Function renderActivityHeatmap

packages/arctic/src/cli/cmd/stats.ts:226–325

(dailyActivity: Record<string, number>, days: number)

}

function renderActivityHeatmap(dailyActivity: Record<string, number>, days: number) {
  const termWidth = process.stdout.columns || 80
  const availableWidth = Math.min(termWidth - 10, 80)
  const weeksToShow = Math.min(Math.ceil(days / 7), Math.floor(availableWidth / 2))
  const daysToShow = weeksToShow * 7

  const today = new Date()
  today.setHours(0, 0, 0, 0)

  const startDate = new Date(today)
  startDate.setDate(startDate.getDate() - daysToShow + 1)

  // adjust to start on Sunday
  const dayOfWeek = startDate.getDay()
  if (dayOfWeek !== 0) {
    startDate.setDate(startDate.getDate() - dayOfWeek)
  }

  const maxValue = Math.max(1, ...Object.values(dailyActivity))

  // build weeks array
  const weeks: { date: Date; value: number; level: number }[][] = []
  let currentDate = new Date(startDate)
  let currentWeek: { date: Date; value: number; level: number }[] = []

  while (currentDate <= today) {
    const dateKey = currentDate.toISOString().split("T")[0]
    const value = dailyActivity[dateKey] || 0
    const level = value === 0 ? 0 : Math.min(4, Math.ceil((value / maxValue) * 4))

    if (currentDate.getDay() === 0 && currentWeek.length > 0) {
      weeks.push(currentWeek)
      currentWeek = []
    }

    currentWeek.push({ date: new Date(currentDate), value, level })
    currentDate.setDate(currentDate.getDate() + 1)
  }

  if (currentWeek.length > 0) {
    weeks.push(currentWeek)
  }

  // month labels
  const monthLabels: { month: string; position: number }[] = []
  let lastMonth = -1
  for (let i = 0; i < weeks.length; i++) {
    const week = weeks[i]
    if (!week || week.length === 0) continue
    const firstDay = week[0].date
    const month = firstDay.getMonth()
    if (month !== lastMonth) {
      monthLabels.push({
        month: firstDay.toLocaleString("en-US", { month: "short" }),
        position: i,
      })
      lastMonth = month
    }