Class: Shelley::CommandRegistry

Inherits:
Object
  • Object
show all
Defined in:
lib/shelley/registry.rb

Overview

A shell

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CommandRegistry

Returns a new instance of CommandRegistry.



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# File 'lib/shelley/registry.rb', line 69

def initialize
  @tree = CommandNode.new
end

Instance Method Details

#add_command(instance, *path) ⇒ Object

Adds a command to the shell



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# File 'lib/shelley/registry.rb', line 83

def add_command(instance, *path)
  node = @tree.ensure_exists(*path)
  instance.class.public_instance_methods(false).each do |method_name|
    child = node.ensure_exists(method_name.to_s)
    child.command = Command.new(instance.method(method_name))
  end
end

#command?(*path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shelley/registry.rb', line 78

def command?(*path)
  !@tree.node_by_path(*path).nil?
end

#commands_tree ⇒ Object

Returns the command tree



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# File 'lib/shelley/registry.rb', line 74

def commands_tree
  @tree
end

#execute_command(command) ⇒ Object

Executes a command



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# File 'lib/shelley/registry.rb', line 96

def execute_command(command)
  tokens = command.split
  node = @tree
  until tokens.count.zero?
    prev_node = node
    curr_name = tokens.shift
    node = node.node_by_path(curr_name)
    if node.nil?
      raise_error(command) if prev_node.command.nil?
      tokens.insert(0, curr_name)
      prev_node.command.execute(*tokens)
      return
    elsif tokens.count.zero?
      node.command.execute
      return
    end
  end
  raise_error(command)
end

#raise_error(command) ⇒ Object

Raises:



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# File 'lib/shelley/registry.rb', line 91

def raise_error(command)
  raise CommandError, "Cannot find command \"#{command}\""
end