Left margin option

[locatellidaniel]

Hi,

In the industry I work on it is very common that ticket paper has a color brand stripe to the left side:

In order for the text not be placed over the stripe, some precautions should be taken.

My solution is to add a "margin" parameter ("-m") to receiptio, and then overwrite the "area" command accordingly:

const transform = async (receiptmd, printer) => {
    // ...
    // ...
    if (printer.leftMargin) {
        printer.command = Object.assign(
            {}, 
            typeof printer.command === 'object' ? printer.command : receiptline.commands[printer.command]
        );

        // overwrite area function
        const a = printer.command.area;
        printer.command.area = (left, width, right) => a(left + printer.leftMargin, width, right - printer.leftMargin);
    }
    
    return receiptline.transform(receiptmd, printer);
};

Also, the parameter cpl might need to be adjusted. i.e. with a cpl of 48 and a leftMargin of 2, will give a total width of 50, forcing the wrapping of every line.

So, when cpl is not manually provided it should be adjusted: cpl = default - leftMargin

I'm unsure this should be part of the receiptline or the receiptio tool. My implementation is on receiptio, but it might also fit as a general parameter in receiptline. It could also be extended to right margin, of course.

Regards,