jessieh/qrprinter
jessieh/qrprinter
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LuaJIT library facilitating easy encoding and printing of strings as QR codes
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README.md

qrprinter

A wrapper for libqrencode that provides an easy way of encoding and printing strings as QR codes from Lua.

Written in Fennel.

Installation

Install dependencies:

# Debian:
apt install libqrencode-dev

# Alpine:
apk add gcompat libqrencode-dev

Install with luarocks:

luarocks install qrprinter

For a list of available versions, see the luarocks module page.

Example Usage

Documentation

Encoding

qrprinter.encode_string

qrprinter.encode_string( string )

Encodes string into a table representing a QR code.
Returns a two-dimensional sequential table of true/false values representing black/white QR modules.

Printing

All print functions accept an optional table options that may contain two keys:

  • invert: If non-nil, the output colors will be inverted
  • padding: Number of blanks cells to print around the QR code (default 2)

qrprinter.print_qr

qrprinter.print_qr( qr, [options] )

Print qr to stdout using ANSI escape sequences.
Alias of qrprinter.print_qr_ansi.

qrprinter.print_qr_ascii

qrprinter.print_qr_ascii( qr, [options] )

Print qr to stdout using ASCII characters.

qrprinter.print_qr_ansi

qrprinter.print_qr_ansi( qr, [options] )

Print qr to stdout using ANSI escape sequences.

qrprinter.print_qr_utf8

qrprinter.print_qr_utf8( qr, [options] )

Print qr to stdout using UTF8 block elements.