Module: Kontena::Command::Finalizer

Defined in:
lib/kontena/command.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(obj) ⇒ Object 



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# File 'lib/kontena/command.rb', line 19

def self.extended(obj)
  # Tracepoint is used to trigger finalize once the command is completely
  # loaded. If done through def self.inherited the finalizer and
  # after_load callbacks would run before the options are defined.
  TracePoint.trace(:end) do |t|
    if obj == t.self
      obj.finalize
      t.disable
    end
  end
end

Instance Method Details

#finalize ⇒ Object 



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# File 'lib/kontena/command.rb', line 31

def finalize
  return if self.has_subcommands?
  return if self.callback_matcher

  name_parts = self.name.split('::')[-2, 2]

  unless name_parts.compact.empty?
    # 1: Remove trailing 'Command' from for example AuthCommand
    # 2: Convert the string from CamelCase to under_score
    # 3: Convert the string into a symbol
    #
    # In comes: ['ExternalRegistry', 'UseCommand']
    # Out goes: [:external_registry, :use]
    name_parts = name_parts.map { |np|
      np.gsub(/Command$/, '').
      gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
      gsub(/([a-z\d])([A-Z])/,'\1_\2').
      tr("-", "_").
      downcase.
      to_sym
    }
    self.callback_matcher(*name_parts)
  end

  # Run all #after_load callbacks for this command.
  [name_parts.last, :all].compact.uniq.each do |cmd_type|
    [name_parts.first, :all].compact.uniq.each do |cmd_class|
      if Kontena::Callback.callbacks.fetch(cmd_class, {}).fetch(cmd_type, nil)
        Kontena::Callback.callbacks[cmd_class][cmd_type].each do |cb|
          if cb.instance_methods.include?(:after_load)
            cb.new(self).after_load
          end
        end
      end
    end
  end
end