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havenwood/window.rb Secret

Created March 31, 2020 22:14
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window.rb
class Window < IO
SEEK_LINE = 2
def self.for_fd(...)
super(...).tap { _1.seek SEEK_LINE }
end
end
example_io = File.open 'example.io'
window = Window.for_fd example_io.fileno
window.readline
#=> "Second line ..."
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