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# -*- mode: ruby -*-
require 'nokogiri'
require 'open-uri'
doc = Nokogiri::HTML(URI.open(ARGV[0] || 'https://www.timeanddate.com/time/zones/'))
h = {}
doc.css('#tz-abb tbody tr').each do |tr|
tds = tr.css('td')
abbr = tds[0].text.strip.downcase
offset = tds[3].text.strip.gsub(/UTC\s*/, '')
next if offset.include?('/') # skip ambiguous timezones
next if offset.empty?
hour, min = offset.split(':', 2)
offset = (Integer(hour) * 60 + (Integer(min || 0)))*60
if h.has_key?(abbr)
h[abbr] = false
else
h[abbr] = offset
end
end
h.delete_if{|_,v| !v}
lines = File.readlines('zonetab.list')
lines.map! do |l|
if (sep = /^%%/ =~ l)...(sep = /^%%/ =~ l) and !sep
z, o = l.split(/,\s*/, 2)
o.strip!
if ho = h.delete(z) and ho != eval(o)
warn "offset of #{z}: #{o} -> #{ho}"
l = l.sub(/,\s*\K.*/) {
if o.include?("*")
o1, o2 = ho.abs.divmod(3600)
o1 = "#{o1}*3600"
o1 = "(#{o1}+#{o2})" if o2 != 0
ho < 0 ? "-#{o1}" : o1
else
ho.to_s
end
}
end
end
l
end
lines.insert(-2, h.sort.map{|k,v| "#{k},#{v}\n"})
lines.flatten!
File.write('zonetab.list', lines.join)
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