path: make some @std/path functions work with file URL object

[kt3k]

As FS APIs in Deno works with file URL object, it would make sense to support file URL input with path.dirname.

dirname(new URL("file:///path/to/dir/file")) // returns `/path/to/dir` on unix
dirname(new URL("file:///C:/path/to/dir/file")) // returns `C:\path\to\dir` on windows

This probably would throw with non-file URLs.

I think this mostly addresses the motivation we added std/url.

• dirname()
• extname()
• join()
• basename
• normalize

[iuioiua]

Just dirname() or the other functions too?

[kt3k]

I think this also makes sense for other functions such as basename, extname, common, join, relative, and resolve

[kt3k]

I don't think we need to limit this to std/path/posix as file URL object is platform independent

[iuioiua]

I think @std/path in its current state is good enough. Though, it's not a strong opinion of mine. @kt3k, do you still strongly believe we should have these additions? If yes, are you able to add them so we can progress with #5630?

[kt3k]

I'd suggest we would target basename and normalize instead of resolve and relative for the remaining items as they are something exposed as std/url APIs.

We can revisit resolve and relative as they are requested

[iuioiua]

SGTM

[kt3k]

done