nixos/programs/sessiond: add session example

modules/nixos/programs/sessiond/default.nix

@@ -89,6 +89,84 @@ in
         };
         modules = [ ./submodules/session-type.nix ];
       });
+      example = lib.literalExpression ''
+        {
+          "com.example.Beepeedobolyuessemm" = {
+            description = "Simple desktop environment featuring bspwm";
+            desktopNames = [ "Beepeedobolyuessemm" ];
+
+            settings = {
+              Idle = {
+                Inputs = [ "motion" "button-press" "key-press" ];
+                IdleSec = 120;
+              };
+
+              Lock = {
+                OnIdle = true;
+                OnSleep = true;
+                MuteAudio = true;
+              };
+
+              Hook = [
+                {
+                  Trigger = "Idle";
+                  ExecStart = "''${lib.getExe' pkgs.betterlockscreen "betterlockscreen"} --off 240";
+                }
+              ];
+            };
+
+            components = {
+              window-manager = {
+                description = "Window manager";
+
+                serviceUnit = {
+                  # This is required for sessiond to recognize which unit is the
+                  # window manager.
+                  aliases = [ "window-manager.service" ];
+
+                  script = '''
+                    ''${lib.getExe' pkgs.bspwm "bspwm"} -c ''${./config/bspwm/bspwmrc}
+                  ''';
+
+                  serviceConfig = {
+                    ExecStopPost = "''${lib.getExe' sessiondPkg "sessionctl"} stop";
+                    OOMScoreAdjust = -1000;
+                  };
+                };
+
+                targetUnit = {
+                  requires = [ "sessiond-session.target" ];
+                  partOf = [ "sessiond-session.target" ];
+                  wantedBy = [ "sessiond-session.target" ];
+                };
+              };
+
+              hotkey-daemon = {
+                description = "Hotkey daemon";
+
+                serviceUnit = {
+                  documentation = [ "man:sxhkd(1)" ];
+
+                  script = '''
+                    ''${lib.getExe' pkgs.sxhkd "sxhkd"} -c ''${./config/sxhkd/bindings}
+                  ''';
+
+                  serviceConfig = {
+                    ExecReload = "''${lib.getExe' pkgs.coreutils "kill"} -SIGUSR1 $MAINPID";
+                    ExecStopPost = "''${lib.getExe' sessiondPkg "sessionctl"} stop";
+                    OOMScoreAdjust = -1000;
+                  };
+                };
+
+                targetUnit = {
+                  after = [ "display-manager.service" ];
+                  partOf = [ "sessiond-session.target" ];
+                };
+              };
+            };
+          };
+        }
+      '';
       description = ''
         A set of desktop sessions to be configured with sessiond. Each of the
         attribute name will be used as the identifier of the desktop
@@ -117,8 +195,8 @@ in
     systemd.packages = [ cfg.package ];
     systemd.user.units = lib.mkMerge sessionSystemdUnits;
 
-    # We're disabling the upstream sessiond service since there can be multiple
+    # We're disabling the upstream sessiond service since we have our own set
-    # sessiond sessions here.
+    # of sessiond sessions here.
     systemd.user.services.sessiond.enable = false;
   };
 }