{ config, lib, flake-parts-lib, ... }: let inherit (lib) filterAttrs mapAttrs mkOption optionalAttrs types ; inherit (flake-parts-lib) mkSubmoduleOptions mkPerSystemOption ; in { options = { flake = mkSubmoduleOptions { devShells = mkOption { type = types.lazyAttrsOf (types.lazyAttrsOf types.package); default = { }; description = '' Per system an attribute set of packages used as shells. nix develop .#<name> will run devShells.<system>.<name>. ''; }; }; perSystem = mkPerSystemOption ({ config, system, ... }: { options = { devShells = mkOption { type = types.lazyAttrsOf types.package; default = { }; description = '' An attribute set of packages to be built by nix develop .#<name>. nix build .#<name> will run devShells.<name>. ''; }; }; }); }; config = { flake.devShells = mapAttrs (k: v: v.devShells) (filterAttrs (k: v: v.devShells != null) config.allSystems ); perInput = system: flake: optionalAttrs (flake?devShells.${system}) { devShells = flake.devShells.${system}; }; }; }