[Nix-dev] Function to look up symbols dynamically?

[Bryan Ferris]

Hello,

I see in the Nix manual that hasAttr and getAttr exist to allow developers
to dynamically access elements of sets. However, I could not find any
equivalent function for dynamically getting a variable. For example, being
able to say:

(lookup "programs").zsh = { enable = true; }

Of course, the above usage is not useful, but it becomes useful if you
replace the "programs" string with a variable.

Is there any way to achieve this in Nix?

Thanks,
Bryan
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