Script to toggle timezones in i3blocks

timezone.rb

#!/bin/ruby
#
# Toggle timezones in i3blocks
# Author: Vivien Didelot <vivien.didelot@gmail.com>
#
# Fill the ZONES array and define a block like this:
#
#     [timezone]
#     command=THIS_SCRIPT
#     interval=5

ZONES = [
  "Europe/Paris",
  "America/Montreal",
  "Indian/Reunion",
]

CACHE = "/tmp/tz"

def datetime zone, format
  %x(TZ=#{zone} date '+#{format}')
end

if File.exist? CACHE
  index = File.read(CACHE).to_i
else
  index = 0
end

# toggle on click
if ENV["BLOCK_BUTTON"].to_i > 0
  # cache the index
  index = (index + 1) % ZONES.size
  File.open(CACHE, 'w') { |f| f.write(index) }
end

zone = ZONES[index]
city = zone.split('/').last

puts "#{city}: #{datetime(zone, "%Y-%m-%d %T")}"
puts "#{city.chars.first}: #{datetime(zone, "%T")}"
puts "#77FF77"

# vim: ts=2 sw=2 et