First Try

modules/darwin/dock/default.nix

@@ -0,0 +1,70 @@
+{ config, pkgs, lib, ... }:
+
+# Original source: https://gist.github.com/antifuchs/10138c4d838a63c0a05e725ccd7bccdd
+
+with lib;
+let
+  cfg = config.local.dock;
+  inherit (pkgs) stdenv dockutil;
+in
+{
+  options = {
+    local.dock.enable = mkOption {
+      description = "Enable dock";
+      default = stdenv.isDarwin;
+      example = false;
+    };
+
+    local.dock.entries = mkOption
+      {
+        description = "Entries on the Dock";
+        type = with types; listOf (submodule {
+          options = {
+            path = lib.mkOption { type = str; };
+            section = lib.mkOption {
+              type = str;
+              default = "apps";
+            };
+            options = lib.mkOption {
+              type = str;
+              default = "";
+            };
+          };
+        });
+        readOnly = true;
+      };
+  };
+
+  config =
+    mkIf cfg.enable
+      (
+        let
+          normalize = path: if hasSuffix ".app" path then path + "/" else path;
+          entryURI = path: "file://" + (builtins.replaceStrings
+            [" "   "!"   "\""  "#"   "$"   "%"   "&"   "'"   "("   ")"]
+            ["%20" "%21" "%22" "%23" "%24" "%25" "%26" "%27" "%28" "%29"]
+            (normalize path)
+          );
+          wantURIs = concatMapStrings
+            (entry: "${entryURI entry.path}\n")
+            cfg.entries;
+          createEntries = concatMapStrings
+            (entry: "${dockutil}/bin/dockutil --no-restart --add '${entry.path}' --section ${entry.section} ${entry.options}\n")
+            cfg.entries;
+        in
+        {
+          system.activationScripts.postUserActivation.text = ''
+            echo >&2 "Setting up the Dock..."
+            haveURIs="$(${dockutil}/bin/dockutil --list | ${pkgs.coreutils}/bin/cut -f2)"
+            if ! diff -wu <(echo -n "$haveURIs") <(echo -n '${wantURIs}') >&2 ; then
+              echo >&2 "Resetting Dock."
+              ${dockutil}/bin/dockutil --no-restart --remove all
+              ${createEntries}
+              killall Dock
+            else
+              echo >&2 "Dock setup complete."
+            fi
+          '';
+        }
+      );
+}