Class: Tumugi::Registry

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

Constant Summary collapse

DEFAULT_PLUGIN_PATH = 
File.expand_path('plugin', __FILE__)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(kind, search_prefix) ⇒ Registry 



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# File 'lib/tumugi/registry.rb', line 5

def initialize(kind, search_prefix)
  @kind = kind
  @search_prefix = search_prefix
  @map = {}
  @paths = [DEFAULT_PLUGIN_PATH]
end

Instance Attribute Details

#kind ⇒ Object (readonly)

Returns the value of attribute kind.



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# File 'lib/tumugi/registry.rb', line 12

def kind
  @kind
end

#paths ⇒ Object (readonly)

Returns the value of attribute paths.



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# File 'lib/tumugi/registry.rb', line 12

def paths
  @paths
end

Instance Method Details

#lookup(type) ⇒ Object 



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# File 'lib/tumugi/registry.rb', line 19

def lookup(type)
  t = type.to_sym
  return @map[t] if @map.has_key?(t)
  search(type)
  return @map[t] if @map.has_key?(t)
  raise "Unknown #{@kind} plugin '#{type}'"
end

#register(type, value) ⇒ Object 



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# File 'lib/tumugi/registry.rb', line 14

def register(type, value)
  type = type.to_sym
  @map[type] = value
end

#search(type) ⇒ Object 



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# File 'lib/tumugi/registry.rb', line 27

def search(type)
  path = "#{@search_prefix}#{type}"

  # prefer LOAD_PATH than gems
  [@paths, $LOAD_PATH].each do |paths|
    files = paths.map { |lp|
      lpath = File.expand_path(File.join(lp, "#{path}.rb"))
      File.exist?(lpath) ? lpath : nil
    }.compact
    unless files.empty?
      require files.sort.last
      return
    end
  end

  specs = Gem::Specification.find_all { |spec|
    spec.contains_requirable_file? path
  }

  # prefer newer version
  specs = specs.sort_by { |spec| spec.version }
  if spec = specs.last
    spec.require_paths.each do |lib|
      file = "#{spec.full_gem_path}/#{lib}/#{path}"
      return file
    end
  end
end