Pastable version of Open hours grouping

<pre class='prettyprint' language='ruby'>WEEKDAYS = %w(mon tue wed thu fri sat sun)

dates = [
  {:day =&gt; WEEKDAYS[0], :time =&gt; '9:00 - 20:00'},
  {:day =&gt; WEEKDAYS[1], :time =&gt; '9:00 - 20:00'},
  {:day =&gt; WEEKDAYS[2], :time =&gt; '9:00 - 20:00'},
  {:day =&gt; WEEKDAYS[3], :time =&gt; '8:00 - 19:00'},
  {:day =&gt; WEEKDAYS[4], :time =&gt; '9:00 - 20:00'},
  {:day =&gt; WEEKDAYS[5], :time =&gt; '8:00 - 19:00'},
  {:day =&gt; WEEKDAYS[6], :time =&gt; 'closed'}
]

def build_opening_hours dates
  ret = []

dates.each do |day|
    d = ret.detect {|v| day[:time] == v[:time] }
    if d.nil?
      ret.push({:days =&gt; [day[:day]], :time =&gt; day[:time]})
    else
      d[:days] &lt;&lt; day[:day]
    end
  end

data = []

ret.each do |v|
    previous = nil
    v[:days].each do |day|
      index = WEEKDAYS.index(day)
      day_text = &quot;opening_hours_#{day}&quot;
      if previous.nil?
        data.push([day_text, v[:time]])
      else
        if ((index - 1) == previous)
          data.last[0] = data.last[0].gsub(/ - .*$/, '')
          data.last[0] += ' - ' + day_text
        else
          data.last[0] += ', ' + day_text
        end
      end
      previous = index
    end
  end

ret = []

data.each do |d|
    ret.push(d.join(': '))
  end

ret
end

p build_opening_hours(dates)

# [
# &quot;opening_hours_mon - opening_hours_wed, opening_hours_fri: 9:00 - 20:00&quot;,
# &quot;opening_hours_thu, opening_hours_sat: 8:00 - 19:00&quot;,
# &quot;opening_hours_sun: closed&quot;
# ]</pre>
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Pastable version of Open hours grouping