add a new format for video duration

Session/Media Viewing & Editing/MediaInfoVC+MediaInfoView.swift

@@ -184,7 +184,7 @@ extension MediaInfoVC {
             }()
             durationLabel.text = {
                 guard let duration = attachment.duration else { return "N/A" }
-                return floor(duration).formatted(format: .hoursMinutesSeconds)
+                return floor(duration).formatted(format: .videoDuration)
             }()
         }
     }

SessionUtilitiesKit/General/String+Utilities.swift

@@ -84,6 +84,15 @@ public extension String {
         let secondsPerWeek: TimeInterval = (secondsPerDay * 7)
         
         switch format {
+            case .videoDuration:
+                let seconds: Int = Int(duration.truncatingRemainder(dividingBy: 60))
+                let minutes: Int = Int((duration / 60).truncatingRemainder(dividingBy: 60))
+                let hours: Int = Int(duration / 3600)
+                
+                guard hours > 0 else { return String(format: "%02ld:%02ld", minutes, seconds) }
+                
+                return String(format: "%ld:%02ld:%02ld", hours, minutes, seconds)
+            
             case .hoursMinutesSeconds:
                 let seconds: Int = Int(duration.truncatingRemainder(dividingBy: 60))
                 let minutes: Int = Int((duration / 60).truncatingRemainder(dividingBy: 60))

SessionUtilitiesKit/General/TimeInterval+Utilities.swift

@@ -7,6 +7,7 @@ public extension TimeInterval {
         case short
         case long
         case hoursMinutesSeconds
+        case videoDuration
     }
     
     func formatted(format: DurationFormat) -> String {