FR: Auto-updating versions of Basefunctions: @readdir, @isfile, @read, @pwd, @stat, etc.

[fonsp]

We could use PlutoHooks and file watching to create auto-updating versions of lots of filesystem functions from Base! https://docs.julialang.org/en/v1/base/file/#Base.Filesystem.readdir

For example: readdir(path) gives all files in a dir. @readdir(path) would return the same, but automatically re-run if something changed! This would be a super simple API for file watching!

For example, a dropdown menu of all files in a directory that automatically updates the list of options:

@bind filename Select(@readdir("exports"))

[fonsp]

Besides filesystem functions, there might be more functions from Base that we could make "auto-watching". e.g. @download could poll the headers of a URL resource (like Etag or Created) and re-download when something changed. @length(xs) could re-run when you call push!(xs,123)...