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# qrprinter .gitignore
# Temp files
*~
\#*\#
.\#*
# Build folder
build/

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# qrprinter Makefile
# Produces .lua files from the .fnl source files
SRC_DIR = src
BUILD_DIR = build
FENNEL = ./fennel-0.10.0-x86_64
fnl_files := $(shell find $(SRC_DIR)/ -type f -name '*.fnl')
lua_files := $(patsubst $(SRC_DIR)/%.fnl, $(BUILD_DIR)/%.lua, $(fnl_files))
.PHONY: install clean
all: $(lua_files)
install:
@echo "Leaving installation up to luarocks..."
$(BUILD_DIR)/%.lua: $(SRC_DIR)/%.fnl
mkdir -p "$(@D)"
$(FENNEL) --compile $< > $@
clean:
rm -rf $(BUILD_DIR)

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README.md Normal file
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# qrprinter
A wrapper for `libqrencode` that provides an easy way of encoding and printing strings as QR codes from Lua.
Written in [Fennel](https://fennel-lang.org).
## Installation
Install with [luarocks](https://luarocks.org):
```bash
luarocks install qrprinter
```
## Example Usage
![Example Usage](/assets/demo.png?raw=true)
## Documentation
### Encoding
#### qrprinter.encode_string
```
qrprinter.encode_string( string )
```
Encodes `string` into a table representing a QR code.
Returns a 2D 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.

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rockspec/qrprinter-1.0-0.rockspec Normal file
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package = 'qrprinter'
version = '1.0-0'
supported_platforms = {'linux'}
source = {
url = "git@gitlab.com:jessieh/qrprinter",
tag = "1.0-0"
}
description = {
summary = "Encode and print strings as QR codes.",
detailed = "qrprinter wraps the libqrencode C library to provide an easy way of encoding and printing strings as QR codes from Lua.",
homepage = "https://gitlab.com/jessieh/qrprinter",
maintainer = "Jessie Hildebrandt <jessieh@jessieh.net>",
license = "GPLv3"
}
dependencies = {
"lua >= 5.1",
}
external_dependencies = {
LIBQRENCODE = {
header = "qrencode.h"
}
}
build = {
type = "make",
makefile = "Makefile",
install = {
lua = {
["qrprinter"] = "build/qrprinter.lua",
["qrprinter.ffi.qrencode"] = "build/ffi/qrencode.lua"
}
}
}

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;; ffi/qrencode.fnl
;; Provides function wrappers for the libqrencode C library
;; -------------------------------------------------------------------------- ;;
;; License
;; Copyright (C) 2021 Jessie Hildebrandt
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;; -------------------------------------------------------------------------- ;;
;; Dependencies
(local ffi (require :ffi))
;; -------------------------------------------------------------------------- ;;
;; FFI libraries
;; ---------------------------------- ;;
;; C definitions
(ffi.cdef "
/* QR code object */
typedef struct {
int version;
int width;
unsigned char *data;
} QRcode;
/* QR code error correction level */
typedef enum {
QR_ECLEVEL_L = 0,
QR_ECLEVEL_M,
QR_ECLEVEL_Q,
QR_ECLEVEL_H
} QRecLevel;
/* Encode 8-bit string as QR code object */
QRcode* QRcode_encodeString8bit( const char *string, int version, QRecLevel level );
")
;; ---------------------------------- ;;
;; C libraries
(local ffi_qrencode (ffi.load :qrencode))
;; -------------------------------------------------------------------------- ;;
;; qrencode module
{
:encode_string_8_bit
(fn [string]
"Encode 8-bit string `string` into a table representing a QR code.
Wrapper for qrencode's QRcode_encodeString8bit.
Returns a 2D sequential table of true/false values representing black/white QR modules."
(let [qr_version 0
qrcode_table []
qrcode (ffi_qrencode.QRcode_encodeString8bit string qr_version :QR_ECLEVEL_L)]
(for [row 0 (- qrcode.width 1)]
(let [row_table []]
(for [column 0 (- qrcode.width 1)]
(let [module_index (+ (* row qrcode.width) column)
module_data (. qrcode.data module_index)
module_black? (= (% module_data 2) 1)]
(table.insert row_table module_black?)))
(table.insert qrcode_table row_table)))
qrcode_table))
}

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;; qrprinter.fnl
;; Provides utilities for encoding and printing strings as QR codes
;; -------------------------------------------------------------------------- ;;
;; License
;; Copyright (C) 2021 Jessie Hildebrandt
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;; -------------------------------------------------------------------------- ;;
;; Local modules
(local qrencode (require :qrprinter.ffi.qrencode))
;; -------------------------------------------------------------------------- ;;
;; Helper functions
;; ---------------------------------- ;;
;; Padding
(fn generate_sequence [element size]
"Return a sequential table of `element` with length `size`."
(let [row []]
(for [_ 1 size]
(table.insert row element))
row))
(fn pad_sequence [sequence element amount]
"Return a sequential table containing `sequence` padded with `amount` count of `element`."
(let [padded_sequence [(unpack sequence)]]
(for [_ 1 amount]
(table.insert padded_sequence 1 element)
(table.insert padded_sequence element))
padded_sequence))
(fn pad_qr [qr amount]
"Return 2D sequential table `qr` padded with `amount` count of white modules."
(let [blank_row (generate_sequence false (length qr))
padded_qr (pad_sequence qr blank_row amount)]
(icollect [_ row (ipairs padded_qr)]
(pad_sequence row false amount))))
;; ---------------------------------- ;;
;; Printing
(fn print_qr [qr black_cell white_cell ?options]
"Print 2D sequential table `qr` to stdout.
Black modules will be printed as `black_cell`, and white modules will be printed as `white_cell`.
`?options` is optional and may contain two keys:
- invert: If non-nil, the output colors will be inverted.
- padding: Amount of blank modules to print around QR code. If nil, defaults to 2."
(let [invert? (?. ?options :invert)
padding (or (?. ?options :padding) 2)
padded_qr (pad_qr qr padding)
[black_cell white_cell] (if invert? [white_cell black_cell] [black_cell white_cell])
row_strings (icollect [_ row (ipairs padded_qr)]
(accumulate [row_string ""
_ module_black? (ipairs row)]
(.. row_string (if module_black? black_cell white_cell))))]
(print (table.concat row_strings "\n"))))
;; -------------------------------------------------------------------------- ;;
;; Module functions
;; Some Fennel naming conventions are eschewed here because these are Lua-facing library functions
;; and the names would be mangled during compilation.
;; e.g. ?options -> _3foptions, invert? -> invert_3f
(fn encode_string [string]
"Encode string `string` into a table representing a QR code.
Returns a 2D sequential table of true/false values representing black/white QR modules."
(qrencode.encode_string_8_bit string))
(fn print_qr_ascii [qr options]
"Print QR code `qr` to stdout using ASCII characters."
(let [black_cell " "
white_cell "##"]
(print_qr qr black_cell white_cell options)))
(fn print_qr_ansi [qr options]
"Print QR code `qr` to stdout using ANSI escape sequences."
(let [black_cell "\27[40m \27[0m"
white_cell "\27[47m \27[0m"]
(print_qr qr black_cell white_cell options)))
(fn print_qr_utf8 [qr options]
"Print QR code `qr` to stdout using UTF8 block elements."
(let [black_cell " "
white_cell "██"]
(print_qr qr black_cell white_cell options)))
;; -------------------------------------------------------------------------- ;;
;; Provide qrprinter module
{: encode_string
: print_qr_ascii
: print_qr_ansi
: print_qr_utf8
:print_qr print_qr_ansi}