Alex Hedges 5ed06a7956 Handle undeclared POSIXLY_CORRECT in Bash completions
As of `brew` 4.0.2, sourcing the Bash completions with `set -eu` causes a
failure if `POSIXLY_CORRECT` is not declared. The check will now
properly handle this situation.

I'm not sure if the resulting code is POSIX-compliant, but it prevents a
breaking change until a better solution can be found.
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Homebrew Ruby API

This is the API for Homebrew.

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.

You may also find the Formula Cookbook and Ruby Style Guide helpful in creating formulae.

Good luck!