invoicing: Prawn PDF renderer with Noto fonts
InvoicePdf.render(invoice) returns A4 PDF bytes. Layout: title + number, horizontal rule, two-column FROM/BILL TO, meta strip (issued/due/currency/ status) bracketed by rules, line items table, right-aligned totals with optional GEL equivalent, payment block (Bank of Georgia IBAN), optional notes, repeating footer with issuer ID and page number. Both party columns capture pdf.y after rendering and the global cursor jumps to whichever ran longer — avoids the bbox cursor-restore footgun that was collapsing the meta strip into the FROM column. Noto Sans Georgian is registered as a fallback family so the Georgian legal name renders without needing a separate text run. Issuer details (legal name, tax ID, registration, address, bank) are hardcoded as a constant — these are public on the rendered site already and change rarely enough that a config file would be overkill.
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lib/invoice_pdf.rb
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lib/invoice_pdf.rb
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require 'prawn'
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require 'prawn/table'
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require 'bigdecimal'
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class InvoicePdf
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FONTS_DIR = File.join($root, 'public', 'fonts')
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ISSUER = {
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name_latin: 'IE Sergei Poljanski',
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name_alt: 'SERGEI POLJANSKI',
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name_georgian: 'ინდ. მეწარმე სერგეი პოლჯანსკი',
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tax_id: '304813343',
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reg_number: 'B26353511',
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registered: '2026-05-04',
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address: [
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'Ilia and Nino Nakashidze St, N 1, Building N3, Apt N3',
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'Krtsanisi, Tbilisi, Georgia'
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],
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email: 'me@asxp.io',
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phone: '+995 595 026 471',
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bank_name: 'Bank of Georgia',
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iban: 'GE53BG0000000612343299',
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swift: 'BAGAGE22'
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}.freeze
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COLOR_TEXT = '111111'.freeze
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COLOR_MUTED = '6F6F6F'.freeze
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COLOR_RULE = 'DADADA'.freeze
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COLOR_ACCENT = '1A1A1A'.freeze
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def self.render(invoice)
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new(invoice).render
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end
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def initialize(invoice)
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@invoice = invoice
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end
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def render
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pdf = Prawn::Document.new(
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page_size: 'A4',
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margin: [40, 50, 50, 50],
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info: {
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Title: "Invoice #{@invoice.number}",
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Author: ISSUER[:name_latin],
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Creator: 'asxp.io'
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}
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)
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register_fonts(pdf)
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pdf.font('NotoSans')
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pdf.fill_color COLOR_TEXT
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draw_header(pdf)
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draw_parties(pdf)
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draw_meta(pdf)
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draw_items(pdf)
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draw_totals(pdf)
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draw_payment(pdf)
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draw_footer(pdf)
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pdf.render
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end
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private
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def register_fonts(pdf)
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pdf.font_families.update(
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'NotoSans' => {
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normal: File.join(FONTS_DIR, 'NotoSans-Regular.ttf'),
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bold: File.join(FONTS_DIR, 'NotoSans-Bold.ttf'),
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italic: File.join(FONTS_DIR, 'NotoSans-Italic.ttf')
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},
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'NotoSansGeorgian' => {
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normal: File.join(FONTS_DIR, 'NotoSansGeorgian-Regular.ttf'),
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bold: File.join(FONTS_DIR, 'NotoSansGeorgian-Bold.ttf')
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}
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)
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pdf.fallback_fonts = ['NotoSansGeorgian']
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end
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def draw_header(pdf)
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pdf.font_size(20) { pdf.text 'INVOICE', style: :bold, character_spacing: 2 }
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pdf.move_down 2
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pdf.fill_color COLOR_MUTED
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pdf.font_size(9) { pdf.text @invoice.number }
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pdf.fill_color COLOR_TEXT
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pdf.move_down 16
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pdf.stroke_color COLOR_RULE
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pdf.stroke_horizontal_rule
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pdf.move_down 16
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end
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def draw_parties(pdf)
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top_y = pdf.y
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right = 285
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col_w = 250
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pdf.bounding_box([0, pdf.cursor], width: col_w) do
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draw_party_label(pdf, 'FROM')
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pdf.font_size(11) { pdf.text ISSUER[:name_latin], style: :bold, leading: 2 }
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pdf.font_size(9) do
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pdf.text ISSUER[:name_georgian], leading: 4
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pdf.move_down 8
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pdf.text ISSUER[:address].join("\n"), leading: 3
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pdf.move_down 8
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pdf.text "Tax ID: #{ISSUER[:tax_id]}", leading: 3
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pdf.text "Reg. №: #{ISSUER[:reg_number]} (#{ISSUER[:registered]})", leading: 3
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pdf.move_down 8
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pdf.text ISSUER[:email], leading: 3
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pdf.text ISSUER[:phone]
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end
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end
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from_y = pdf.y
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pdf.y = top_y
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pdf.bounding_box([right, pdf.cursor], width: pdf.bounds.right - right) do
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draw_party_label(pdf, 'BILL TO')
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pdf.font_size(11) { pdf.text @invoice.client_name, style: :bold, leading: 2 }
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pdf.font_size(9) do
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pdf.text @invoice.client_email, leading: 3
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unless @invoice.client_address.to_s.strip.empty?
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pdf.move_down 8
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pdf.text @invoice.client_address, leading: 3
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end
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end
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end
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bill_y = pdf.y
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pdf.y = [from_y, bill_y].min
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pdf.move_down 24
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end
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def draw_party_label(pdf, label)
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pdf.fill_color COLOR_MUTED
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pdf.font_size(8) { pdf.text label, character_spacing: 1.5 }
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pdf.fill_color COLOR_TEXT
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pdf.move_down 8
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end
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def draw_meta(pdf)
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pdf.stroke_color COLOR_RULE
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pdf.stroke_horizontal_rule
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pdf.move_down 10
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cells = [
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['ISSUED', @invoice.issued_on.strftime('%Y-%m-%d')],
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['DUE', @invoice.due_on.strftime('%Y-%m-%d')],
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['CURRENCY', @invoice.currency],
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['STATUS', @invoice.status.upcase]
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]
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col_w = pdf.bounds.width / cells.size.to_f
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top = pdf.cursor
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cells.each_with_index do |(label, value), i|
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pdf.bounding_box([i * col_w, top], width: col_w) do
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pdf.fill_color COLOR_MUTED
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pdf.font_size(7) { pdf.text label, character_spacing: 1.2 }
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pdf.fill_color COLOR_TEXT
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pdf.move_down 3
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pdf.font_size(10) { pdf.text value, style: :bold }
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end
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end
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# Reserve the height the row actually used.
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pdf.move_down 30
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pdf.stroke_horizontal_rule
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pdf.move_down 16
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end
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def draw_items(pdf)
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header = ['Description', 'Qty', "Unit (#{@invoice.currency})", "Amount (#{@invoice.currency})"]
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rows = @invoice.items_array.map do |i|
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qty = BigDecimal(i['qty'].to_s)
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unit = BigDecimal(i['unit_price'].to_s)
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[i['description'], fmt_qty(qty), fmt_money(unit), fmt_money(qty * unit)]
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end
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table_data = [header] + rows
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pdf.table(table_data, header: true, width: pdf.bounds.width,
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column_widths: { 0 => pdf.bounds.width - 270, 1 => 60, 2 => 100, 3 => 110 }) do
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cells.borders = [:bottom]
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cells.border_color = COLOR_RULE
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cells.padding = [8, 8, 8, 8]
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cells.size = 9
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row(0).font_style = :bold
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row(0).text_color = COLOR_MUTED
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row(0).size = 8
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row(0).background_color = 'FAFAFA'
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columns(1..3).align = :right
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end
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pdf.move_down 8
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end
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def draw_totals(pdf)
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total = @invoice.total
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rows = [
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['Subtotal', "#{@invoice.currency} #{fmt_money(total)}"],
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['Total', "#{@invoice.currency} #{fmt_money(total)}"]
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]
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if @invoice.currency != 'GEL'
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rows << ["In GEL (rate #{fmt_money(@invoice.gel_rate)})", "GEL #{fmt_money(@invoice.total_gel)}"]
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end
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pdf.bounding_box([pdf.bounds.right - 270, pdf.cursor], width: 270) do
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pdf.table(rows, cell_style: { borders: [], padding: [4, 0, 4, 0], size: 10 },
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column_widths: { 0 => 130, 1 => 140 }) do
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columns(0).text_color = COLOR_MUTED
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columns(1).align = :right
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row(1).font_style = :bold
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row(1).text_color = COLOR_ACCENT
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row(1).size = 12
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end
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end
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pdf.move_down 30
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end
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def draw_payment(pdf)
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pdf.fill_color COLOR_MUTED
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pdf.font_size(8) { pdf.text 'PAYMENT', character_spacing: 1.5 }
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pdf.fill_color COLOR_TEXT
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pdf.move_down 4
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pdf.font_size(9) do
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pdf.text "Bank: #{ISSUER[:bank_name]}"
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pdf.text "IBAN: #{ISSUER[:iban]}"
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pdf.text "SWIFT: #{ISSUER[:swift]}"
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pdf.text "Beneficiary: #{ISSUER[:name_latin]}"
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end
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unless @invoice.notes.to_s.strip.empty?
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pdf.move_down 14
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pdf.fill_color COLOR_MUTED
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pdf.font_size(8) { pdf.text 'NOTES', character_spacing: 1.5 }
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pdf.fill_color COLOR_TEXT
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pdf.move_down 4
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pdf.font_size(9) { pdf.text @invoice.notes }
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end
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end
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def draw_footer(pdf)
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pdf.repeat(:all) do
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pdf.canvas do
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pdf.fill_color COLOR_MUTED
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pdf.font_size(8) do
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pdf.draw_text(
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"#{ISSUER[:name_latin]} · Tax ID #{ISSUER[:tax_id]} · Small Business (1% turnover tax)",
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at: [50, 25]
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)
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pdf.draw_text("Page #{pdf.page_number}", at: [pdf.bounds.right - 50, 25])
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end
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pdf.fill_color COLOR_TEXT
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end
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end
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end
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def fmt_money(value)
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BigDecimal(value.to_s).round(2).to_s('F').then { |s| with_thousands(s) }
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end
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def fmt_qty(value)
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bd = BigDecimal(value.to_s)
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bd.frac.zero? ? bd.to_i.to_s : bd.to_s('F')
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end
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def with_thousands(numstr)
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int, frac = numstr.split('.')
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int = int.reverse.gsub(/(\d{3})(?=\d)/, '\\1,').reverse
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frac ? "#{int}.#{frac.ljust(2, '0')[0, 2]}" : "#{int}.00"
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end
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end
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