Merge pull request #39 from Sgiath/main

elixir/flake.nix

@@ -1,27 +1,100 @@
 {
   description = "A Nix-flake-based Elixir development environment";
 
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-
-  outputs = { self, nixpkgs }:
-    let
-      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
-    in
-    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = (with pkgs; [ elixir ]) ++
+  inputs = {
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        # documentation
+        # https://nixos.org/manual/nixpkgs/stable/#sec-beam
+
+        # ==== ERLANG ====
+
+        # use whatever version is currently defined in nixpkgs
+        # erlang = pkgs.beam.interpreters.erlang;
+
+        # use latest version of Erlang 27
+        erlang = pkgs.beam.interpreters.erlang_27;
+
+        # specify exact version of Erlang OTP
+        # erlang = pkgs.beam.interpreters.erlang.override {
+        #   version = "26.2.2";
+        #   sha256 = "sha256-7S+mC4pDcbXyhW2r5y8+VcX9JQXq5iEUJZiFmgVMPZ0=";
+        # }
+
+        # ==== BEAM packages ====
+
+        # all BEAM packages will be compile with your preferred erlang version
+        pkgs-beam = pkgs.beam.packagesWith erlang;
+
+        # ==== Elixir ====
+
+        # use whatever version is currently defined in nixpkgs
+        # elixir = pkgs-beam.elixir;
+
+        # use latest version of Elixir 1.17
+        elixir = pkgs-beam.elixir_1_17;
+
+        # specify exact version of Elixir
+        # elixir = pkgs-beam.elixir.override {
+        #   version = "1.17.1";
+        #   sha256 = "sha256-a7A+426uuo3bUjggkglY1lqHmSbZNpjPaFpQUXYtW9k=";
+        # };
+
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages =
+            [
+              # use the Elixr/OTP versions defined above; will also install OTP, mix, hex, rebar3
+              elixir
+
+              # mix needs it for downloading dependencies
+              pkgs.git
+
+              # probably needed for your Phoenix assets
+              pkgs.nodejs_20
+            ]
+            ++
             # Linux only
-            (pkgs.lib.optionals (pkgs.stdenv.isLinux)
-              (with pkgs; [ gigalixir inotify-tools libnotify ])) ++
-            # macOS only
-            pkgs.lib.optionals (pkgs.stdenv.isDarwin)
-              ((with pkgs; [ terminal-notifier ]) ++
-                (with pkgs.darwin.apple_sdk.frameworks; [ CoreFoundation CoreServices ]));
+            pkgs.lib.optionals pkgs.stdenv.isLinux (
+              with pkgs;
+              [
+                gigalixir
+                inotify-tools
+                libnotify
+              ]
+            )
+            ++
+              # macOS only
+              pkgs.lib.optionals pkgs.stdenv.isDarwin (
+                with pkgs;
+                [
+                  terminal-notifier
+                  darwin.apple_sdk.frameworks.CoreFoundation
+                  darwin.apple_sdk.frameworks.CoreServices
+                ]
+              );
+
+          # some sane defaults for iex session
+          env = {
+            ERL_INCLUDE_PATH = "${erlang}/lib/erlang/usr/include";
+            ERL_AFLAGS = "+pc unicode -kernel shell_history enabled";
+            ELIXIR_ERL_OPTIONS = "+sssdio 128";
+          };
         };
-      });
-    };
+      }
+    );
 }