chore: use flake-utils

to provide better support for different platforms.

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1609246779,
+        "narHash": "sha256-eq6ZXE/VWo3EMC65jmIT6H/rrUc9UWOWVujkzav025k=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "08c7ad4a0844adc4a7f9f5bb3beae482e789afa4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1609542771,
+        "narHash": "sha256-OcV1R1wnVDHFOzBib8tbPAbfDU5D3G6yIXV4Kr036XI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "014440d7105ce2be945b79dc957dd08720a9c029",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -1,37 +1,29 @@
 {
   description = "Poetry2nix flake";
 
-  outputs = { self, nixpkgs }:
+  inputs.flake-utils.url = "github:numtide/flake-utils";
-    let
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
-      # TODO: There must be a better way to provide arch-agnostic flakes..
+
-      systems = [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ];
+  outputs = { self, nixpkgs, flake-utils }:
-      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
-      # Memoize nixpkgs for different platforms for efficiency.
-      nixpkgsFor = forAllSystems (
-        system:
-        import nixpkgs {
-          inherit system;
-          overlays = [ self.overlay ];
-        }
-      );
-    in
     {
       overlay = import ./overlay.nix;
-
+    } // (flake-utils.lib.eachDefaultSystem (system:
-      packages = forAllSystems (system: {
+      let
-        inherit (nixpkgsFor.${system}) poetry;
+        myNixpkgs = import nixpkgs {
-      }
+          inherit system;
-      );
+          overlays = [ self.overlay ];
-
-      apps = forAllSystems (system: {
-        poetry = {
-          type = "app";
-          program = self.packages."${system}".poetry + "/bin/poetry";
         };
-      });
+      in
-
+      rec {
-      defaultApp = forAllSystems (system:
+        packages = {
-        self.apps."${system}".poetry
+          inherit (myNixpkgs) poetry;
-      );
         };
+        defaultPackage = packages.poetry;
+
+        apps = {
+          poetry = flake-utils.lib.mkApp { drv = packages.poetry; };
+        };
+
+        defaultApp = apps.poetry;
+      }));
 }