Adding greetings for Messenger

Sources/SwiftyBot/main.swift

@@ -60,6 +60,26 @@ guard telegramSecret != "" || (messengerSecret != "" && messengerToken != "") el
  throw BotError.missingAppSecrets
 }
 
+// MARK: - Helpers
+
+/// Detector helper struct.
+extension String {
+ /// Detect if the message has greetings.
+ ///
+ /// - Returns: Returns true if the message has greetings, otherwise false.
+ func hasGreetings() -> Bool {
+ let message = self.lowercased()
+ if message.contains("hi") ||
+ message.contains("hello") ||
+ message.contains("hey") ||
+ message.contains("hei") ||
+ message.contains("ciao") {
+ return true
+ }
+ return false
+ }
+}
+
 // MARK: - Telegram bot
 
 /// Setting up the POST request with Telegram secret key.
@@ -335,6 +355,9 @@ droplet.post("messenger", messengerSecret) { request in
  } else if text.isEmpty {
  /// Set the response message text.
  response = Messenger.message("I'm sorry but your message is empty 😢")
+ /// The user greeted the bot.
+ } else if text.hasGreetings() {
+ response = Messenger.message("Hi!\nThis is an example on how to create a bot with Swift.\nIf you want to see more try to send me \"buy\", \"sell\" or \"shop\".")
  /// The user wants to buy something.
  } else if text.lowercased().range(of: "sell") || text.lowercased().range(of: "buy") || text.lowercased().range(of: "shop") {
  do {