- For the command `brew install --cask racket`, a user was reporting the
behaviour where despite `--cask` in the command, they were getting
output about the `racket` formula having been renamed:
```
$ brew install --cask racket
Warning: Use minimal-racket instead of deprecated racket
==> Downloading https://mirror.racket-lang.org/installers/8.7/racket-8.7-x86_64-macosx-cs.
==> Installing Cask racket
[...]
racket was successfully installed!
```
- The "instead of deprecated ..." messaging comes from the `TapLoader`
class `formula_name_path` method, so _something_ must be assuming
that everything is initially a formula before _later_ learning from
further args parsing that there's a `--cask` qualifier to scope to
only casks.
- There are always `@formula_options` and args parsing is recursive,
going through each option, so we check that the original `argv` items
include a `--cask` and skip calling the `formulae` method if that's
the case.
- After this change, the "formula renames" words no longer show up.
```
$ brew install --cask racket
==> Downloading https://mirror.racket-lang.org/installers/8.7/racket-8.7-aarch64-macosx-cs.dmg
==> Installing Cask racket
[...]
racket was successfully installed!
```
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.
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