InvoicePrinter Library

Usage

The simplest way how to create your invoice PDF is to create an invoice object and pass it to printer:

item = InvoicePrinter::Document::Item.new(
  ...
)

invoice = InvoicePrinter::Document.new(
  ...
  items: [item, ...]
)

InvoicePrinter.print(
  document: invoice,
  file_name: 'invoice.pdf'
)

# Or render PDF directly
InvoicePrinter.render(
  document: invoice
)

Here is an full example for creating the document object:

item = InvoicePrinter::Document::Item.new(
  name: 'Web consultation',
  breakdown: 'Excludes 1h free consultation',
  quantity: nil,
  unit: 'hours',
  price: '$ 25',
  tax: '$ 1',
  amount: '$ 100'
)

provider_address = <<~ADDRESS
  Rolnická 1
  747 05  Opava
  Kateřinky
ADDRESS

invoice = InvoicePrinter::Document.new(
  number: '201604030001',
  provider_name: 'Business s.r.o.',
  provider_tax_id: '56565656',
  provider_tax_id2: '465454',
  provider_lines: provider_address,
  purchaser_name: 'Adam',
  purchaser_tax_id: '',
  purchaser_tax_id2: '',
  purchaser_lines: "Ostravská 1\n747 70  Opava",
  issue_date: '19/03/3939',
  due_date: '19/03/3939',
  subtotal: '175',
  tax: '5',
  tax2: '10',
  tax3: '20',
  total: '$ 200',
  bank_account_number: '156546546465',
  account_iban: 'IBAN464545645',
  account_swift: 'SWIFT5456',
  description: 'We are invoicing the following items:',
  items: [item],
  note: 'A note...'
)

Note: provider_lines and purchaser_lines are 4 lines of data separated by new line character\n. Other lines are being stripped.

Note: There is variable field that can be used for any extra column.

Ruby on Rails

If you want to use InvoicePrinter for printing PDF documents directly from Rails actions, you can:

# GET /invoices/1
def show
  invoice = InvoicePrinter::Document.new(...)

  respond_to do |format|
    format.pdf {
      @pdf = InvoicePrinter.render(
        document: invoice
      )
      send_data @pdf, type: 'application/pdf', disposition: 'inline'
    }
  end
end

JSON format

JSON format is supported via from_json method. JSON itself mimicks the original Ruby objects:

json = InvoicePrinter::Document.new(...).to_json
document = InvoicePrinter::Document.from_json(json)


InvoicePrinter.print(
  document:  document,
  ...
)

Customization

Page size

Both A4 and US letter is supported. Just pass page_size as an argument to print or render methods:

InvoicePrinter.print(
  document: invoice,
  labels: labels,
  page_size: :a4,
  file_name: 'invoice.pdf'
)

:letter is the default.

Localization

To localize your documents you can set both global defaults or instance overrides:

InvoicePrinter.labels = {
  provider: 'Dodavatel'
}

labels = {
  purchaser: 'Customer'
}

InvoicePrinter.print(
  document: invoice,
  labels: labels,
  file_name: 'invoice.pdf'
)

Here is the full list of labels to configure. You can paste and edit this block to initializers/invoice_printer.rb if you are using Rails.

InvoicePrinter.labels = {
  name: 'Invoice',
  provider: 'Provider',
  purchaser: 'Purchaser',
  tax_id: 'Identification number',
  tax_id2: 'Identification number',
  payment: 'Payment',
  payment_by_transfer: 'Payment by bank transfer on the account below:',
  payment_in_cash: 'Payment in cash',
  account_number: 'Account NO',
  swift: 'SWIFT',
  iban: 'IBAN',
  issue_date: 'Issue date',
  due_date: 'Due date',
  variable_symbol: 'Variable symbol',
  item: 'Item',
  variable: '',
  quantity: 'Quantity',
  unit: 'Unit',
  price_per_item: 'Price per item',
  amount: 'Amount',
  tax: 'Tax',
  tax2: 'Tax 2',
  tax3: 'Tax 3',
  subtotal: 'Subtotal',
  total: 'Total'
}

Note: variable fields lack default label. You should provide one.

You can also use sublabels feature to provide the document in two languages:

labels = {
  ...
}

sublabels = {
  name: 'Faktura',
  provider: 'Prodejce',
  purchaser: 'Kupující',
  tax_id: 'IČ',
  tax_id2: 'DIČ',
  payment: 'Forma úhrady',
  payment_by_transfer: 'Platba na následující účet:',
  account_number: 'Číslo účtu',
  issue_date: 'Datum vydání',
  due_date: 'Datum splatnosti',
  variable_symbol: 'Variabilní symbol',
  item: 'Položka',
  variable: '',
  quantity: 'Počet',
  unit: 'MJ',
  price_per_item: 'Cena za položku',
  amount: 'Celkem bez daně',
  subtotal: 'Cena bez daně',
  tax: 'DPH 21 %',
  total: 'Celkem'
}

labels.merge!({ sublabels: sublabels })

...

Now the document will have little sublabels next to the original labels in Czech.

Font

To support specific characters you might need to specify a TTF font to be used:

InvoicePrinter.print(
  ...
  font: File.expand_path('../Overpass-Regular.ttf', __FILE__)
)

If you don't have a font around, you can install invoice_printer_fonts gem and specify the supported font name instead:

InvoicePrinter.print(
  document: invoice,
  font: "roboto"
)

Supported builtin fonts are: overpass, opensans, and roboto. Note that searching the path takes preference.

Background

To include a background image you might need to create the file according to the size and resolution to be used (see: examples/background.png):

InvoicePrinter.print(
  ...
  background: File.expand_path('../background.png', __FILE__)
)