Allow to override/extend printer implementations

[IlyaSemenov]

I would like to use my own open() for a ESC/POS printer that I work with.

However, all implementations live in a closure and there is no way to extend or provide an override.

I would expect at least something simple as:

const receipt_data = receiptline.transform(doc, {
	encoding: "cp866",
	command: "escpos",
	commands: {
		open: function (printer) { return "..." }
	},
})

[receiptline]

Thank you for your feedback.

The command object interface was closed and experimental, but now it is stable.

We will consider extending the command object by users.

[techmunk]

I think this would be fantastic! I have an Xprinter that supports ESCPOS, but does not have the "Buzzer" like an Epson printer might, or at least does not understand the command FS ( A pL pH fn m. The print works, it just prints AOC at the start of every receipt. Using sii removes that issue, but barcodes no longer work.

I can work around this with string manipulation, but it would be nice to have more control for some of the generic brand printers that are ESCPOS compatible.

[receiptline]

Hello!

We have just released receiptline V1.7.0.

Printer implementations are now public. receiptline.commands.*

You can now override/extend printer implementations.

Please see receiptline/example/command/custom.js.

Thank you.