Print formatted week in Markdown

FormattedMarkdownWeek.swift

import Foundation

/// Prints the week in Markdown format. Useful for planning. Throw this into a TextExpander shell script!
func markdownWeek() -> String {
  let cal = Calendar.current

  func weekDay(of date: Date) -> Int {
    cal.component(.weekday, from: date)
  }

  func nextDay(from date: Date, count: Int = 1) -> Date {
    cal.date(byAdding: .day, value: count, to: date)!
  }

  func formattedWeekOfYear(for date: Date) -> String {
    let week = cal.component(.weekOfYear, from: date)
    let year = cal.component(.yearForWeekOfYear, from: date)

    let weekFormatter = NumberFormatter()
    weekFormatter.minimumIntegerDigits = 2
    let formattedWeek = weekFormatter.string(from: week as NSNumber)!

    return "\(year)-W\(formattedWeek)"
  }

  let dayFormatter = DateFormatter()
  dayFormatter.dateFormat = "EEEE yyyy-MM-dd"

  func formattedDayEntry(for date: Date) -> String {
    let datePortion = dayFormatter.string(from: date)
    return "## \(datePortion)\n\n- "
  }
  
  func thisMonday() -> Date {
    var currentDate = Date()
    var currentWeekday = weekDay(of: currentDate)
    while currentWeekday != 2 { // 2 = monday
      currentDate = nextDay(from: currentDate)
      currentWeekday = weekDay(of: currentDate)
    }
    return currentDate
  }

  let monday = thisMonday()
  let dayComponents = (0...6)
    .map { nextDay(from: monday, count: $0) }
    .map(formattedDayEntry(for:))
  let components = ["# \(formattedWeekOfYear(for: monday))"] + dayComponents
  return components.joined(separator: "\n\n")
}

print(markdownWeek())