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havenwood/pread_lines.rb Secret

Created October 9, 2018 20:59
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pread_lines.rb
offsets = File.open filename do |file|
line_offsets = []
loop do
line_offsets << file.pos
file.readline
rescue EOFError
break line_offsets
end
end
File.open filename do |file|
offsets.each_cons(2).each do |start, finish|
puts file.pread finish - start, start
end
end
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