Migration Guide

This document explains how to migrate between API incompatible versions of Cakewalk.

Migrating from 1.x to 2.x

Plugins

New methods

Plugins have the following (new) instance and class methods, which you shouldn’t and usually mustn’t overwrite:

• #bot
• #config
• #handlers
• #synchronize
• #timers
• #unregister
• ::call_hooks
• ::check_for_missing_options
• ::ctcp
• ::ctcps
• ::help=
• ::help
• ::hook
• ::hooks
• ::listen_to
• ::listeners
• ::match
• ::matchers
• ::plugin_name=
• ::plugin_name
• ::prefix=
• ::prefix
• ::react_on=
• ::react_on
• ::required_options=
• ::required_options
• ::set
• ::suffix=
• ::suffix
• ::timer
• ::timers

Note: The list does also include methods from prior versions.

Plugin options

Previously, plugins used a DSL-like way of setting options like the plugin prefix. This contradicts with the general idea of plugins being ordinary Ruby classes and also caused a lot of code and documentation smell.

Instead of having methods like #prefix double as both attribute getter and setter, options can now be set in two different ways: Using ordinary attribute setters or using the #set method.

Cakewalk 1.x

class MyPlugin
  include Cakewalk::Plugin

  prefix /^!/
  help "some help message"
  match /foo/
  def execute(m)
    # ...
  end
end

Cakewalk 2.x, attribute setters

class MyPlugin
  include Cakewalk::Plugin

  self.prefix = /^!/
  self.help   = "some help message"
  match /foo/
  def execute(m)
    # ...
  end
end

Cakewalk 2.x, #set method

class MyPlugin
  include Cakewalk::Plugin

  set :prefix, /^!/
  set :help,   "some help message"
  match /foo/
  def execute(m)
    # ...
  end
end

Cakewalk 2.x, #set method, alternative syntax

class MyPlugin
  include Cakewalk::Plugin

  set prefix: /^!/,
      help:   "some help message"
  match /foo/
  def execute(m)
    # ...
  end
end

No more automatic matcher with the plugin’s name

Cakewalk does not add a default matcher with the plugin’s name anymore. If you’ve been relying on the following to work

class Footastic
  include Cakewalk::Plugin

  def execute(m)
    # this will triger on "!footastic"
  end
end

you will have to rewrite it using an explicit matcher:

class Footastic
  include Cakewalk::Plugin

  match "footastic"
  def execute(m)
    # ...
  end
end

No more default #execute and #listen methods

Plugins do not come with default #execute and #listen methods anymore, which means that specifying a matcher or listener without providing the required methods will always result in an exception.

Programmatically registering plugins

If you’re using the API to register plugins on your own, you will have to use the new Cakewalk::PluginList class and its methods, instead of using Cakewalk::Bot#register_plugin or Cakewalk::Bot#register_plugins, which have been removed.

The PluginList instance is available via Cakewalk::Bot#plugins.

Logging

Logging in Cakewalk 2.x has been greatly improved. Instead of only supporting one logger and having all logging-relevant methods in Cakewalk::Bot, we’ve introduced the Cakewalk::LoggerList class, which manages an infinite number of loggers. Included with Cakewalk are the formatted logger, known from Cakewalk 1.x, and a new Zcbot logger, a logger emulating the log output of Zcbot, a format which can be parsed by pisg.

Log levels

The old @config.verbose option has been replaced with a finely tunable log level system. Each logger has its own level, but it is also possible to set the level for all loggers at once.

The available levels, in ascending order of verbosity, are:

• fatal
• error
• warn
• info
• log
• debug

Methods

All logging related methods (Cakewalk::Bot#debug et al) have been removed from the Bot class and instead moved to the loggers and the LoggerList. If you want to log messages from your plugins or handlers, you should use Cakewalk::Bot#loggers to access the LoggerList and then call the right methods on that. Alterntively you can also use the logging-related helper methods provided by Cakewalk::Helpers.

For more information on the logging architecture as well as examples on how to use it, check the Logging readme.

Prefix/suffix + string semantics

Behaviour of string prefixes and suffixes has been adapted to match that of matchers.

That means that if the prefix or suffix are strings, the ^ or $ anchor will be prepended/appened.

Hooks and their return value

Hooks now behave as filters. If a hook returns false, the message will not further be processed in a particular plugin.

Constants

All constants for numeric replies (e.g. RPL_INFO) have been moved from Cakewalk to Cakewalk::Constants. Thus Cakewalk::RPL_INFO becomes Cakewalk::Constants::RPL_INFO, same for all other numeric constants.

Bot configuration

Bot configuration now uses special classes instead of OpenStructs. Thus, assignments like

configure do |c|
  c.timeouts = OpenStruct.new({:read => 240, :connect => 10})
end

are not possible anymore and have to be written as either

configure do |c|
  c.timeouts.read    = 240
  c.timeouts.connect = 10
end

or

configure do |c|
  c.timeouts.load({:read => 240, :connect => 10})
end

The second version is especially interesting to tools like Cakewalkize, which load the configuration from a YAML file. For more information see Bot options.

Various removed methods

See What’s changed

on-handlers now only accepts one pattern

In previous versions, Cakewalk::Bot#on accepted a variable amount of patterns to match against. This feature was rarely used and has hence been removed. If you’ve been using constructs like

on :message, [/this/, /that/] do |m|
  # ...
end

you will have to rewrite them as follows:

b = lambda { |m|
  # ...
}

[/this/, /that/].each do |pattern|
  on :message, pattern, &b
end