`nix run -f` does not accept subcommand arguments

[roberth]

Describe the bug

# setup, specifics don't matter
$ echo 'derivation { name = "hi"; system = "foo"; }' >open-docs.nix

$ nix run -f open-docs.nix -- subpath.html
error: attribute 'subpath' in selection path 'subpath.html' not found

It's treating the argument as an attribute path. YIKES

Steps To Reproduce

Yes ^

Expected behavior

At the very least, treat arguments as exec arguments.

$ nix run -f open-docs.nix -- subpath.html
opening /nix/store/.../subpath.html

Probably the -- should have significant meaning in this case (besides allowing -foo syntax)

$ nix run -f open-docs.nix greeter -- --subject traveler  # note the attribute, greeter
hello, traveler

Metadata

Additional context

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

---

Add 👍 to issues you find important.