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class Module
# Encapsulates the common pattern of:
#
# alias_method :foo_without_feature, :foo
# alias_method :foo, :foo_with_feature
#
# With this, you simply do:
#
# alias_method_chain :foo, :feature
#
# And both aliases are set up for you.
#
# A punctuation is moved to the end on predicates or bang methods.
#
# alias_method_chain :foo?, :feature
#
# generates "foo_without_feature?" method for old one,
# and expects "foo_with_feature?" method for new one.
def alias_method_chain(target, feature)
punctuation = target.to_s.scan(/[?!]/).first
aliased_target = target.to_s.sub(/[?!]/, '')
alias_method "#{aliased_target}_without_#{feature}#{punctuation}", target
alias_method target, "#{aliased_target}_with_#{feature}#{punctuation}"
end
end
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