Module: Kernel

Defined in:
lib/active_support/core_ext/kernel.rb

Instance Method Summary collapse

Instance Method Details

#require_library_or_gem(library_name) ⇒ Object

Method that requires a library, ensuring that rubygems is loaded



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# File 'lib/active_support/core_ext/kernel.rb', line 33

def require_library_or_gem(library_name)
  begin
    require library_name
  rescue LoadError => cannot_require
    # 1. Requiring the module is unsuccessful, maybe it's a gem and nobody required rubygems yet. Try.
    begin
      require 'rubygems'
    rescue LoadError => rubygems_not_installed
      raise cannot_require
    end
    # 2. Rubygems is installed and loaded. Try to load the library again
    begin
      require library_name
    rescue LoadError => gem_not_installed
      raise cannot_require
    end
  end
end

#returning(value) ⇒ Object

A Ruby-ized realization of the K combinator, courtesy of Mikael Brockman.

def foo
  returning values = [] do
    values << 'bar'
    values << 'baz'
  end
end

foo # => ['bar', 'baz']



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# File 'lib/active_support/core_ext/kernel.rb', line 13

def returning(value)
  yield
  value
end

#silence_warnings ⇒ Object

Sets $VERBOSE to nil for the duration of the block and back to its original value afterwards.

silence_warnings do
  value = noisy_call # no warning voiced
end

noisy_call # warning voiced



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# File 'lib/active_support/core_ext/kernel.rb', line 25

def silence_warnings
  old_verbose, $VERBOSE = $VERBOSE, nil
  yield
ensure
  $VERBOSE = old_verbose
end