feat(session): init (#407)

README.md

@@ -43,6 +43,7 @@ At the moment `plasma-manager` supports configuring the following:
 - Screen locker (via the `kscreenlocker` module)
 - Fonts (via the `fonts` module)
 - Window Rules (via the `window-rules` module)
+- Session (via the `session` module)
 - KDE apps (via the `apps` module). In particular the following kde apps have
   modules in `plasma-manager`:
   - ghostwriter

modules/default.nix

@@ -13,6 +13,7 @@
     ./kwin.nix
     ./panels.nix
     ./powerdevil.nix
+    ./session.nix
     ./shortcuts.nix
     ./spectacle.nix
     ./startup.nix

modules/session.nix

@@ -0,0 +1,60 @@
+{ config, lib, ... }:
+let
+  cfg = config.programs.plasma;
+in
+{
+  options.programs.plasma.session = {
+    general = {
+      askForConfirmationOnLogout = lib.mkOption {
+        type = with lib.types; nullOr bool;
+        default = null;
+        example = true;
+        description = "Whether to ask for confirmation when shutting down, restarting or logging out";
+      };
+    };
+    sessionRestore = {
+      restoreOpenApplicationsOnLogin =
+        let
+          options = {
+            onLastLogout = "restorePreviousLogout";
+            whenSessionWasManuallySaved = "restoreSavedSession";
+            startWithEmptySession = "emptySession";
+          };
+        in
+        lib.mkOption {
+          type = with lib.types; nullOr (enum (builtins.attrNames options));
+          default = null;
+          example = "startWithEmptySession";
+          description = ''
+            Controls how applications are restored on login:
+            - "onLastLogout": Restores applications that were open during the last logout.
+            - "whenSessionWasManuallySaved": Restores applications based on a manually saved session.
+            - "startWithEmptySession": Starts with a clean, empty session each time.
+          '';
+          apply = option: if option == null then null else options.${option};
+        };
+      excludeApplications = lib.mkOption {
+        type = with lib.types; nullOr (listOf str);
+        default = null;
+        example = [
+          "firefox"
+          "xterm"
+        ];
+        description = "List of applications to exclude from session restore";
+        apply = apps: if apps == null then null else builtins.concatStringsSep "," apps;
+      };
+    };
+  };
+
+  config.programs.plasma.configFile."ksmserverrc".General = lib.mkMerge [
+    (lib.mkIf (cfg.session.general.askForConfirmationOnLogout != null) {
+      confirmLogout = cfg.session.general.askForConfirmationOnLogout;
+    })
+    (lib.mkIf (cfg.session.sessionRestore.excludeApplications != null) {
+      excludeApps = cfg.session.sessionRestore.excludeApplications;
+    })
+    (lib.mkIf (cfg.session.sessionRestore.restoreOpenApplicationsOnLogin != null) {
+      loginMode = cfg.session.sessionRestore.restoreOpenApplicationsOnLogin;
+    })
+  ];
+}