refactor and cleanup [skip ci]

submodules/Postbox/Sources/MediaResourceStatus.swift

@@ -0,0 +1,34 @@
+import Foundation
+import SwiftSignalKit
+
+public enum MediaResourceStatus: Equatable {
+    case Remote
+    case Local
+    case Fetching(isActive: Bool, progress: Float)
+}
+
+public func ==(lhs: MediaResourceStatus, rhs: MediaResourceStatus) -> Bool {
+    switch lhs {
+        case .Remote:
+            switch rhs {
+                case .Remote:
+                    return true
+                default:
+                    return false
+            }
+        case .Local:
+            switch rhs {
+                case .Local:
+                    return true
+                default:
+                    return false
+            }
+        case let .Fetching(lhsIsActive, lhsProgress):
+            switch rhs {
+                case let .Fetching(rhsIsActive, rhsProgress):
+                    return lhsIsActive == rhsIsActive && lhsProgress.isEqual(to: rhsProgress)
+                default:
+                    return false
+            }
+    }
+}