Add statusline option: filename-display-mode

[theteachr]

Allows for showing only the filename instead of the path which can sometimes be long.

[Ordoviz]

I'm not a maintainer, but this should probably be called file-basename.

[the-mikedavis]

Instead of an option to control the element I think this should be a new statusline element

[theteachr]

Instead of an option to control the element I think this should be a new statusline element

Could we make the FileName (might as well rename to FileBaseName?) element be just the name of the file and add another element for the parent directory of the open file?

[the-mikedavis]

I don't think we need to modify the current elements. Statusline elements usually have spacing around them that would make it look odd to have a separate element for the basename and the parent directory/directories

[theteachr]

I tested with adding a new element which just renders the file base name. I have the following snippet in my Helix Config now.

[editor.statusline]
left = ["mode", "spinner", "file-base-name"]

But I'm concerned that this can lead to a configuration with both file-name and file-base-name that would be redundant.

Anyway, I can close this one and raise another PR where I have added a new StatusLineElement instead of introducing an option.

[the-mikedavis]

I don't think that's a bad thing - it should be possible to have both file-name and file-base-name

[theteachr]

Closing this in favor of #5318.