File globbing should support pattern checks

[victorhurdugaci]

Today you cannot check if if a path matches a pattern without executing the globbing pattern (aka going to disk). This slows down dotnet watch a lot because on every file change it has to go to the disk, fetch all files and the see if the changed file is in the resulting list.

[pranavkm]

Isn't this what FileSystemGlobber does - https://github.com/aspnet/FileSystem/blob/dev/src/Microsoft.Extensions.FileProviders.Physical/PhysicalFilesWatcher.cs#L107-L108

[victorhurdugaci]

Nope. What I want to do is, given:

1. Base path: /foo
2. Pattern: **/*.js

Tell me if /foo/baz/bar.js matches that without going to the disk.

[dazinator]

Tell me if /foo/baz/bar.js matches that without going to the disk.

Yes please! Does globbing only work with PhysicalFileProvider currently then?

I'd like to take:

1. A pattern **/*.js
2. An IEnumerable<string> paths - {"some/path/file1.js", "some/path/file2.js", "someother/file/one.txt"}

Tell me what the matches are (without going to disk)

This way, I can easily use globbing within my own IFileProviders too.

[BrennanConroy]

767f07f