Implement twitter entities as html links

Frameworks/Account/FeedProvider/Twitter/TwitterHashtag.swift

@@ -18,14 +18,11 @@ struct TwitterHashtag: Codable, TwitterEntity {
 		case indices = "indices"
 	}
 	
-	var startIndex: Int {
-		if let indices = indices, indices.count > 0 {
-			return indices[0] - 1
-		}
-		return 0
-	}
-	
 	func renderAsHTML() -> String {
-		return ""
+		var html = String()
+		if let text = text {
+			html += "<a href=\"https://twitter.com/search?q=%23\(text)\">#\(text)</a>"
+		}
+		return html
 	}
 }

Frameworks/Account/FeedProvider/Twitter/TwitterMention.swift

@@ -13,19 +13,21 @@ struct TwitterMention: Codable, TwitterEntity {
 	let name: String?
 	let indices: [Int]?
 	let screenName: String?
-	let expandedURL: String?
 	let idStr: String?
 	
 	enum CodingKeys: String, CodingKey {
 		case name = "url"
 		case indices = "indices"
 		case screenName = "screen_name"
-		case expandedURL = "expandedURL"
 		case idStr = "idStr"
 	}
 	
 	func renderAsHTML() -> String {
-		return ""
+		var html = String()
+		if let screenName = screenName {
+			html += "<a href=\"https://twitter.com/\(screenName)\">@\(screenName)</a>"
+		}
+		return html
 	}
 	
 }

Frameworks/Account/FeedProvider/Twitter/TwitterStatus.swift

@@ -41,16 +41,6 @@ final class TwitterStatus: Codable {
 		return "\(userURL)/status/\(idStr)"
 	}
 	
-	var displayText: String? {
-		if let text = fullText, let displayRange = displayTextRange, displayRange.count > 1,
-			let startIndex = text.index(text.startIndex, offsetBy: displayRange[0], limitedBy: text.endIndex),
-			let endIndex = text.index(text.startIndex, offsetBy: displayRange[1], limitedBy: text.endIndex) {
-				return String(text[startIndex..<endIndex])
-		} else {
-			return fullText
-		}
-	}
-	
 	func renderAsText() -> String? {
 		let statusToRender = retweetedStatus != nil ? retweetedStatus! : self
 		return statusToRender.displayText
@@ -66,8 +56,54 @@ final class TwitterStatus: Codable {
 		return renderAsOriginalHTML(topLevel: topLevel)
 	}
 	
+}
+
+private extension TwitterStatus {
+	
+	var displayText: String? {
+		if let text = fullText, let displayRange = displayTextRange, displayRange.count > 1,
+			let startIndex = text.index(text.startIndex, offsetBy: displayRange[0], limitedBy: text.endIndex),
+			let endIndex = text.index(text.startIndex, offsetBy: displayRange[1], limitedBy: text.endIndex) {
+				return String(text[startIndex..<endIndex])
+		} else {
+			return fullText
+		}
+	}
+	
+	var displayHTML: String? {
+		if let text = fullText, let displayRange = displayTextRange, displayRange.count > 1,
+			let displayStartIndex = text.index(text.startIndex, offsetBy: displayRange[0], limitedBy: text.endIndex),
+			let displayEndIndex = text.index(text.startIndex, offsetBy: displayRange[1], limitedBy: text.endIndex),
+			let entities = entities?.combineAndSort() {
+			
+			var html = String()
+			var prevIndex = displayStartIndex
+			
+			for entity in entities {
+				if let entityStartIndex = text.index(text.startIndex, offsetBy: entity.startIndex, limitedBy: text.endIndex),
+					let entityEndIndex = text.index(text.startIndex, offsetBy: entity.endIndex, limitedBy: text.endIndex) {
+					
+					if prevIndex < entityStartIndex {
+						html += String(text[prevIndex..<entityStartIndex])
+					}
+					html += entity.renderAsHTML()
+					prevIndex = entityEndIndex
+					
+				}
+			}
+			
+			if prevIndex < displayEndIndex {
+				html += String(text[prevIndex..<displayEndIndex])
+			}
+			
+			return html
+		} else {
+			return displayText
+		}
+	}
+	
 	func renderAsTweetHTML(_ status: TwitterStatus, topLevel: Bool) -> String {
-		var html = "<div>\(status.displayText ?? "")</div>"
+		var html = "<div>\(status.displayHTML ?? "")</div>"
 		
 		if !topLevel, let createdAt = status.createdAt {
 			let dateFormatter = DateFormatter()

Frameworks/Account/FeedProvider/Twitter/TwitterSymbol.swift

@@ -18,15 +18,12 @@ struct TwitterSymbol: Codable, TwitterEntity {
 		case indices = "indices"
 	}
 
-	var startIndex: Int {
-		if let indices = indices, indices.count > 0 {
-			return indices[0] - 1
-		}
-		return 0
-	}
-	
 	func renderAsHTML() -> String {
-		return ""
+		var html = String()
+		if let name = name {
+			html += "<a href=\"https://twitter.com/search?q=%24\(name)\">$\(name)</a>"
+		}
+		return html
 	}
 	
 }

Frameworks/Account/FeedProvider/Twitter/TwitterURL.swift

@@ -18,12 +18,16 @@ struct TwitterURL: Codable, TwitterEntity {
 	enum CodingKeys: String, CodingKey {
 		case url = "url"
 		case indices = "indices"
-		case displayURL = "displayURL"
-		case expandedURL = "expandedURL"
+		case displayURL = "display_url"
+		case expandedURL = "expanded_url"
 	}
 	
 	func renderAsHTML() -> String {
-		return ""
+		var html = String()
+		if let expandedURL = expandedURL, let displayURL = displayURL {
+			html += "<a href=\"\(expandedURL)\">\(displayURL)</a>"
+		}
+		return html
 	}
 	
 }