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require 'immutable/list'
# Monkey-patches to Ruby's built-in `IO` class.
# @see http://www.ruby-doc.org/core/IO.html
class IO
# Return a lazy list of "records" read from this IO stream.
# "Records" are delimited by `$/`, the global input record separator string.
# By default, it is `"\n"`, a newline.
#
# @return [List]
def to_list(sep = $/) # global input record separator
Immutable::LazyList.new do
line = gets(sep)
if line
Immutable::Cons.new(line, to_list)
else
EmptyList
end
end
end
end
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