lix/tests/functional/repl_characterization/data/extra_data/repl-overlays-compose-1.nix

info: final: prev:
{
  var = prev.var + "b";

  # We can access the final value of `var` here even though it isn't defined yet:
  varUsingFinal = "final value is: " + final.newVar;
}
Add `repl-overlays` Adds a `repl-overlays` option, which specifies files that can overlay and modify the top-level bindings in `nix repl`. For example, with the following contents in `~/.config/nix/repl.nix`: info: final: prev: let optionalAttrs = predicate: attrs: if predicate then attrs else {}; in optionalAttrs (prev ? legacyPackages && prev.legacyPackages ? ${info.currentSystem}) { pkgs = prev.legacyPackages.${info.currentSystem}; } We can run `nix repl` and use `pkgs` to refer to `legacyPackages.${currentSystem}`: $ nix repl --repl-overlays ~/.config/nix/repl.nix nixpkgs Lix 2.90.0 Type :? for help. Loading installable 'flake:nixpkgs#'... Added 5 variables. Loading 'repl-overlays'... Added 6 variables. nix-repl> pkgs.bash «derivation /nix/store/g08b5vkwwh0j8ic9rkmd8mpj878rk62z-bash-5.2p26.drv» Change-Id: Ic12e0f2f210b2f46e920c33088dfe1083f42391a 2024-04-04 23:26:25 +00:00			`info: final: prev:`
			`{`
			`var = prev.var + "b";`

			# We can access the final value of `var` here even though it isn't defined yet:
			`varUsingFinal = "final value is: " + final.newVar;`
			`}`