test.rb

#!/usr/bin/env ruby

[].filter_map {} # filter_map support check

require 'net/http'

MIRRORLIST = Net::HTTP.get(URI('https://www.archlinux.org/mirrorlist/?country=KR&country=JP&country=SG&country=TW&country=HK&protocol=https'))

ARCH = `uname -m`.strip
REPO = 'core'
PREFIX = "curl -L --silent --max-time 3 --output /dev/null --write-out '%{http_code} %{time_total}"

def template(pattern)
	url = pattern.sub('$arch', ARCH).sub('$repo', REPO)
	"#{PREFIX} #{pattern}' #{url}/#{REPO}.db"
end

RUNNERS = MIRRORLIST.strip.lines.filter_map do |line|
	next unless line.start_with? '#Server '
	pattern = line.strip.sub /^#Server = /, ''
	template(pattern)
end

RESULTS = RUNNERS.filter_map do |line|
	code, seconds, url = `#{line}`.split
	next unless code == '200'
	puts "## Server = #{url} # #{seconds}"
	[seconds.to_f, url]
end.sort_by{|sec, _| sec}

puts

RESULTS.each do |sec, url|
	puts "# #{sec} seconds"
	puts "Server = #{url}"
end