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module DatetimeHelper
def relative_distance(time, now = Time.current)
seconds = (now - time).abs
case seconds
when 0...90
[1, :minute]
when 90...45.minutes
[(seconds / 60).round, :minute]
when 45.minutes...24.hours
[(seconds / 1.hour).round, :hour]
when 24.hours...30.days
[(seconds / 1.day).round, :day]
when 30.days...365.days
[(seconds / 30.days).round, :month]
else
[(seconds / 365.days).round, :year]
end
end
RELATIVE_TIME_UNIT_FORMS = {
en: {
minute: { one: "minute", other: "minutes" },
hour: { one: "hour", other: "hours" },
day: { one: "day", other: "days" },
month: { one: "month", other: "months" },
year: { one: "year", other: "years" },
},
de: {
# "other" here is the DATIVE plural needed after "vor" -- not the
# nominative plural you'd use standing alone ("3 Tage" vs "vor 3
# Tagen"). All five happen to be the nominative plural + "n", since
# none of them already end in -n or -s -- a property of these five
# specific words, not a rule to extend to new units without checking.
minute: { one: "Minute", other: "Minuten" },
hour: { one: "Stunde", other: "Stunden" },
day: { one: "Tag", other: "Tagen" },
month: { one: "Monat", other: "Monaten" },
year: { one: "Jahr", other: "Jahren" },
},
}.freeze
def relative_time_phrase(time, now = Time.current)
count, unit = relative_distance(time, now)
locale = I18n.locale.to_sym
forms = RELATIVE_TIME_UNIT_FORMS.fetch(locale, RELATIVE_TIME_UNIT_FORMS[:en])
word = forms.fetch(unit).fetch(count == 1 ? :one : :other)
locale == :de ? "vor #{count} #{word}" : "#{count} #{word} ago"
end
end
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