From 5f9bbb98916db6c1407fb86ad41168fd3706cd01 Mon Sep 17 00:00:00 2001
From: Daniel Kempkens <daniel+git@kempkens.io>
Date: Sun, 1 Oct 2023 17:34:28 +0200
Subject: [PATCH] darwin: Use mkalias to link apps

---
 flake.lock             | 21 +++++++++++++++++++++
 flake.nix              |  5 +++++
 home/hosts/Styx.nix    | 34 +++++++++++++++++++++++++++++++++-
 system/flakes/Styx.nix |  4 +++-
 4 files changed, 62 insertions(+), 2 deletions(-)

diff --git a/flake.lock b/flake.lock
index d3fdc48..0c97617 100644
--- a/flake.lock
+++ b/flake.lock
@@ -313,6 +313,26 @@
         "type": "github"
       }
     },
+    "mkalias": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1678761502,
+        "narHash": "sha256-tL3C/b2BPOGQpV287wECDCDWmKwwPvezAAN3qz7N07M=",
+        "owner": "reckenrode",
+        "repo": "mkalias",
+        "rev": "8a5478cdb646f137ebc53cb9d235f8e5892ea00a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "reckenrode",
+        "repo": "mkalias",
+        "type": "github"
+      }
+    },
     "neovim-flake": {
       "inputs": {
         "flake-utils": "flake-utils_2",
@@ -528,6 +548,7 @@
         "flake-parts": "flake-parts",
         "flake-root": "flake-root",
         "home-manager": "home-manager",
+        "mkalias": "mkalias",
         "nifoc-overlay": "nifoc-overlay",
         "nix-darwin": "nix-darwin",
         "nixos-hardware": "nixos-hardware",
diff --git a/flake.nix b/flake.nix
index f5f8250..fb1f353 100644
--- a/flake.nix
+++ b/flake.nix
@@ -62,6 +62,11 @@
       url = "github:serokell/deploy-rs";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    mkalias = {
+      url = "github:reckenrode/mkalias";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = inputs@{ flake-parts, ... }:
diff --git a/home/hosts/Styx.nix b/home/hosts/Styx.nix
index a09131c..af7576c 100644
--- a/home/hosts/Styx.nix
+++ b/home/hosts/Styx.nix
@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, lib, config, ... }:
 
 {
   imports = [
@@ -42,6 +42,8 @@
     ../programs/yt-dlp.nix
   ];
 
+  disabledModules = [ "targets/darwin/linkapps.nix" ];
+
   home = {
     stateVersion = "22.11";
 
@@ -75,5 +77,35 @@
       xxHash
       xz
     ];
+
+    activation.aliasApplications = lib.mkIf pkgs.stdenv.hostPlatform.isDarwin (
+      let
+        apps = pkgs.buildEnv {
+          name = "home-manager-applications";
+          paths = config.home.packages;
+          pathsToLink = "/Applications";
+        };
+
+        lastAppsFile = "${config.xdg.stateHome}/nix/.apps";
+      in
+      lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+        last_apps=$(cat "${lastAppsFile}" 2>/dev/null || echo "")
+        next_apps=$(readlink -f ${apps}/Applications/* | sort)
+
+        if [ "$last_apps" != "$next_apps" ]; then
+          echo "Apps have changed. Updating macOS aliases..."
+
+          apps_path="$HOME/Applications/Home Manager Apps"
+          $DRY_RUN_CMD mkdir -p "$apps_path"
+
+          $DRY_RUN_CMD ${pkgs.fd}/bin/fd \
+            -t l -d 1 . ${apps}/Applications \
+            -x $DRY_RUN_CMD "${pkgs.mkalias}/bin/mkalias" \
+            -L {} "$apps_path/{/}"
+
+          [ -z "$DRY_RUN_CMD" ] && echo "$next_apps" > "${lastAppsFile}"
+        fi
+      ''
+    );
   };
 }
diff --git a/system/flakes/Styx.nix b/system/flakes/Styx.nix
index 4608358..de1a2a1 100644
--- a/system/flakes/Styx.nix
+++ b/system/flakes/Styx.nix
@@ -4,8 +4,9 @@ let
   default-system = "aarch64-darwin";
 
   overlay-x86 = _: _: { pkgs-x86 = import nixpkgs { system = "x86_64-darwin"; }; };
-  overlay-agenix = inputs.agenix.overlays.default;
+  overlay-agenix = agenix.overlays.default;
   overlay-attic = inputs.attic.overlays.default;
+  overlay-mkalias = _: _: { inherit (inputs.mkalias.packages.${default-system}) mkalias; };
   overlay-nifoc = inputs.nifoc-overlay.overlay;
 
   nixpkgsConfig = {
@@ -13,6 +14,7 @@ let
       overlay-x86
       overlay-agenix
       overlay-attic
+      overlay-mkalias
       overlay-nifoc
     ];