Class: Module

Inherits:
Object
  • Object
show all
Defined in:
lib/cem/ccommon.rb

Instance Method Summary collapse

Instance Method Details

#append_from(module_to_append_from, *methods_to_keep) ⇒ Object

Append only the given methods from the given mod(ule) Adapted from: www.ruby-forum.com/t/partial-append-features/66728/12 Why? Enumerable has too many methods to include at once.



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# File 'lib/cem/ccommon.rb', line 64

def append_from( module_to_append_from, *methods_to_keep )
  methods_to_keep.map! { |m| m.to_sym }

  methods_to_remove = module_to_append_from.instance_methods(false) - methods_to_keep

  new_mod = Module.new
  new_mod.module_eval do
    include module_to_append_from
    methods_to_remove.each { |meth| undef_method meth }
  end

  # Sanity check:
  check = methods_to_keep - new_mod.instance_methods(true)
  raise "The following methods are not in the given module: #{check.inspect}" if !check.empty?

  include new_mod
end