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require 'chronic'
module Whenever
module Output
class Cron
DAYS = %w(sun mon tue wed thu fri sat)
MONTHS = %w(jan feb mar apr may jun jul aug sep oct nov dec)
KEYWORDS = [:reboot, :yearly, :annually, :monthly, :weekly, :daily, :midnight, :hourly]
REGEX = /^(@(#{KEYWORDS.join '|'})|((\*?[\d\/,\-]*)\s){3}(\*?([\d\/,\-]|(#{MONTHS.join '|'}))*\s)(\*?([\d\/,\-]|(#{DAYS.join '|'}))*))$/i
attr_accessor :time, :task
def initialize(time = nil, task = nil, at = nil, options = {})
chronic_options = options[:chronic_options] || {}
@at_given = at
@time = time
@task = task
@at = at.is_a?(String) ? (Chronic.parse(at, chronic_options) || 0) : (at || 0)
end
def self.enumerate(item, detect_cron = true)
if item and item.is_a?(String)
items =
if detect_cron && item =~ REGEX
[item]
else
item.split(',')
end
else
items = item
items = [items] unless items and items.respond_to?(:each)
end
items
end
def self.output(times, job, options = {})
enumerate(times).each do |time|
enumerate(job.at, false).each do |at|
yield new(time, job.output, at, options).output
end
end
end
def output
[time_in_cron_syntax, task].compact.join(' ').strip
end
def time_in_cron_syntax
@time = @time.to_i if @time.is_a?(Numeric) # Compatibility with `1.day` format using ruby 2.3 and activesupport
case @time
when REGEX then @time # raw cron syntax given
when Symbol then parse_symbol
when String then parse_as_string
else parse_time
end
end
protected
def day_given?
@at_given.is_a?(String) && (MONTHS.any? { |m| @at_given.downcase.index(m) } || @at_given[/\d\/\d/])
end
def parse_symbol
shortcut = case @time
when *KEYWORDS then "@#{@time}" # :reboot => '@reboot'
when :year then Whenever.seconds(1, :year)
when :day then Whenever.seconds(1, :day)
when :month then Whenever.seconds(1, :month)
when :week then Whenever.seconds(1, :week)
when :hour then Whenever.seconds(1, :hour)
when :minute then Whenever.seconds(1, :minute)
end
if shortcut.is_a?(Numeric)
@time = shortcut
parse_time
elsif shortcut
if @at.is_a?(Time) || (@at.is_a?(Numeric) && @at > 0)
raise ArgumentError, "You cannot specify an ':at' when using the shortcuts for times."
else
return shortcut
end
else
parse_as_string
end
end
def parse_time
timing = Array.new(5, '*')
case @time
when Whenever.seconds(0, :seconds)...Whenever.seconds(1, :minute)
raise ArgumentError, "Time must be in minutes or higher"
when Whenever.seconds(1, :minute)...Whenever.seconds(1, :hour)
minute_frequency = @time / 60
timing[0] = comma_separated_timing(minute_frequency, 59, @at || 0)
when Whenever.seconds(1, :hour)...Whenever.seconds(1, :day)
hour_frequency = (@time / 60 / 60).round
timing[0] = @at.is_a?(Time) ? @at.min : range_or_integer(@at, 0..59, 'Minute')
timing[1] = comma_separated_timing(hour_frequency, 23)
when Whenever.seconds(1, :day)...Whenever.seconds(1, :month)
day_frequency = (@time / 24 / 60 / 60).round
timing[0] = @at.is_a?(Time) ? @at.min : 0
timing[1] = @at.is_a?(Time) ? @at.hour : range_or_integer(@at, 0..23, 'Hour')
timing[2] = comma_separated_timing(day_frequency, 31, 1)
when Whenever.seconds(1, :month)...Whenever.seconds(1, :year)
month_frequency = (@time / 30 / 24 / 60 / 60).round
timing[0] = @at.is_a?(Time) ? @at.min : 0
timing[1] = @at.is_a?(Time) ? @at.hour : 0
timing[2] = if @at.is_a?(Time)
day_given? ? @at.day : 1
else
@at == 0 ? 1 : range_or_integer(@at, 1..31, 'Day')
end
timing[3] = comma_separated_timing(month_frequency, 12, 1)
when Whenever.seconds(1, :year)
timing[0] = @at.is_a?(Time) ? @at.min : 0
timing[1] = @at.is_a?(Time) ? @at.hour : 0
timing[2] = if @at.is_a?(Time)
day_given? ? @at.day : 1
else
1
end
timing[3] = if @at.is_a?(Time)
day_given? ? @at.month : 1
else
@at == 0 ? 1 : range_or_integer(@at, 1..12, 'Month')
end
else
return parse_as_string
end
timing.join(' ')
end
def parse_as_string
return unless @time
string = @time.to_s
timing = Array.new(4, '*')
timing[0] = @at.is_a?(Time) ? @at.min : 0
timing[1] = @at.is_a?(Time) ? @at.hour : 0
return (timing << '1-5') * " " if string.downcase.index('weekday')
return (timing << '6,0') * " " if string.downcase.index('weekend')
DAYS.each_with_index do |day, i|
return (timing << i) * " " if string.downcase.index(day)
end
raise ArgumentError, "Couldn't parse: #{@time.inspect}"
end
def range_or_integer(at, valid_range, name)
must_be_between = "#{name} must be between #{valid_range.min}-#{valid_range.max}"
if at.is_a?(Range)
raise ArgumentError, "#{must_be_between}, #{at.min} given" unless valid_range.include?(at.min)
raise ArgumentError, "#{must_be_between}, #{at.max} given" unless valid_range.include?(at.max)
return "#{at.min}-#{at.max}"
end
raise ArgumentError, "#{must_be_between}, #{at} given" unless valid_range.include?(at)
at
end
def comma_separated_timing(frequency, max, start = 0)
return start if frequency.nil? || frequency == "" || frequency.zero?
return '*' if frequency == 1
return frequency if frequency > (max * 0.5).ceil
original_start = start
start += frequency unless (max + 1).modulo(frequency).zero? || start > 0
output = (start..max).step(frequency).to_a
max_occurances = (max.to_f / (frequency.to_f)).round
max_occurances += 1 if original_start.zero?
output[0, max_occurances].join(',')
end
end
end
end
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