forked from lix-project/lix
Rebecca Turner
727b43478c
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:
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|---|---|---|
| .. | ||
| better-errors-in-nix-repl.md | ||
| debugger-locals-for-let-expressions.md | ||
| debugger-on-trace.md | ||
| drop-vendored-toml11.md | ||
| drv-string-parse-hang.md | ||
| dup-attr-errors.md | ||
| empty-search-regex.md | ||
| enter-debugger-more-reliably-in-let-and-calls.md | ||
| env-size-reduction.md | ||
| eval-system.md | ||
| forbid-nested-debuggers.md | ||
| formal-order.md | ||
| inherit-error-positions.md | ||
| inherit-from-by-need.md | ||
| nix-env-json-drv-path.md | ||
| nix-flake-check-logs-actions.md | ||
| nix-flake-update-ux.md | ||
| nixversion-fake.md | ||
| no-cache-eval-errors.md | ||
| print-value-in-coercion-error.md | ||
| print-value-in-type-error.md | ||
| reduce-debugger-clutter.md | ||
| repl-doc-command.md | ||
| repl-overlays.md | ||
| short-expr-flag.md | ||
| source-location-in-while-evaluating-attribute.md | ||
| source-positions-in-errors.md | ||
| stack-overflow-segfaults.md | ||
| upstart-removal.md | ||
| with-error-reporting.md | ||