discourse/lib/timeline_lookup.rb

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# frozen_string_literal: true
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module TimelineLookup
# Given an array of tuples containing (id, days_ago), return at most `max_values` worth of a
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# lookup table to help the front end timeline display dates associated with posts
def self.build(tuples, max_values = 300)
result = []
every = (tuples.size.to_f / max_values).ceil
last_days_ago = -1
tuples.each_with_index do |t, idx|
return result unless t.is_a?(Array)
if idx != tuples.size - 1
next unless (idx % every) === 0
end
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days_ago = t[1]
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if (days_ago != last_days_ago)
result << [idx + 1, days_ago]
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last_days_ago = days_ago
end
end
result
end
end