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##
# Provides a single method +deprecate+ to be used to declare when
# something is going away.
#
# class Legacy
# def self.klass_method
# # ...
# end
#
# def instance_method
# # ...
# end
#
# extend Deprecate
# deprecate :instance_method, "X.z", 2011, 4
#
# class << self
# extend Deprecate
# deprecate :klass_method, :none, 2011, 4
# end
# end
module Deprecate
def self.skip # :nodoc:
@skip ||= false
end
def self.skip= v # :nodoc:
@skip = v
end
##
# Temporarily turn off warnings. Intended for tests only.
def skip_during
Deprecate.skip, original = true, Deprecate.skip
yield
ensure
Deprecate.skip = original
end
##
# Simple deprecation method that deprecates +name+ by wrapping it up
# in a dummy method. It warns on each call to the dummy method
# telling the user of +repl+ (unless +repl+ is :none) and the
# year/month that it is planned to go away.
def deprecate name, repl, year, month
class_eval {
old = "_deprecated_#{name}"
alias_method old, name
define_method name do |*args, &block| # TODO: really works on 1.8.7?
klass = self.kind_of? Module
target = klass ? "#{self}." : "#{self.class}#"
msg = [ "NOTE: #{target}#{name} is deprecated",
repl == :none ? " with no replacement" : ", use #{repl}",
". It will be removed on or after %4d-%02d-01." % [year, month],
"\n#{target}#{name} called from #{Gem.location_of_caller.join(":")}",
]
warn "#{msg.join}." unless Deprecate.skip
send old, *args, &block
end
}
end
module_function :deprecate, :skip_during
end
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