[Rpm-maint] [rpm-software-management/rpm] How to expand possibly non-existent user constructed variable name? (Discussion #3411)

[Panu Matilainen]

> Funnily enough, we were forced to use Lua for [c9s](https://gitlab.com/redhat/centos-stream/rpms/ruby/-/blob/stream-ruby-3.3-rhel-9.6.0/macros.rubygems?ref_type=heads#L15), because RPM does not support %{sub:...} there. ATM, I don't think it is more readable nor shorter. But admittedly, it could also be written different way ...

Yeah you'd want to write the whole macro in Lua, not just parts of it. And format like you would do regular code - just as a silly example:
```
%mymacro() %{lua:
    function helper(myarg)
        return myarg.."-helper"
    end

    if arg[1] then
        print(helper(arg[1]))
    else
        print("no arguments")
    end
}
```

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