On Tue, 13 Dec 2005, Jeremy Kemper wrote:
I'd like a Module#wrap_method in Active Support to DRY up the repetitive,
error-prone aliasing and give us a single place to more thoroughly check for
double-wrapping.
[EMAIL PROTECTED] ~]$ cat a.rb
require "tsort"
class TSortHash < ::Hash
include TSort
def tsort_each_node *a, &b
each_key *a, &b
end
def tsort_each_child *a, &b
(self[a.shift] || []).each &b
end
end
class Module
unless @__alias_method_redfined__
alias_method "__alias_method__", "alias_method" # yikes!
def alias_method dst, src
dst, src = dst.to_s, src.to_s
begin
(@__aliased_methods__ ||= TSortHash::new).update(dst => [src]).tsort
rescue TSort::Cyclic => e
raise "circular definition of <#{ dst }> => <#{ src }>!"
end
__alias_method__ dst, src
end
@__alias_method_redfined__ = true
end
end
module Kernel
alias_method "foo", "puts"
alias_method "bar", "foo"
end
bar 42
module Kernel
alias_method "puts", "bar"
end
[EMAIL PROTECTED] ~]$ ruby a.rb
42
a.rb:21:in `alias_method': circular definition of <puts> => <bar>!
(RuntimeError)
from a.rb:37
testers on different boxen? feedback?
-a
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