Rework content commands, add audio player

CHDataManagement/Model/Page.swift

@@ -1,8 +1,6 @@
 import Foundation
 
-final class Page: ObservableObject {
-
-    unowned let content: Content
+final class Page: Item {
 
     /**
      The unique id of the entry
@@ -10,6 +8,15 @@ final class Page: ObservableObject {
     @Published
     var id: String
 
+    /**
+     The external link this page points to.
+
+     If this value is not `nil`, then the page has no content
+     and many other features are disabled.
+     */
+    @Published
+    var externalLink: String?
+
     @Published
     var isDraft: Bool
 
@@ -44,6 +51,7 @@ final class Page: ObservableObject {
 
     init(content: Content,
          id: String,
+         externalLink: String?,
          isDraft: Bool,
          createdDate: Date,
          startDate: Date,
@@ -51,8 +59,8 @@ final class Page: ObservableObject {
          german: LocalizedPage,
          english: LocalizedPage,
          tags: [Tag]) {
-        self.content = content
         self.id = id
+        self.externalLink = externalLink
         self.isDraft = isDraft
         self.createdDate = createdDate
         self.startDate = startDate
@@ -61,6 +69,8 @@ final class Page: ObservableObject {
         self.german = german
         self.english = english
         self.tags = tags
+
+        super.init(content: content)
     }
 
     func localized(in language: ContentLanguage) -> LocalizedPage {
@@ -78,6 +88,28 @@ final class Page: ObservableObject {
         id = newId
         return true
     }
+
+    var isExternalUrl: Bool {
+        externalLink != nil
+    }
+
+    // MARK: Paths
+
+    func absoluteUrl(for language: ContentLanguage) -> String {
+        if let url = externalLink {
+            return url
+        }
+        // TODO: Record link to trace connections between pages
+        return makeCleanAbsolutePath(internalPath(for: language))
+    }
+
+    func filePathRelativeToOutputFolder(for language: ContentLanguage) -> String {
+        makeCleanRelativePath(internalPath(for: language))
+    }
+
+    private func internalPath(for language: ContentLanguage) -> String {
+        content.settings.pages.pageUrlPrefix + "/" + localized(in: language).urlString
+    }
 }
 
 extension Page: Identifiable {