flake.nix
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flake.nix
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	{
	description = "Comm flake";

	inputs = {
	utils.url = "github:numtide/flake-utils";
	nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
	};

	outputs = { self, nixpkgs, utils, ... }:
	let
	# Overlays allow for extending a package set, in this case, we are
	# extending nixpkgs with our devShell
	localOverlay = import ./nix/overlay.nix;
	overlays = [
	localOverlay
	];

	# Since we build for many systems (e.g. aarch64, x86_64-linux), we
	# create a helper function to help facilitate instantiation of the related
	# package set
	pkgsForSystem = system: import nixpkgs {
	inherit overlays system;
	};

	# utils.lib.eachSystem helps create a result set of expected flake outputs
	# of the form <output>.<system>
	# https://github.com/numtide/flake-utils#usage for more examples
	in utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ] (system: rec {
	legacyPackages = pkgsForSystem system;
	inherit (legacyPackages) devShell;
	}) // {
	# these outputs will lack the system suffix (e.g.
	# devShell.aarch64-darwin), thus should be system agnostic such as
	# overlays or utility functions.
	overlays = { inherit localOverlay; };
	overlay = localOverlay;
	};
	}