system-packages: link applications to ~/Applications

default.nix

@@ -27,6 +27,7 @@ let
         ./modules/system/defaults/dock.nix
         ./modules/system/defaults/finder.nix
         ./modules/system/defaults/trackpad.nix
+        ./modules/system/applications.nix
         ./modules/system/etc.nix
         ./modules/system/launchd.nix
         ./modules/time

modules/system/activation-scripts.nix

@@ -56,6 +56,7 @@ in
       ${cfg.activationScripts.nix.text}
 
       ${cfg.activationScripts.accessibility.text}
+      ${cfg.activationScripts.applications.text}
       ${cfg.activationScripts.etc.text}
       ${cfg.activationScripts.launchd.text}
       ${cfg.activationScripts.time.text}

modules/system/applications.nix

@@ -0,0 +1,35 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.system;
+
+in
+
+{
+  options = {
+  };
+
+  config = {
+
+    system.build.applications = pkgs.buildEnv {
+      name = "system-applications";
+      paths = config.environment.systemPackages;
+      pathsToLink = "/Applications";
+    };
+
+    system.activationScripts.applications.text = ''
+      # Set up applications.
+      echo "setting up ~/Applications..." >&2
+
+      if [ -d ~/Applications ]; then
+        echo "warning: ~/Applications is a directory, skipping..." >&2
+      else
+        ln -sfn ${cfg.build.applications}/Applications ~/Applications
+      fi
+    '';
+
+  };
+}

modules/system/default.nix

@@ -91,6 +91,7 @@ in
         ln -s ${cfg.path} $out/sw
 
         mkdir -p $out/Library
+        ln -s ${cfg.build.applications}/Applications $out/Applications
         ln -s ${cfg.build.launchd}/Library/LaunchAgents $out/Library/LaunchAgents
         ln -s ${cfg.build.launchd}/Library/LaunchDaemons $out/Library/LaunchDaemons