Strings

Format a text receipt

Line up columns with padding, center a heading, and wrap a long note.

Reference

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Sourceupstream/strings/receipt.vibe
type Line = { item: string, qty: int, price: money }

def row(left: string, right: string) -> string
  left.ljust(32 - right.length, ".") + right
end

def wrap(text: string, width: int) -> array<string>
  lines: array<string> = []
  current = ""
  text.split.each { |word|
    if current.empty?
      current = word
    elsif current.length + 1 + word.length <= width
      current = "#{current} #{word}"
    else
      lines << current
      current = word
    end
  }
  lines << current if !current.empty?
  lines
end

def run -> array<string>
  lines: array<Line> = [
    { item: "Espresso", qty: 2, price: money("3.25 USD") },
    { item: "Almond croissant", qty: 1, price: money("4.75 USD") },
    { item: "Sparkling water", qty: 3, price: money("2.00 USD") }
  ]
  total = lines.sum(money("0.00 USD")) { |line| line["price"] * line["qty"] }

  receipt = ["CORNER CAFE".center(32), "-" * 32]
  lines.each { |line|
    cost = line["price"] * line["qty"]
    receipt << row("#{line["qty"]} x #{line["item"]}", cost.to_s)
  }
  receipt << "-" * 32
  receipt << row("TOTAL", total.to_s)
  note = "Thanks for stopping by. Show this receipt for a free refill before noon."
  receipt + wrap(note, 32)
end

Output

Click Run example to see the result.

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