Windows must be manually managed through the WaitFor function

Closes #5

application.go

@@ -15,9 +15,8 @@ type Application interface {
 	// Describe returns a description of the application.
 	Describe () ApplicationDescription
 
-	// Init performs the initial setup of the application. This behavior
-	// should return a window if it creates one.
-	Init () (tomo.Window, error)
+	// Init performs the initial setup of the application.
+	Init () (error)
 
 	// Stop stops the application and does not return until all ongoing
 	// operations have been completely shut down.
@@ -34,15 +33,11 @@ type ApplicationURLOpener interface {
 	//
 	// Applications should support the file:// scheme at the very least, and
 	// should also support others like http:// and https:// if possible.
-	//
-	// This behavior should return a window if it creates one.
-	OpenURL (*url.URL) (tomo.Window, error)
+	OpenURL (*url.URL) error
 
 	// OpenNone is called when the application is launched without any URLs
-	// to open. The application may create some sort of default starting
-	// window, or do nothing. This behavior should return a window if it
-	// creates one.
-	OpenNone () (tomo.Window, error)
+	// to open.
+	OpenNone () error
 }
 
 // ApplicationFlagAdder is an application that supports reading command line
@@ -156,18 +151,18 @@ func RunApplication (application Application) {
 	if err != nil { log.Fatalln("nasin: could not set icon set:", err) }
 	err = reg.SetFaceSet()
 	if err != nil { log.Fatalln("nasin: could not set face set:", err) }
-	window, err := application.Init()
+	err = application.Init()
 	if err != nil { log.Fatalln("nasin: could not run application:", err) }
-	manageWindow(window)
 
 	// open URLs
 	args := flag.Args()
 	applicationOpenUrls(application, args...)
 
-	if windows > 0 {
+	if manager.count > 0 {
 		err = backend.Run()
 		if err != nil { log.Fatalln("nasin: could not run application:", err) }
 	}
+	application.Stop()
 }
 
 // NewApplicationWindow creates a window for an application. It will
@@ -185,19 +180,6 @@ func NewApplicationWindow (application Application, bounds image.Rectangle) (tom
 	return window, nil
 }
 
-var windows int
-
-func manageWindow (window tomo.Window) {
-	if window == nil { return }
-	windows ++
-	window.OnClose(func () {
-		windows --
-		if windows < 1 {
-			tomo.Stop()
-		}
-	})
-}
-
 func errorPopupf (title, format string, v ...any) func (func ()) {
 	return func (callback func ()) {
 		dialog, err := objects.NewDialogOk (
@@ -207,7 +189,7 @@ func errorPopupf (title, format string, v ...any) func (func ()) {
 			callback)
 		if err != nil { log.Fatal(err) }
 		dialog.SetVisible(true)
-		manageWindow(dialog)
+		WaitFor(dialog)
 	}
 }
 
@@ -221,12 +203,11 @@ func applicationOpenUrls (app Application, args ...string) {
 	}
 	
 	openNone := func () bool {
-		window, err := application.OpenNone()
+		err := application.OpenNone()
 		if err != nil {
 			log.Fatalf("nasin: could not open main window: %v", err)
 			return false
 		}
-		manageWindow(window)
 		return true
 	}
 	
@@ -246,7 +227,7 @@ func applicationOpenUrls (app Application, args ...string) {
 		if ur.Scheme == "" {
 			ur.Scheme = "file"
 		}
-		window, err := application.OpenURL(ur)
+		err = application.OpenURL(ur)
 		if err != nil {
 			errorPopupf(
 				"Could Not Open URL",
@@ -258,7 +239,6 @@ func applicationOpenUrls (app Application, args ...string) {
 				}
 			})
 		}
-		manageWindow(window)
 	}
 }
 

manager.go

@@ -0,0 +1,33 @@
+package nasin
+
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/event"
+
+var manager struct {
+	count int
+}
+
+type funcCookie func ()
+func (cookie funcCookie) Close () {
+	cookie()
+}
+
+// WaitFor ensures that the application will stay running while the given window
+// is open.
+func WaitFor (window tomo.Window) event.Cookie {
+	manager.count ++
+	
+	isManaged := true
+	handleClose := func () {
+		if !isManaged { return }
+		isManaged = false
+		manager.count --
+		if manager.count < 1 {
+			tomo.Stop()
+		}
+	}
+
+	return event.MultiCookie (
+		window.OnClose(handleClose),
+		funcCookie(handleClose))
+}