зеркало из https://github.com/github/ruby.git
63 строки
1.1 KiB
Ruby
63 строки
1.1 KiB
Ruby
require 'getoptlong'
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options = GetoptLong.new(
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['--number', '-n', GetoptLong::REQUIRED_ARGUMENT],
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['--verbose', '-v', GetoptLong::OPTIONAL_ARGUMENT],
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['--help', '-h', GetoptLong::NO_ARGUMENT]
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)
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def help(status = 0)
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puts <<~HELP
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Usage:
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-n n, --number n:
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Compute Fibonacci number for n.
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-v [boolean], --verbose [boolean]:
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Show intermediate results; default is 'false'.
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-h, --help:
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Show this help.
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HELP
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exit(status)
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end
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def print_fibonacci (number)
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return 0 if number == 0
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return 1 if number == 1 or number == 2
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i = 0
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j = 1
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(2..number).each do
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k = i + j
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i = j
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j = k
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puts j if @verbose
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end
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puts j unless @verbose
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end
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options.each do |option, argument|
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case option
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when '--number'
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@number = argument.to_i
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when '--verbose'
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@verbose = if argument.empty?
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true
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elsif argument.match(/true/i)
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true
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elsif argument.match(/false/i)
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false
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else
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puts '--verbose argument must be true or false'
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help(255)
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end
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when '--help'
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help
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end
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end
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unless @number
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puts 'Option --number is required.'
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help(255)
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end
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print_fibonacci(@number)
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