system/dbus: buffer xdg-dbus-proxy messages

Pointing xdg-dbus-proxy to stdout/stderr makes a huge mess. This change enables app to neatly print out prefixed xdg-dbus-proxy messages after output is resumed.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

internal/app/seal.go

@@ -41,6 +41,8 @@ type appSeal struct {
 	id string
 	// wayland mediation, disabled if nil
 	wl *shim.Wayland
+	// dbus proxy message buffer retriever
+	dbusMsg func(f func(msgbuf []string))
 
 	// freedesktop application ID
 	fid string

internal/app/share.dbus.go

@@ -22,8 +22,10 @@ func (seal *appSeal) shareDBus(config [2]*dbus.Config) error {
 	sessionPath, systemPath := path.Join(seal.share, "bus"), path.Join(seal.share, "system_bus_socket")
 
 	// configure dbus proxy
-	if err := seal.sys.ProxyDBus(config[0], config[1], sessionPath, systemPath); err != nil {
+	if f, err := seal.sys.ProxyDBus(config[0], config[1], sessionPath, systemPath); err != nil {
 		return err
+	} else {
+		seal.dbusMsg = f
 	}
 
 	// share proxy sockets

internal/app/start.go

@@ -185,6 +185,15 @@ func (a *app) Wait() (int, error) {
 	// child process exited, resume output
 	fmsg.Resume()
 
+	// print queued up dbus messages
+	if a.seal.dbusMsg != nil {
+		a.seal.dbusMsg(func(msgbuf []string) {
+			for _, msg := range msgbuf {
+				fmsg.Println(msg)
+			}
+		})
+	}
+
 	// close wayland connection
 	if a.seal.wl != nil {
 		if err := a.seal.wl.Close(); err != nil {