bump version script. 1.2.3 => 1.2.4

bump_version.rb

#!/usr/bin/env ruby
require 'optparse'

begin
  OPTS = {unit: 'patch'}
  opt = OptionParser.new
  units = %w{major minor patch}
  opt.on('-u [UNIT]', '--unit', units) {|v| OPTS[:unit] = v}

  opt.parse!(ARGV)

  if ARGV.count != 1
    raise "引数はバージョン番号だけにしてください"
  end

  version = ARGV[0]
  unit = OPTS[:unit]

  unless units.include? unit
    raise "unit は #{units.join("|")} を指定してください"
  end

  unless version.match /\A[0-9]+\.[0-9]+\.[0-9]\z/
    raise "バージョン番号は 12.34.56 の形式で指定してください"
  end

  major, minor, patch = version.split "."

  case unit
  when 'major'
    major = major.to_i + 1
    minor = 0
    patch = 0
  when 'minor'
    minor = minor.to_i + 1
    patch = 0
  when 'patch'
    patch = patch.to_i + 1
  end

  puts "#{major}.#{minor}.#{patch}"
rescue => e
  puts "Error: #{e.message}"
  puts "Example: bump_version.rb -u minor 1.2.3"
end