lix/src/libcmd/repl-overlays.nix

info:
initial:
functions:
let final = builtins.foldl'
              (prev: function: prev // (function info final prev))
              initial
              functions;
in final
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:`
			`initial:`
			`functions:`
			`let final = builtins.foldl'`
			`(prev: function: prev // (function info final prev))`
			`initial`
			`functions;`
			`in final`