Sorry for the vague question title, but I have no clue what causes the following:
module Capistrano
class Configuration
def puts string
::Kernel.puts 'test'
end
end
end
Now when Capistrano calls puts
, I don't see "test", but I see the original output.
However, when I also add this:
module Kernel
def puts string
::Kernel.puts 'what gives?'
end
end
Now, suddenly, puts
actually returns "test", not "what gives?", not the original content, but "test".
Is there a reasonable explanation why this is happening (besides my limited understanding of the inner-workings of Ruby Kernel)?
Things that look off to me (but somehow "seem to work"):
module Capistrano
class Configuration
def puts string
::Kernel.puts 'test'
end
def an_thing
puts "foo"
end
end
end
Capistrano::Configuration.new.an_thing
gives the output:
test
The second version also gives the same output. The reason is that you're defining an instance level method rather than a class level method (this post seems to do a good job explaining the differences). A slightly different version:
module Kernel
def self.puts string
::Kernel.puts 'what gives?'
end
end
does the following. Because it is causing infinite recursion, like you expected.
/tmp/foo.rb:14:in `puts': stack level too deep (SystemStackError)
from /tmp/foo.rb:14:in `puts'
from /tmp/foo.rb:4:in `puts'
from /tmp/foo.rb:7:in `an_thing'
from /tmp/foo.rb:18
shell returned 1