Class: DependencyResolver

Inherits:
Object show all
Defined in:
lib/rucola/dependencies/resolver.rb

Overview

:nodoc:

Defined Under Namespace

Classes: UnableToResolveError

Instance Method Summary collapse

Constructor Details

#initialize(name, version) ⇒ DependencyResolver

Returns a new instance of DependencyResolver.



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# File 'lib/rucola/dependencies/resolver.rb', line 10

def initialize(name, version)
  @name, @version = name, version
end

Instance Method Details

#difference_in_loaded_features ⇒ Object 



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# File 'lib/rucola/dependencies/resolver.rb', line 36

def difference_in_loaded_features
  # save this to set it back to what it originally was
  loaded_features_before_rubygems = $LOADED_FEATURES.dup
  
  $LOADED_FEATURES.replace([])
  require 'rubygems' rescue LoadError
  
  Kernel.module_eval do
    alias_method :__require_before_dependency_resolver, :require
    def require(name)
      unless Rucola::Dependencies.exclude?(name)
        __require_before_dependency_resolver(name)
      end
    end
  end
  
  # save this so we can compare what else was added except for rubygems
  loaded_features_before = $LOADED_FEATURES.dup
  
  require!
  
  result = ($LOADED_FEATURES - loaded_features_before)
  $LOADED_FEATURES.replace(loaded_features_before_rubygems)
  result
end

#require! ⇒ Object 



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# File 'lib/rucola/dependencies/resolver.rb', line 14

def require!
  verbose_before = $VERBOSE
  $VERBOSE = nil
  begin
    if Kernel.private_methods.include? 'gem_original_require'
      gem_original_require(@name)
    else
      require(@name)
    end
  rescue LoadError
    # unfortunately, rubygems will always require 'etc.bundle' & 'fileutils' so there's no real way of knowing
    # wether or not it was required by rubygems or the actual library.
    begin
      Gem.activate(@name, true, @version)
      require(@name)
    rescue NameError
      raise UnableToResolveError, "Unable to resolve: '#{@name}', '#{@version}'"
    end
  end
  $VERBOSE = verbose_before
end