TwLength: Irresponsible message length calculator for posting twitter

tw-length.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

# Implements
module TwLength
  # ref. https://dev.twitter.com/docs/api/1.1/get/help/configuration
  # Someone help me with getting twitter configuration without oAuth? ;(
  #
  #   RESERVED_LENGTH.must_eqal [short_url_length_http, short_url_length_https].max
  MAX_RESERVED_LENGTH = 23

  class << self
    def length(message)
      # ref. https://github.com/shokai/tw/blob/v0.4.6/lib/tw/client/helper.rb
      result = message.chars.size
      message.scan(/https?:\/\/[^\s]+/).each do |x|
        result += MAX_RESERVED_LENGTH - x.chars.size
      end
      result
    end

    def run(message)
      puts length(message)
    end
  end
end

def run_test
  require 'minitest/autorun'
  begin
    require 'minitest/pride'
  rescue LoadError
  end

  describe TwLength do
    it '.length without URI' do
      TwLength.length('foobar').must_equal 6
      TwLength.length('だるい').must_equal 3
    end

    it '.length with URI' do
      TwLength.length('foobar http://example.com/').must_equal 29 + 1
      TwLength.length('だるい https://example.com/').must_equal 27
      TwLength.length('𠮷野家 https://example.com/ http://example.com/').must_equal 50 + 1
    end
  end
end

# Parse options
require 'optparse'
program_name = File.basename(__FILE__)
opt = OptionParser.new do |opts|
  opts.banner = 'TwLength: Irresponsible message length calculator for posting twitter'
  opts.separator <<-EOD

吉吉吉吉吉吉吉吉吉吉吉吉吉吉吉吉
𠮷 Iresponsible design siries 𠮷
吉吉吉𠮷吉吉吉吉吉吉吉吉吉吉吉吉

Usage: #{program_name} [message]

Examples:
  $ #{program_name} '𠮷野屋'
  3

  $ #{program_name} '𠮷野屋 http://example.com/ https://example.com/'
  51

  $ echo foobar | #{program_name}
  6

Options:
  EOD

  opts.on('-s', '--sample', 'Run sample code as usage or examples') do |v|
    cmd = "ruby #{__FILE__} goto 𠮷野屋"
    puts "$ #{cmd}"
    system(*cmd.split)
    exit
  end

  opts.on_tail('-t', '--test', 'Run test **FOR DEVELOPER** ') do
    run_test
    exit
  end

  opts.on_tail('-h', '--help', 'Show this message') do
    puts opts
    exit
  end
end
opt.parse!

if $stdin.tty? && ARGV.empty?
  puts opt
  exit 1
else
  text = ARGV.shift || ARGF.read.chomp #|| 'みんなでワイワイ バーベキューなう'
end

TwLength.run(text)