Class: Butler::Plugins

Inherits:
Object
  • Object
show all
Includes:
Enumerable, Log::Comfort
Defined in:
lib/butler/plugins.rb

Overview

Plugins manages the plugins in Butler It uses

Constant Summary collapse

Suffix = 
".rb"

Instance Attribute Summary collapse

Attributes included from Log::Comfort

#logger

Instance Method Summary collapse

Methods included from Log::Comfort

#debug, #error, #exception, #fail, #info, #log, #warn

Methods included from Enumerable

#join

Constructor Details

#initialize(butler, plugin_dir) ⇒ Plugins

Returns a new instance of Plugins.

Raises:

  • (ArgumentError) 


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# File 'lib/butler/plugins.rb', line 29

def initialize(butler, plugin_dir)
	@dir       = File.expand_path(plugin_dir).freeze
	raise ArgumentError, "#{@dir} is not a directory" unless File.directory?(@dir)
	@plugins   = {}
	@constants = {}
	@butler    = butler
	@logger    = butler.logger
end

Instance Attribute Details

#dir ⇒ Object (readonly)

Returns the value of attribute dir.



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# File 'lib/butler/plugins.rb', line 28

def dir
  @dir
end

Instance Method Details

#[](base) ⇒ Object 



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# File 'lib/butler/plugins.rb', line 73

def [](base)
	@plugins[base]
end

#active ⇒ Object

returns a list with the names of active plugins



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# File 'lib/butler/plugins.rb', line 61

def active
	@plugins.keys
end

#all ⇒ Object

returns a list with the bases of all plugins



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# File 'lib/butler/plugins.rb', line 53

def all
	slice = @dir.length+1..-(Suffix.length+1)
	Dir["#{@dir}/**/*#{Suffix}"].select { |file| File.file?(file) }.map { |file|
		file[slice]
	}
end

#groups ⇒ Object

returns a list with first-level groups



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# File 'lib/butler/plugins.rb', line 39

def groups
	slice = @dir.length+1..-1
	Dir[@dir+"/*"].reject { |file|
		File.extname(file).downcase == Suffix
	}.map { |file|
		file[slice]
	}
end

#identify(name) ⇒ Object 



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# File 'lib/butler/plugins.rb', line 77

def identify(name)
	plugin = Dir["#{@dir}/**/#{name}#{Suffix}"].first
	plugin && plugin[@dir.length+1..-(Suffix.length+1)]
end

#inactive ⇒ Object 



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# File 'lib/butler/plugins.rb', line 65

def inactive
	all-active
end

#instances ⇒ Object 



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# File 'lib/butler/plugins.rb', line 48

def instances
	@plugins.values
end

#load(base) ⇒ Object Also known as: reload 



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# File 'lib/butler/plugins.rb', line 95

def load(base)
	path     = "#{@dir}/#{base.downcase}#{Suffix}"
	name     = File.basename(base).camelcase
	codefile = path

	unless File.file?(codefile) then
		raise ArgumentError, "Invalid plugin '#{base}' (codefile: #{codefile})."
	end
	begin
		unload(base) if loaded?(base) # a plugin may not be loaded twice
	rescue Exception => e
		exception(e)
	end
	begin
		constant = "%s_%08X" %  [name, rand(0xffffffff)]
	end while Butler::Plugins.const_defined?(constant)
	plugin = Butler::Plugins.const_set(constant, Class.new(Plugin))
	plugin.logger = @butler.logger
	begin
		plugin.load_plugin(@butler, base, path)
		plugin.class_eval(File.read(codefile), codefile)
		plugin.on_load
	rescue Exception => e
		e.extend Exception::Detailed
		e.prepend "Loading plugin #{base} failed."
		exception(e)
	end
	@constants[base] = constant.freeze
	@plugins[base]   = plugin
end

#load_all ⇒ Object 



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# File 'lib/butler/plugins.rb', line 82

def load_all
	all.each { |base|
		load(base)
	}
end

#load_group(group) ⇒ Object 



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# File 'lib/butler/plugins.rb', line 88

def load_group(group)
	slice = @dir.length+1..-(Suffix.length+1)
	Dir["#{@dir}/#{group}/**/*#{Suffix}"].select { |file| File.file?(file) }.each { |file|
		load(file[slice])
	}
end

#loaded?(base) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/butler/plugins.rb', line 69

def loaded?(base)
	@plugins.has_key?(base)
end

#unload(base) ⇒ Object 



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# File 'lib/butler/plugins.rb', line 127

def unload(base)
	begin
		@plugins[base].on_unload
		@plugins[base].unload_plugin
	rescue Exception => e
		e.extend Exception::Detailed
		e.prepend "Exception raised while unloading plugin #{base}."
		exception(e)
	end
	Butler::Plugins.send(:remove_const, @constants[base])
	@plugins.delete(base)
	@constants.delete(base)
	true
end