From 1da7187b780670868274864a94391b168221d3dd Mon Sep 17 00:00:00 2001
From: sgiath <sgiath@sgiath.dev>
Date: Sat, 16 Mar 2024 08:54:11 +0000
Subject: [PATCH] feat: update Elixir template

Signed-off-by: sgiath <sgiath@sgiath.dev>
---
 elixir/flake.lock | 34 ++++++++++++++++++
 elixir/flake.nix  | 88 ++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 105 insertions(+), 17 deletions(-)

diff --git a/elixir/flake.lock b/elixir/flake.lock
index d4ecad3..7a0cc8f 100644
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1703013332,
@@ -16,8 +34,24 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/elixir/flake.nix b/elixir/flake.nix
index f83f706..912e459 100644
--- a/elixir/flake.nix
+++ b/elixir/flake.nix
@@ -1,25 +1,79 @@
 {
   description = "A Nix-flake-based Elixir development environment";
 
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs = {
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
-  outputs = { self, nixpkgs }:
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
     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; };
-      });
+      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 26
+      # erlang = pkgs.beam.interpreters.erlang_26;
+
+      # 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 preffered 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 1.16
+      # elixir = pkgs-beam.elixir_1_16;
+
+      # specify exact version of Elixir
+      # elixir = pkgs-beam.elixir.override {
+      #   version = "1.16.1";
+      #   sha256 = "sha256-rjUt3gCUszCbzGE7BriwH3ptrV81dqNB/d0nVOXrcGI=";
+      # };
     in
     {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = (with pkgs; [ elixir ]) ++
-            # 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 ]);
-        };
-      });
-    };
+      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.darwin.apple_sdk.frameworks; [ pkgs.terminal-notifier CoreFoundation CoreServices ]);
+
+        # some sane defaults for iex session
+        shellHooks = ''
+          export ERL_AFLAGS="+pc unicode -kernel shell_history enabled"
+          export ELIXIR_ERL_OPTIONS="+sssdio 128"
+        '';
+      };
+    }
+  );
 }