Function attachments 

pub fn attachments(
    text: &str,
    base: &Path,
    workspace: &dyn Workspace,
) -> Attached

The files text names with @path, each once, resolved from base in workspace and read from it. Every @ token that names a file there is attached, whatever its shape (@notes.md, @src/lib.rs, @Makefile, @.env); one with no file there is missing when it looks like a path, and otherwise stays text, such as @alice or @alice.smith. A token’s trailing punctuation is not part of its path. A leading ~/ is the user’s home on this machine; in another workspace it is not attached, with a note.

Reads workspace: on a thread that must not wait, call it only for a local one (Workspace::host is None).