Use bang-methods as actions for commands

lib/telegram/bot/updates_controller/commands.rb

@@ -0,0 +1,44 @@
+module Telegram
+  module Bot
+    class UpdatesController
+      #  Support for parsing commands
+      module Commands
+        CMD_REGEX = %r{\A/([a-z\d_]{,31})(@(\S+))?(\s|$)}i
+
+        class << self
+          # Fetches command from text message. All subsequent words are returned
+          # as arguments.
+          # If command has mention (eg. `/test@SomeBot`), it returns commands only
+          # for specified username. Set `username` to `true` to accept
+          # any commands.
+          def command_from_text(text, username = nil)
+            return unless text
+            match = text.match(CMD_REGEX)
+            return unless match
+            mention = match[3]
+            [match[1], text.split.drop(1)] if username == true || !mention || mention == username
+          end
+        end
+
+        # Override it to filter or transform commands.
+        # Default implementation is to downcase and add `!` suffix.
+        def action_for_command(cmd)
+          "#{cmd.downcase}!"
+        end
+
+        # If payload is a message with command, then returned action is an
+        # action for this command.
+        # Separate method, so it can be easily overriden (ex. MessageContext).
+        #
+        # This is not used for edited messages/posts. It process them as basic updates.
+        def action_for_message
+          cmd, args = Commands.command_from_text(payload['text'], bot_username)
+          return unless cmd
+          [[action_for_command(cmd), type: :command, command: cmd], args]
+        end
+
+        alias_method :action_for_channel_post, :action_for_message
+      end
+    end
+  end
+end