Nix and composition - Nix

Is there some nice way of composing functions, like the dot operator in Haskell, so I can avoid things like

modifier = drv: foo (bar (baz drv))

There's pipe in lib/trivial.nix, though I've never actually used it

https://github.com/NixOS/nixpkgs/blob/8252861507ef85b45f739c63f27d4e9a80b31b31/lib/trivial.nix#L32

You could also just inline something like

compose = f: g: x: f (g x);
composeAll = builtins.foldl' compose id;

I can't even figure out how to pull in trivial.pipe..

@Magnus Therning Assuming you have pkgs or something in scope, I think you'd say pkgs.lib.pipe

It's pretty new. You may not have it in your nixpkgs: https://github.com/NixOS/nixpkgs/commit/8252861507ef85b45f739c63f27d4e9a80b31b31

I managed to find it under pkgs.lib.trivial.