Class: Time

Inherits:
Object
  • Object
show all
Defined in:
lib/ext/ts_time.rb

Class Method Summary collapse

Class Method Details

.to_sentence(seconds, specificity = 3) ⇒ String

Converts number of seconds to human-readable sentences.

Examples

Time.to_sentence(1.hour) #=> "1 hour"
Time.to_sentence(168.hours) #=> "1 week"
Time.to_sentence(9999.seconds) #=> "2 hours, 46 minutes, 39 seconds"
Time.to_sentence(123456876543.seconds) #=> "4 millennia, 25 decades, 2 years"

Params

Parameters:

  • Number (Numeric) —

    of seconds to convert to a sentence

  • Specificity (Integer) —

    of the sentence (how many clauses are included)

Returns:

  • (String) —

    Generated sentence


17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/ext/ts_time.rb', line 17

def self.to_sentence seconds, specificity = 3

  return 'now' if seconds == 0

  # if seconds is negative, then the time is in the past so later
  # on we'll append "ago" to the return string
  ago = seconds < 0

  # Tracks what the values and names of each unit, as well as the
  # conversion factor needed to go to the next larger unit
  time = [
      { value: seconds.abs,   unit: 'second',      conversion: 60 },
      { value: 0,             unit: 'minute',      conversion: 60 },
      { value: 0,             unit: 'hour',        conversion: 24 },
      { value: 0,             unit: 'day',         conversion: 7 },
      { value: 0,             unit: 'week',        conversion: 4 },
      { value: 0,             unit: 'month',       conversion: 12 },
      { value: 0,             unit: 'year',        conversion: 10 },
      { value: 0,             unit: 'decade',      conversion: 100 },
      { value: 0,             unit: 'millennium',  conversion: nil },
  ]

  # divmod returns both the result of a division and the remainder,
  # which is exactly what we need eg:
  # minutes, seconds = seconds.divmod 60
  time.each_cons(2) do |this_time, next_time|
    next_time[:value], this_time[:value] = this_time[:value].divmod this_time[:conversion]
  end

  # remove any elements that are 0, because we don't need them for the sentence
  time = time.delete_if { |t| t[:value] == 0 }

  # starting with the largest unit first, build the sentence elements
  out = []
  time.reverse.each do |t|
    out << "#{t[:value]} #{t[:unit].pluralize t[:value]}"
    # if we now have the right number of elements, then break
    break if out.count == specificity
  end

  out.join(', ') + (ago ? ' ago' : '')

end