More reorganizing

darwin/bootstrap.nix

@@ -23,22 +23,24 @@
     trusted-users = [
       "@admin"
     ];
+    # TODO: remove and replace with a launchd job
+    # see https://github.com/NixOS/nix/issues/7273
     auto-optimise-store = true;
     experimental-features = [ "nix-command" "flakes" ];
     extra-platforms = lib.mkIf (pkgs.system == "aarch64-darwin") [ "x86_64-darwin" "aarch64-darwin" ];
   };
   nix.configureBuildUsers = true;
 
-
   # Auto upgrade nix package and the daemon service.
   services.nix-daemon.enable = true;
 
   # Make Fish the default shell
-  environment.shells = with pkgs; [
+  environment.shells = lib.mkForce (builtins.attrValues {
-    bashInteractive
+    inherit (pkgs)
-    fish
+      bashInteractive
-    zsh
+      fish
-  ];
+      zsh;
+  });
 
   programs.fish.enable = true;
   programs.fish.useBabelfish = true;

darwin/homebrew.nix

@@ -1,4 +1,9 @@
-{ config, pkgs, ... }: {
+{ config, pkgs, lib, ... }:
+let
+  inherit (config.users) primaryUser;
+  caskPresent = cask: lib.any (x: x.name == cask) config.homebrew.casks;
+in
+{
   environment.shellInit = ''
     eval "$(${config.homebrew.brewPrefix}/brew shellenv)"
   '';
@@ -73,6 +78,20 @@
     # "zoom"
   ];
 
+  home-manager.users.${primaryUser.username} =
+    let
+      socket = "${primaryUser.homeDirectory}/Library/Containers/com.maxgoedjen.Secretive.SecretAgent/Data/socket.ssh";
+    in
+    lib.mkIf (caskPresent "secretive" && config ? home-manager) {
+      home.sessionVariables.SSH_AUTH_SOCKET = socket;
+      programs.ssh = {
+        enable = true;
+        matchBlocks."*".extraOptions = {
+          IdentityAgent = socket;
+        };
+      };
+    };
+
   # For cli packages that aren't currently available for macOS in `nixpkgs`.Packages should be
   # installed in `../home/programs.nix` whenever possible.
   homebrew.brews = [

flake.lock

@@ -39,11 +39,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1668784520,
+        "lastModified": 1671196037,
-        "narHash": "sha256-gGgVAMwYPPmrfnvnoRi6OkEB5KRsNTb9uYzEceLdO/g=",
+        "narHash": "sha256-2+J98SeczFWonbqFLMEAQC7vZEe6I2gM17XYvEmG52I=",
         "owner": "lnl7",
         "repo": "nix-darwin",
-        "rev": "6349b99bc2b96ded34d068a88c7c5ced406b7f7f",
+        "rev": "adb8ac0453c8b2c40f5bffb578453dbaee838952",
         "type": "github"
       },
       "original": {
@@ -244,11 +244,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1671493763,
+        "lastModified": 1671579194,
-        "narHash": "sha256-xw8cemaLh9Nda9usE0z3sxeiDUuXZ1zDiO6md3i7XLg=",
+        "narHash": "sha256-Cpm5tjSfBWOyAUvKcTRk6++U6n2ADkvro7jvfFJe3ps=",
         "owner": "helix-editor",
         "repo": "helix",
-        "rev": "bdeefbfb23077fcbbfe1e7df6c6ac88516244bbc",
+        "rev": "6ab8591715daf932d0dc45d0d5fb9e5a272f2fe1",
         "type": "github"
       },
       "original": {
@@ -267,11 +267,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1670513770,
+        "lastModified": 1671578428,
-        "narHash": "sha256-muL74fsbGA8K8WlZSPNWddOiuBnC54kAajncX6nXrh4=",
+        "narHash": "sha256-YmbpBcPaGz9KE2bC4xPvSdgCSMk0BmS/L3ePvy9TR/M=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "054d9e3187ca00479e8036dc0e92900a384f30fd",
+        "rev": "0f8bf4f92efa3c6168705b49a6788abb3612033a",
         "type": "github"
       },
       "original": {
@@ -372,11 +372,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1671268780,
+        "lastModified": 1671458120,
-        "narHash": "sha256-9Okbivo10bcXEGCtmAQNfJt1Zpk6B3tjkSQ2CIXmTCg=",
+        "narHash": "sha256-2+k/OONN4OF21TeoNjKB5sXVZv6Zvm/uEyQIW9OYCg8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "80c24eeb9ff46aa99617844d0c4168659e35175f",
+        "rev": "e37ef84b478fa8da0ced96522adfd956fde9047a",
         "type": "github"
       },
       "original": {
@@ -406,11 +406,11 @@
     },
     "nixpkgs-master": {
       "locked": {
-        "lastModified": 1670797596,
+        "lastModified": 1671578743,
-        "narHash": "sha256-lc4b690J8iiYnNToc5j39N6gt3k9lQUDxe0D6Wzuj9k=",
+        "narHash": "sha256-kNtZiBrKuaepKEtix+6mM6JJxF6iU+MAdqc/fmZS1aU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fb83ee7d26bee200b2bd6b69df390c57dee4b6af",
+        "rev": "5b727aeb18b7896e852866be0abb9a9f5b10c9a3",
         "type": "github"
       },
       "original": {
@@ -422,48 +422,16 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1659446231,
+        "lastModified": 1671391912,
-        "narHash": "sha256-hekabNdTdgR/iLsgce5TGWmfIDZ86qjPhxDg/8TlzhE=",
+        "narHash": "sha256-W8sbJuN/i+OZdRuIzDiIyKOqVB/G26zh9DQL1rfp2xk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "eabc38219184cc3e04a974fe31857d8e0eac098d",
+        "rev": "09e8ac77744dd036e58ab2284e6f5c03a6d6ed41",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixpkgs-21.11-darwin",
+        "ref": "nixpkgs-22.11-darwin",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-stable_2": {
-      "locked": {
-        "lastModified": 1668984258,
-        "narHash": "sha256-0gDMJ2T3qf58xgcSbYoXiRGUkPWmKyr5C3vcathWhKs=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "cf63ade6f74bbc9d2a017290f1b2e33e8fbfa70a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-22.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1668994630,
-        "narHash": "sha256-1lqx6HLyw6fMNX/hXrrETG1vMvZRGm2XVC9O/Jt0T6c=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "af50806f7c6ab40df3e6b239099e8f8385f6c78b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -475,15 +443,19 @@
           "flake-utils"
         ],
         "gitignore": "gitignore",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": [
-        "nixpkgs-stable": "nixpkgs-stable_2"
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": [
+          "nixpkgs-stable"
+        ]
       },
       "locked": {
-        "lastModified": 1670413394,
+        "lastModified": 1671452357,
-        "narHash": "sha256-M7sWqrKtOqUv9euX1t3HCxis8cPy9MNiZxQmUf0KF1o=",
+        "narHash": "sha256-HqzXiQEegpRQ4VEl9pEPgHSIxhJrNJ27HfN1wOc7w2E=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "1303a1a76e9eb074075bfe566518c413f6fc104e",
+        "rev": "200790e9c77064c53eaf95805b013d96615ecc27",
         "type": "github"
       },
       "original": {

flake.nix

@@ -4,7 +4,7 @@
   inputs = {
     # Package sets
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixpkgs-21.11-darwin";
+    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixpkgs-22.11-darwin";
     nixpkgs-master.url = "github:NixOS/nixpkgs/master";
 
     # Flake helpers
@@ -22,6 +22,8 @@
 
     # pre-commit and hooks
     pre-commit.url = "github:cachix/pre-commit-hooks.nix";
+    pre-commit.inputs.nixpkgs.follows = "nixpkgs";
+    pre-commit.inputs.nixpkgs-stable.follows = "nixpkgs-stable";
     pre-commit.inputs.flake-utils.follows = "flake-utils";
 
     # Extra sources
@@ -41,7 +43,6 @@
 
   outputs =
     { self
-    , home-manager
     , flake-utils
     , pre-commit
     , ...
@@ -61,12 +62,10 @@
       # Configuration for `nixpkgs`
       nixpkgsConfig = {
         config = { allowUnfree = true; };
-        overlays = attrValues self.overlays ++ [
+        overlays = attrValues self.overlays;
-          (import ./pkgs { inherit inputs; })
-        ];
       };
 
-      homeManagerStateVersion = "22.05";
+      homeStateVersion = "22.05";
 
       primaryUserInfo = {
         username = "mat";
@@ -80,115 +79,96 @@
         email = "mess@yelp.com";
       };
 
-      # Modules shared by most `nix-darwin` personal configurations.
+      # helper for defining nix-darwin systems
-      nixDarwinCommonModules = attrValues self.darwinModules ++ [
+      mkDarwinSystem =
-        # `home-manager` module
+        { modules ? [ ]
-        home-manager.darwinModules.home-manager
+        , homeModules ? [ ]
-        (
+        , ...
-          { config, ... }:
+        }@args: import ./lib/mkDarwinSystem.nix self inputs nixpkgsConfig (args // {
-          let
+          inherit homeStateVersion;
-            inherit (config.users) primaryUser;
+          modules = attrValues self.darwinModules ++ modules;
-          in
+          homeModules = attrValues self.homeManagerModules ++ homeModules;
-          {
+        });
-            nixpkgs = nixpkgsConfig;
-            # Hack to support legacy worklows that use `<nixpkgs>`, darwin-option, etc.
-            nix.nixPath = {
-              nixpkgs = "${inputs.nixpkgs}";
-              darwin = "${inputs.darwin}";
-            };
-            # `home-manager` config
-            users.users.${primaryUser.username}.home = primaryUser.homeDirectory;
-            home-manager.useGlobalPkgs = true;
-            home-manager.users.${primaryUser.username} = {
-              imports = attrValues self.homeManagerModules;
-              home.stateVersion = homeManagerStateVersion;
-              home.primaryUser = primaryUser;
-              home.homeDirectory = primaryUser.homeDirectory;
-              home.enableNixpkgsReleaseCheck = true;
-            };
-            # Add a registry entry for this flake
-            nix.registry.my.flake = self;
-          }
-        )
-      ];
     in
     {
       # `nix-darwin` configs
-      darwinConfigurations = rec {
+      darwinConfigurations =
-        # Mininal configurations to bootstrap systems
+        let
-        bootstrap-x86 = makeOverridable darwinSystem {
+          bootstrap-x86 = makeOverridable darwinSystem {
-          system = "x86_64-darwin";
+            system = "x86_64-darwin";
-          modules = [ ./darwin/bootstrap.nix { nixpkgs = nixpkgsConfig; } ];
+            modules = [ ./darwin/bootstrap.nix { nixpkgs = nixpkgsConfig; } ];
+          };
+        in
+        {
+          # Mininal configurations to bootstrap systems
+          inherit bootstrap-x86;
+          bootstrap-arm = bootstrap-x86.override { system = "aarch64-darwin"; };
+
+          # M1 MBP
+          matbook = mkDarwinSystem {
+            primaryUser = primaryUserInfo;
+            modules = [
+              ({ pkgs, ... }: {
+                networking.computerName = "matbook pro m1";
+                networking.hostName = "matbook";
+                networking.knownNetworkServices = [
+                  "Wi-Fi"
+                ];
+                nix.settings.cores = 2;
+                nix.settings.max-jobs = 4;
+
+                homebrew.casks = [
+                  # games
+                  "gog-galaxy"
+                  "origin"
+                  "sony-ps-remote-play"
+                  "steam"
+                ];
+                home-manager.sharedModules = [{
+                  programs.fish.shellAliases = {
+                    code = "${pkgs.vscodium}/bin/codium";
+                  };
+                  programs.ssh.matchBlocks.remarkable = {
+                    hostname = "10.11.99.1";
+                    user = "root";
+                    port = 22;
+                  };
+                  programs.vscode.package = pkgs.vscodium;
+                }];
+              })
+            ];
+          };
+
+          yelpbook-m1 = mkDarwinSystem {
+            primaryUser = workUserInfo;
+            modules = [
+              ({ pkgs, lib, ... }: {
+                users.primaryUser = workUserInfo;
+                networking.knownNetworkServices = [
+                  "Wi-Fi"
+                ];
+                nix.settings.cores = 2;
+                nix.settings.max-jobs = 5;
+
+                homebrew.casks = [ "itsycal" ];
+                home-manager.sharedModules = [{
+                  # TODO: how to remove this entirely?
+                  home.file.".tarsnaprc" = lib.mkForce { text = ""; };
+                  home.packages = [ pkgs.yubiswitch ];
+                  programs.ssh.matchBlocks.devbox = {
+                    hostname = "csdev4";
+                    forwardAgent = true;
+                    serverAliveInterval = 120;
+                  };
+                  programs.fish.functions.devbox.body = ''
+                    ssh -t devbox "agenttmux attach; or agenttmux new -s yelp"
+                  '';
+                  launchd.agents.tarsnap.enable = lib.mkForce false;
+                }];
+              })
+            ];
+          };
         };
-        bootstrap-arm = bootstrap-x86.override { system = "aarch64-darwin"; };
-
-        # M1 MBP
-        matbook = darwinSystem {
-          system = "aarch64-darwin";
-          modules = nixDarwinCommonModules ++ [
-            ({ pkgs, ... }: {
-              users.primaryUser = primaryUserInfo;
-              networking.computerName = "matbook pro m1";
-              networking.hostName = "matbook";
-              networking.knownNetworkServices = [
-                "Wi-Fi"
-              ];
-              nix.settings.cores = 2;
-              nix.settings.max-jobs = 4;
-
-              homebrew.casks = [
-                # games
-                "gog-galaxy"
-                "origin"
-                "sony-ps-remote-play"
-                "steam"
-              ];
-              home-manager.sharedModules = [{
-                programs.fish.shellAliases = {
-                  code = "${pkgs.vscodium}/bin/codium";
-                };
-                programs.ssh.matchBlocks.remarkable = {
-                  hostname = "10.11.99.1";
-                  user = "root";
-                  port = 22;
-                };
-                programs.vscode.package = pkgs.vscodium;
-              }];
-            })
-          ];
-        };
-
-        yelpbook-m1 = darwinSystem {
-          system = "aarch64-darwin";
-          modules = nixDarwinCommonModules ++ [
-            ({ pkgs, lib, ... }: {
-              users.primaryUser = workUserInfo;
-              networking.knownNetworkServices = [
-                "Wi-Fi"
-              ];
-              nix.settings.cores = 2;
-              nix.settings.max-jobs = 5;
-
-              homebrew.casks = [ "itsycal" ];
-              home-manager.sharedModules = [{
-                # TODO: how to remove this entirely?
-                home.file.".tarsnaprc" = lib.mkForce { text = ""; };
-                home.packages = builtins.attrValues { inherit (pkgs) yubiswitch; };
-                programs.ssh.matchBlocks.devbox = {
-                  hostname = "csdev4";
-                  forwardAgent = true;
-                  serverAliveInterval = 120;
-                };
-                programs.fish.functions.devbox.body = ''
-                  ssh -t devbox "agenttmux attach; or agenttmux new -s yelp"
-                '';
-                launchd.agents.tarsnap.enable = lib.mkForce false;
-              }];
-            })
-          ];
-        };
-
-      };
 
       # Overlays --------------------------------------------------------------- {{{
 
@@ -229,6 +209,8 @@
         homebrew-enabled = _: prev: optionalAttrs prev.stdenv.isDarwin {
           lib = prev.lib // { homebrew-enabled = inputs.homebrew-enabled.value; };
         };
+
+        extra-pkgs = import ./pkgs { inherit inputs; };
       };
 
       # `nix-darwin` configs and modules
@@ -263,24 +245,9 @@
         home-primary-user = mkPrimaryUserModule "home";
       };
 
-      templates = {
+      templates = import ./templates;
-        rust = {
+    } // flake-utils.lib.eachDefaultSystem (system: {
-          description = "A rust flake template based on flake.parts";
+      legacyPackages = import inputs.nixpkgs (nixpkgsConfig // { inherit system; });
-          welcomeText = ''
-            welcome to a new rust project ミ(・・)ミ
-
-            run `direnv allow` and `cargo init` to start a new project
-          '';
-          path = ./templates/rust;
-        };
-      };
-
-    } // flake-utils.lib.eachDefaultSystem (system:
-    let
-      pkgs = import inputs.nixpkgs (nixpkgsConfig // { inherit system; });
-    in
-    {
-      legacyPackages = pkgs;
 
       checks.pre-commit = pre-commit.lib.${system}.run {
         src = ./.;
@@ -292,7 +259,7 @@
         };
       };
 
-      devShells = {
+      devShells = let pkgs = self.legacyPackages.${system}; in {
         default = pkgs.mkShell {
           inherit (self.checks.${system}.pre-commit) shellHook;
         };

home/fish.nix

@@ -138,7 +138,6 @@
   programs.fish.shellAliases =
     let
       inherit (config.home.primaryUser) nixConfigDirectory;
-      inherit (pkgs) bat bottom du-dust exa gitAndTools stdenv xh;
     in
     {
       # Nix related
@@ -170,18 +169,18 @@
       # Other
       ".." = "cd ..";
       ":q" = "exit";
-      cat = "${bat}/bin/bat --style=plain --paging=never";
+      cat = "${pkgs.bat}/bin/bat --style=plain --paging=never";
-      du = "${du-dust}/bin/dust";
+      du = "${pkgs.du-dust}/bin/dust";
-      g = "${gitAndTools.git}/bin/git";
+      g = "${pkgs.gitAndTools.git}/bin/git";
-      ls = "${exa}/bin/exa";
+      ls = "${pkgs.exa}/bin/exa";
       ll = "ls -l --time-style long-iso --icons";
       la = "ll -a";
-      http = "${xh}/bin/xh";
+      http = "${pkgs.xh}/bin/xh";
-      https = "${xh}/bin/xhs";
+      https = "${pkgs.xh}/bin/xhs";
-      top = "${bottom}/bin/btm";
+      top = "${pkgs.bottom}/bin/btm";
-      htop = "${bottom}/bin/btm";
+      htop = "${pkgs.bottom}/bin/btm";
       tb = "toggle-background";
-    } // lib.optionalAttrs stdenv.isDarwin {
+    } // lib.optionalAttrs pkgs.stdenv.isDarwin {
       sb = "set-background-to-macOS";
       conda-init = "eval /opt/homebrew/bin/conda 'shell.fish' 'hook' $argv | source";
     };
@@ -193,7 +192,7 @@
   '';
 
   programs.fish.interactiveShellInit = ''
-    set -g fish_greeting (set_color blue)"(づ￣ ³￣)づ "(set_color red)"h"(set_color cyan)"e"(set_color yellow)"l"(set_color magenta)"l"(set_color green)"o "(set_color blue)"(づ￣ ³￣)づ"(set_color normal)
+    set -g fish_greeting (set_color blue)"(づ￣ ³￣)づ "(set_color cyan)"h"(set_color red)"e"(set_color yellow)"l"(set_color green)"l"(set_color magenta)"o "(set_color blue)"(づ￣ ³￣)づ"(set_color normal)
     fish_vi_key_bindings
     set VIRTUAL_ENV_DISABLE_PROMPT true
     bind -M insert ! __history_previous_command

home/programs.nix

@@ -1,13 +1,5 @@
-{ config, pkgs, lib, ... }:
+{ pkgs, lib, ... }: {
-
-let
-  secretiveAuthSocket = "${config.home.homeDirectory}/Library/Containers/com.maxgoedjen.Secretive.SecretAgent/Data/socket.ssh";
-in
-{
   # Programs + packages with configuration --------------------------------------------------------------- {{{
-  home.sessionVariables = lib.optionalAttrs pkgs.stdenv.isDarwin {
-    SSH_AUTH_SOCK = secretiveAuthSocket;
-  };
   programs = {
     # a nicer cat
     # https://rycee.gitlab.io/home-manager/options.html#opt-programs.bat.enable
@@ -33,7 +25,6 @@ in
       matchBlocks."*".extraOptions = lib.optionalAttrs pkgs.stdenv.isDarwin {
         UseKeychain = "yes";
         AddKeysToAgent = "yes";
-        IdentityAgent = secretiveAuthSocket;
       };
     };
     # vscode
@@ -50,55 +41,84 @@ in
 
   # Other packages ----------------------------------------------------------------------------- {{{
 
-  home.packages = with pkgs; [
+  home.packages = builtins.attrValues ({
-    # GUI apps
+    coreutils = pkgs.coreutils.override { withPrefix = true; singleBinary = "shebangs"; };
-    discord-ptb
+    inherit (pkgs)
-    element-desktop
+      # GUI apps
-    lagrange
+      discord-ptb
-    obsidian
+      element-desktop
-    slack
+      lagrange
-    zoom-us
+      obsidian
+      slack
+      zoom-us
 
-    # System
+      # System
-    abduco # lightweight session management
+      # lightweight session management
-    atool # archive tool
+      abduco
-    bottom # fancy version of `top` with ASCII graphs
+      # archive tool
-    # do i need these?
+      atool
-    # coreutils
+      # fancy version of `top` with ASCII graphs
-    curl
+      bottom
-    du-dust # fancy version of `du`
+      curl
-    exa # fancy version of `ls`
+      # fancy version of `du`
-    fd # fancy version of `find`
+      du-dust
-    mosh # wrapper for `ssh` that better at not dropping connections
+      # fancy version of `ls`
-    procs # fancy version of `ps`
+      exa
-    pv # pipe progress viewer
+      # fancy version of `find`
-    rage # command line file encryption
+      fd
-    thefuck
+      # wrapper for `ssh` that better at not dropping connections
-    unrar # extract RAR archives
+      mosh
-    wget
+      # fancy version of `ps`
-    xz # extract XZ archives
+      procs
+      # pipe progress viewer
+      pv
+      # command line file encryption
+      rage
+      thefuck
+      # extract RAR archives
+      unrar
+      wget
+      # extract XZ archives
+      xz
 
-    # Dev stuff
+      # Dev stuff
-    cloc # source code line counter
+      # source code line counter
-    doctl # command line tools for digitalocean
+      cloc
-    flyctl # command line tools for fly.io
+      # command line tools for digitalocean
-    hyperfine # benchmarking tool
+      doctl
-    jq # json processor
+      # command line tools for fly.io
-    pijul # alternative to `git`
+      flyctl
-    ripgrep # better version of `grep`
+      # benchmarking tool
-    tealdeer # rust implementation of `tldr`
+      hyperfine
-    xh # reimplementation of `httpie` in rust
+      # json processor
+      jq
+      # alternative to `git`
+      pijul
+      # better version of `grep`
+      ripgrep
+      # rust implementation of `tldr`
+      tealdeer
+      # reimplementation of `httpie` in rust
+      xh
 
-    # Useful nix related tools
+      # Useful nix related tools
-    cachix # adding/managing alternative binary caches hosted by Cachix
+      # adding/managing alternative binary caches hosted by Cachix
-    comma # run software from nixpkgs without installing it
+      cachix
-    nixpkgs-fmt
+      # run software from nixpkgs without installing it
-    nix-prefetch-git
+      comma
-    nix-tree
+      nixpkgs-fmt
-    nil # nix language server
+      nix-prefetch-git
-  ] ++ lib.optionals stdenv.isDarwin [
+      nix-tree
-    m-cli # useful macOS CLI commands
+      # nix language server
-    is-dark-mode # see /overlays/colors.nix
+      nil
-  ];
+      ;
+  } // lib.optionalAttrs pkgs.stdenv.isDarwin {
+    inherit (pkgs)
+      # useful macOS CLI commands
+      m-cli
+      # see /overlays/colors.nix
+      is-dark-mode
+      ;
+  });
   # }}}
 }

lib/mkDarwinSystem.nix

@@ -0,0 +1,56 @@
+# taken from https://github.com/malob/nixpkgs/blob/27e04346555277687a60c0168969b3945c2b25ba/lib/mkDarwinSystem.nix
+self: inputs: nixpkgs:
+
+{ primaryUser
+, system ? "aarch64-darwin"
+
+  # `nix-darwin` modules to include
+, modules ? [ ]
+  # Additional `nix-darwin` modules to include, useful when reusing a configuration with
+  # `lib.makeOverridable`.
+, extraModules ? [ ]
+
+  # Value for `home-manager`'s `home.stateVersion` option.
+, homeStateVersion
+  # `home-manager` modules to include
+, homeModules ? [ ]
+  # Additional `home-manager` modules to include, useful when reusing a configuration with
+  # `lib.makeOverridable`.
+, extraHomeModules ? [ ]
+}:
+
+inputs.darwin.lib.darwinSystem {
+  inherit system;
+  modules = modules ++ extraModules ++ [
+    inputs.home-manager.darwinModules.home-manager
+    ({ config, ... }:
+      let cfg = config.users.primaryUser; in
+      {
+        users.primaryUser = primaryUser;
+
+        inherit nixpkgs;
+
+        # Support legacy workflows that use `<nixpkgs>` etc.
+        nix.nixPath = {
+          nixpkgs = "${inputs.nixpkgs}";
+          darwin = "${inputs.darwin}";
+        };
+
+        # `home-manager` config
+        users.users.${cfg.username}.home = cfg.homeDirectory;
+        home-manager.useGlobalPkgs = true;
+        home-manager.useUserPackages = true;
+        home-manager.users.${cfg.username} = {
+          imports = homeModules ++ extraHomeModules;
+          home.stateVersion = homeStateVersion;
+          home.primaryUser = primaryUser;
+          home.homeDirectory = cfg.homeDirectory;
+          home.enableNixpkgsReleaseCheck = true;
+        };
+        # Make sure nixpkgs#pkg refers to this nixpkgs
+        nix.registry.nixpkgs.flake = inputs.nixpkgs;
+        # Add this flake to the registry
+        nix.registry.my.flake = self;
+      })
+  ];
+}

templates/default.nix

@@ -0,0 +1,11 @@
+{
+  rust = {
+    description = "A rust flake template based on flake.parts";
+    welcomeText = ''
+      welcome to a new rust project ミ(・・)ミ
+
+      run `direnv allow` and `cargo init` to start a new project
+    '';
+    path = ./templates/rust;
+  };
+}