[Nix-dev] Creating dependency trees.

[stewart mackenzie]

Okay this:

substituteInPlace lib/lib.subnet \
  --replace \( \ \(''$\{ \
  --replace \) \}\)

transforms this:

in => a nand (maths_boolean_nand) out => out
in => b nand ()

to:

in => a nand (${maths_boolean_nand}) out => out
in => b nand (${})