app: move wayland mediation to shim package

Values used in the Wayland mediation implementation is stored in various struct fields strewn across multiple app structs and checks are messy and confusing. This commit unifies them into a single struct and access it using much better looking methods.

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

internal/app/share.display.go

@@ -34,7 +34,7 @@ func (seal *appSeal) shareDisplay() error {
 		if wd, ok := os.LookupEnv(waylandDisplay); !ok {
 			return fmsg.WrapError(ErrWayland,
 				"WAYLAND_DISPLAY is not set")
-		} else if seal.wlDone == nil {
+		} else if seal.wl == nil {
 			// hardlink wayland socket
 			wp := path.Join(seal.RuntimePath, wd)
 			wpi := path.Join(seal.shareLocal, "wayland")
@@ -46,8 +46,8 @@ func (seal *appSeal) shareDisplay() error {
 			// ensure Wayland socket ACL (e.g. `/run/user/%d/wayland-%d`)
 			seal.sys.UpdatePermType(system.EWayland, wp, acl.Read, acl.Write, acl.Execute)
 		} else {
-			// set wayland socket path (e.g. `/run/user/%d/wayland-%d`)
-			seal.wl = path.Join(seal.RuntimePath, wd)
+			// set wayland socket path for mediation (e.g. `/run/user/%d/wayland-%d`)
+			seal.wl.Path = path.Join(seal.RuntimePath, wd)
 		}
 	}