possible. The completion feature definitely needs some more polishing.
To your suggestion, I am not too sure about the globbing and renaming it as @files, although it only refers to the case with the globbing only. Let me think about it and collect more feedback for this.

[GordianDziwis]

I would care more about the globbing than the renaming...

An alternative to globbing could a Picker, like codecompanion.nvim does it.

Another alternative could be to get files as completion candidates, like it happen with @buffer.

[frankroeder]

Alright, I see an option for implementing the globbing. Files should already be completion candidates when typing @files:. Are you running into issues with that?
I see your point with a picker; it would be way easier to select multiple files.

[GordianDziwis]

The issue was me, I always wrote files:/ or files:./ and so I did not trigger parrots completion but cmp's path completion.

[frankroeder]

Resolved with #134

[GordianDziwis]

It does not work for me, because expand already handles globs, they are just called wildcards:

expand({string} [, {nosuf} [, {list}]])                               *expand()*
		Expand wildcards and the following special keywords in
		{string}.  'wildignorecase' applies.

So depending on Neovim's settings, this line can return a list of directories, which breaks the current logic.

[frankroeder]

Alright, I see the issue with the previous expand, you are totally right. Please provide examples for your failure cases. Are you talking about patterns like foo/*/*.lua and foo/*/*.lua? Because for the very simple case foo/*.lua it definitely should work.
The correct way might be to only use glob to immediately get the list of filepaths.

[GordianDziwis]

It works, I did not pull your last commit into my fork. Thanks!

[devth]

I would love to see a Telescope file picker like CodeCompanion's /file command.

I haven't been able to get @buffer or @file working. Is it intended to work in a :PrtChatNew buffer? I must be doing something wrong. Here's an example where I tried prompting with:

@buffer:Chat.ts what does the Chat model do?

and the response looks like it didn't read in my actual buffer contents.

[GordianDziwis]

@file needs to be in its own line:

@buffer:Chat.ts 

what does the Chat model do?