nixos/lib/default.nix

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Nix
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final: prev:
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let
inherit (prev) isFunction;
in
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rec {
# Ternary operator
# Exaample:
# tern false 1 2 => 2
# tern true 1 2 => 1
tern = pred: x: y: if pred then x else y;
# Right-associate and chain following single-operand functions
# Example:
# right f g h 1 => f(g(h(1)))
right = f: g: tern (isFunction g)
(right (x: f (g (x))))
(f (g));
}