How to overide "include" method?

[Alexandre Mutel]

I tried several way, but didn't found any to override the behavior of
the "include" method.
I would like to override it's behavior to accept a string as an argument
and perform a special include based on that.. so I tried something like
this:

class Module
def include(module1, *smth) # :doc:
puts "In my include #{self}"
if ( module1.is_a? String)
instance_eval(File.read(module1), module1)
else
super module1,*smth
end
end
end

without any success, this method is nether called.

Any ideas?

 

[Phrogz]

I tried several way, but didn't found any to override the behavior of
the "include" method.

# Class methods of classes inherit from instance methods of
# the Class class before they inherit from instance methods of Module.
# http://phrogz.net/RubyLibs/RubyMethodLookupFlow.png
class Class
def include(*args)
p "hi!"
super
end
end

module Bar; end

class Foo
include Bar #=> "hi!"
end

p Foo.ancestors
#=> [Foo, Bar, Object, Kernel]

 

[Alexandre Mutel]

# Class methods of classes inherit from instance methods of
# the Class class before they inherit from instance methods of Module.
# http://phrogz.net/RubyLibs/RubyMethodLookupFlow.png

Thanks! Your example is working well until i use it inside a class
definition.

But when i'm trying to use it from the irb prompt, but the overloaded
include it's not called...
Is there a way to found from where the method is define? ( with
methodinclude).something?), so i know where to define the overload...

For example, if i put the class overloading in a separate file
class_includer.rb
class Class
def include(*args)
p "hi!"
super
end
end

And from the irb :
require "class_includer"
include "test"

The method above is not called. It means that it's implemented elsewhere
in this case (outside a class definition, in the top level).

I tried to overload directly the include method in the irb, but it's not
working as well, very strange... well, i have probably to understand
more how scope on self is working!

So from the top level, where i can overload this "include" method?

 

[Phrogz]

Gavin Kistner wrote:
But when i'm trying to use it from the irb prompt, but the overloaded
include it's not called...
Is there a way to found from where the method is define? ( with
methodinclude).something?), so i know where to define the overload...

Apparently not, since methodinclude).source_location returns nil.

But you can see that the include at the top level is custom for main,
not the same include from modules:

irb(main):001:0> class Foo; end
=> nil

irb(main):002:0> [ methodinclude), methodinclude).owner ]
=> [#<Method: main.include>, #<Class:#<Object:0x000001008b8e58>>]

irb(main):003:0> [ Foo.methodinclude), Foo.methodinclude).owner ]

So from the top level, where i can overload this "include" method?

Good question. I'm not sure where main fits into the method lookup
flow. (But if someone tells me, I'll add it to the diagram

 

[Alexandre Mutel]

Good question. I'm not sure where main fits into the method lookup
flow. (But if someone tells me, I'll add it to the diagram

Seems that overriding like this is working :

$x = methodinclude)
def self.include(mod)
puts "Hi"
$x.call mod
end

 

[Alexandre Mutel]

In a cleaner way, it seems to work on the irb level:

class << self
alias :_old_include_method :include
def include(mod)
puts "Hi"
_old_include_method mod
end
end