Add audio attributes for doument preview

Author: 1024jp

CotEditor/Sources/Document Window/Content View/FilePreviewView.swift

@@ -77,6 +77,8 @@ struct FilePreviewView: View {
                         ImageAttributesView(attributes: attributes)
                     case let attributes as MovieAttributes:
                         MovieAttributesView(attributes: attributes)
+                    case let attributes as AudioAttributes:
+                        AudioAttributesView(attributes: attributes)
                     default:
                         EmptyView()
                 }
@@ -165,6 +167,20 @@ struct MovieAttributesView: View {
 }
 
 
+struct AudioAttributesView: View {
+    
+    var attributes: AudioAttributes
+    
+    
+    var body: some View {
+        
+        LabeledContent(String(localized: "Duration", table: "Document"),
+                       value: self.attributes.duration,
+                       format: .time(pattern: self.attributes.duration.naturalPattern))
+    }
+}
+
+
 private extension CGSize {
 
     /// The human-readable representation.

CotEditor/Sources/Document/PreviewDocument.swift

@@ -79,6 +79,15 @@ protocol FileContentAttributes: Sendable, Equatable { }
                         self.contentAttributes = attributes
                     }
                 }
+                
+            } else if type.conforms(to: .audio) {
+                Task {
+                    let attributes = try await AVAsset(url: url).audioAttributes
+                    
+                    await MainActor.run {
+                        self.contentAttributes = attributes
+                    }
+                }
             }
         }
 

CotEditor/Sources/Models/File Attributes/AudioAttributes.swift

@@ -0,0 +1,44 @@
+//
+//  AudioAttributes.swift
+//
+//  CotEditor
+//  https://coteditor.com
+//
+//  Created by 1024jp on 2025-05-19.
+//
+//  ---------------------------------------------------------------------------
+//
+//  © 2025 1024jp
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  https://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+import AVFoundation
+
+struct AudioAttributes: FileContentAttributes {
+    
+    var duration: Duration
+}
+
+
+extension AVAsset {
+    
+    final var audioAttributes: AudioAttributes {
+        
+        get async throws {
+            try await AudioAttributes(
+                duration: .seconds(self.load(.duration).seconds)
+            )
+        }
+    }
+}