class Spoom::Timeline

def commits_for_dates(dates)
  dates.map do |t|
    out, _, _ = Spoom::Git.log(
      "--since='#{t}'",
      "--until='#{t.to_date.next_month}'",
      "--format='format:%h'",
      "--author-date-order",
      "-1",
      path: @path,
    )
    next if out.empty?
    out
  end.compact.uniq
end

def initialize(from, to, path: ".")
  @from = from
  @to = to
  @path = path
end

def months
  d = Date.new(@from.year, @from.month, 1)
  to = Date.new(@to.year, @to.month, 1)
  res = [d.to_time]
  while d < to
    d = d.next_month
    res << d.to_time
  end
  res
end

def ticks
  commits_for_dates(months)
end