External files, improve page generation

CHDataManagement/Page Elements/ContentElements/ContentButtons.swift

@@ -0,0 +1,43 @@
+
+struct ContentButtons {
+
+    struct Item {
+
+        let icon: PageIcon
+
+        let filePath: String
+
+        let text: String
+
+        let downloadFileName: String?
+
+        init(icon: PageIcon, filePath: String, text: String, downloadFileName: String? = nil) {
+            self.icon = icon
+            self.filePath = filePath
+            self.text = text
+            self.downloadFileName = downloadFileName
+        }
+    }
+
+    let items: [Item]
+
+    init(items: [Item]) {
+        self.items = items
+    }
+
+    var content: String {
+        var result = "<p class='tags tag-buttons'>"
+        for item in items {
+            addButton(of: item, to: &result)
+        }
+        result += "</p>"
+        return result
+    }
+
+    private func addButton(of item: Item, to result: inout String) {
+        let downloadText = item.downloadFileName.map { " download='\($0)'" } ?? ""
+        result += "<a class='tag' href='\(item.filePath)'\(downloadText)>"
+        result += "<svg><use href='#\(item.icon.name)'></use></svg>\(item.text)"
+        result += "</a>"
+    }
+}