Implement method to process updates.

src/telepathy/bot.cr

@@ -8,8 +8,8 @@ module Telepathy
             @this_user = get_me
             @last_update_id = uninitialized Int64?
             @last_update_id = nil
-            @command_hooks = {} of String => Update, Array(String) -> String
+            @command_hooks = {} of String => Update, Array(String) -> Void
-            @message_hooks = [] of Update -> String
+            @message_hooks = [] of Update -> Void
         end
 
         def get_me
@@ -29,11 +29,29 @@ module Telepathy
             return updates
         end
 
-        def command(command_name, &block: Update, Array(String) -> String)
+        def process_updates(updates)
+            updates.each do |update|
+                if message = update.message
+                    @message_hooks.each &.call(update)
+                    if entity = message.entities.try { |it| it.first? }
+                        text = message.text.as String
+                        if entity.offset == 0 && entity.type == "bot_command"
+                            divider_index = (text.index /\s|@/) || text.size
+                            command = text[1...divider_index]
+                            remaining = text[divider_index..text.size]
+                            params = remaining.empty? ? ([] of String) : (remaining[1...remaining.size].split ' ')
+                            @command_hooks[command]?.try { |command| command.call(update, params) }
+                        end
+                    end
+                end
+            end
+        end
+
+        def command(command_name, &block: Update, Array(String) -> Void)
             @command_hooks[command_name] = block
         end
 
-        def message(&block: Update -> String)
+        def message(&block: Update -> Void)
             @message_hooks.push(block)
         end
     end