hjem/collection: add autostart module

shared/modules/hjem/collection/autostart.nix

@@ -0,0 +1,45 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  inherit (lib.modules) mkIf;
+  inherit (lib.options) mkOption;
+  inherit (lib.types) listOf package;
+  cfg = config.autostart;
+
+  # stolen from https://github.com/nix-community/home-manager/issues/3447#issuecomment-1328294558
+  mkAutostartEntries = builtins.listToAttrs (map
+    (pkg: {
+      name = ".config/autostart/" + pkg.pname + ".desktop";
+      value =
+        if pkg ? desktopItem
+        then {
+          # Application has a desktopItem entry.
+          # Assume that it was made with makeDesktopEntry, which exposes a
+          # text attribute with the contents of the .desktop file
+          inherit (pkg.desktopItem) text;
+        }
+        else {
+          # Application does *not* have a desktopItem entry. Try to find a
+          # matching .desktop name in /share/apaplications
+          source = pkg + "/share/applications/" + pkg.pname + ".desktop";
+        };
+    })
+    cfg.programs);
+in {
+  options.autostart = {
+    programs = mkOption {
+      type = listOf package;
+      default = [];
+      description = ''
+        A list of packages that will be started automatically,
+        according to the Desktop Application Autostart
+        Specification.
+      '';
+    };
+  };
+  config = mkIf (cfg.programs != []) {
+    files = mkAutostartEntries;
+  };
+}