forked from lix-project/lix
Rebecca Turner
e2a1f79490
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
Nix 2.21.0pre20240309_4111bb6
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:
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|---|---|---|
| .. | ||
| extra_data | ||
| basic.ast | ||
| basic.test | ||
| basic_repl.test | ||
| basic_tidied.ast | ||
| basic_tidied.test | ||
| regression_9917.nix | ||
| regression_9917.test | ||
| regression_9918.nix | ||
| regression_9918.test | ||
| regression_l145.nix | ||
| regression_l145.test | ||
| repl_overlays.nix | ||
| repl_overlays.test | ||
| repl_overlays_compose.nix | ||
| repl_overlays_compose.test | ||
| repl_overlays_destructure_without_dotdotdot_errors.test | ||
| repl_overlays_destructure_without_formals_ok.test | ||
| repl_overlays_error.test | ||
| stack_vars.nix | ||
| stack_vars.test | ||